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Glossary of Terms

CATEGORY TERM DEFINITION
Fuse type11 TypeA cylindrical fiber tube fuse with threaded ends and ventilation slots designed for the telecom industry.
Fuse type1AGA glass body cartridge style fuse that is 1/4" in diameter and 5/8" in length.
Fuse type2.3 x 8mmA ceramic body axial leaded subminiature fuse that is 2.3mm in diameter and 8mm in length.
Fuse type24 TypeA 60 volt DC fuse designed for the telecom industry.
Fuse type2AGA Litttelfuse brand name for a glass body cartridge fuse that is 5mm in diameter and 15mm in length.
Fuse type3.6 x 10mmA ceramic body axial leaded subminiature fuse that is 3.6mm in diameter and 10mm in length.
Fuse type3ABA ceramic body cartridge style fuse that is 1/4" in diameter and 1-1/4" in length (6.3x32mm).
Fuse type3AGA glass body cartridge style fuse that is 1/4" in diameter and 1-1/4" in length (6.3x32mm).
Fuse type5 x 15mmA glass body cartridge fuse that is 5mm in diameter and 15mm in length .
Fuse type5 x 20mmA glass or ceramic body cartridge fuse that is 5mm in diameter and 20mm in length.
Fuse type5AGA cartridge fuse that is 13/32" in diameter and 1-1/2" in length (10x38mm).
Fuse type7 TypeA cylindrical fiber tube fuse with threaded ends designed for the telecom industry.
Fuse type70 TypeA cylindrical cartridge fuse with an indicator pin designed for the telecom industry.
Fuse type74 TypeA fast acting, 60 volt DC cylindrical body fuse designed for the telecom industry.
Fuse type75 TypeA radial leaded, cylindrical fuse designed for the telecom industry.
Fuse type76 TypeA radial leaded, cylindrical fuse designed for the telecom industry.
Fuse type7AGA glass body cartridge fuse that is 1/4" in diameter and 7/8" in length.
Fuse type80 TypeA fast acting, cylindrical body fuse designed for the telecom industry. It is visually indicating with remote electrical alarm capability.
Fuse type81 TypeA fast acting, cylindrical body, non-indicating fuse designed for the telecom industry.
Fuse type8AGA glass body cartridge style fuse that is 1/4" in diameter and 1" in length.
Fuse typeAlarm IndicatingA fast-acting telecom fuse designed to provide visual blown fuse indication by triggering an LED or an audio alarm.
Fuse typeBarrier NetworkA fuse designed to operate in potentially explosive environments. They are built in accordance with the Barrier Network Standards (EN50020) for hazardous applications.
Fuse typeBolt-inA fuse which is intended to be bolted directly to bus bars, contact pads or fuse blocks.
Fuse typeBranch CircuitA fuse that has a minimum interrrupting rating of 10,000 amps, a minimum voltge rating of 125 volts and a they must be size rejecting so that a fuse with a higher voltage rating cannot be installed in the circuit. They must also be size rejecting so that a fuse with a current rating higher than the current rating of the fuse holder rating caanot be installed.
Fuse typeCartridgeA fuse with a cylindrical body, a current responsive element and two cylindrical end caps or ferrules.
Fuse typeClass CCA branch circuit fuse having 600V, a 200kA interrupting rating and overall dimensions of 13/32” x 11/2”. Their design incorporates a rejection feature that allows them to be inserted into rejection fuse holders and fuse blocks that reject all lower voltage, lower interrupting rating 13/32” x 11/2” fuses. They are available from 1/10A through 30A.
Fuse typeClass GA branch circuit fuse having 480V, a 100kA interrupting rating and is size rejecting to eliminate overfusing. The fuse diameter is 13/32” while the length varies from 15/16” to 2-1/4”. These are available in ratings from 1A through 60A.
Fuse typeClass HA branch circuit fuse having either 250V or 600V, a 10kA interrupting rating that may be renewable or non-renewable. These are available in amp ratings of 1A through 600A.
Fuse typeClass JA 600VAC fuse rated to interrupt a minimum of 200kA. They are labeled as “Current-Limiting” and are not interchangeable with other classes.
Fuse typeClass K5A branch circuit fuse having either 250V or 600V, and a 50kA interrupting rating. These are dimensionally the same as Class H fuses. These fuses are current-limiting. However, they are not marked “current-limiting” on their label since they do not have a rejection feature.
Fuse typeClass LThese fuses are rated for 601 through 6000A, and are rated to interrupt a minimum of 200kA. They are labeled “Current-Limiting” and are rated for 600Vac. They are intended to be bolted into their mountings and are not normally used in clips. Some Class L fuses have designed in time-delay features for all purpose use.
Fuse typeClass-RThese are high performance fuses rated 1/10-600A in 250V and 600V ratings. All are marked “Current Limiting” on their label and all have a minimum of 200kA interrupting rating. They have identical outline dimensions with the Class H fuses but have a rejection feature which prevents the user from mounting a fuse of lesser capabilities (lower interrupting capacity) when used with special Class-R Clips. Class-R fuses will fit into either rejection or non-rejection clips.
Fuse typeClass RK1A fast acting or dual element time delay fuse. These are high performance fuses rated 1/10-600A in 250V and 600V ratings. All are marked “Current Limiting” on their label and all have a minimum of 200kA interrupting rating. Class RK1 fuses are more current limiting than Class RK5 fuses. They have identical outline dimensions with the Class H fuses but have a rejection feature which prevents the user from mounting a fuse of lesser capabilities (lower interrupting capacity) when used with special Class R Clips. Class R fuses will fit into either rejection or non-rejection clips.
Fuse typeClass RK5A dual element time delay fuse. These are high performance fuses rated 1/10-600A in 250V and 600V ratings. All are marked “Current Limiting” on their label and all have a minimum of 200kA interrupting rating. Class RK5 fuses are less current limiting than Class RK1 fuses. They have identical outline dimensions with the Class H fuses but have a rejection feature which prevents the user from mounting a fuse of lesser capabilities (lower interrupting capacity) when used with special Class R Clips. Class R fuses will fit into either rejection or non-rejection clips.
Fuse typeClass TAn industry class of fuses in 300V and 600V ratings from 1A through 1200A. They are physically very small and can be applied where space is at a premium. They are fast acting fuses with an interrupting rating of 200kA RMS.
Fuse typeCF8 BatteryA 58 volt DC ceramic automotive fuses that is designed to mount directly on the battery terminal with an associated hex nut.
Fuse typeCurrent LimitingA fuse which will limit both the magnitude and duration of current flow under short circuit conditions. Current-limiting fuses must have the following characteristics: 1. Limit peak currents to values less than those which would occur if the fuses were replaced with solid conductors of the same impedance. This reduced peak current is referred to as a fuse’s “Peak Let-through Current.” 2. When the fault current exceeds the fuse threshold current, the fuse must open the circuit in less than 180 electrical degrees (1/2 cycle) after the start of the fault. 3. Matching fuse holders and/or fuse blocks must reject non-current limiting fuses and accept only current-limiting fuses of the stated UL Class.
Fuse typeDual ElementA fuse with a special design that utilizes two individual elements in series inside the fuse tube. One element, the spring actuated trigger assembly, operates on overloads up to 5-6 times the fuse current rating. The other element, the short circuit section, operates on short circuits up to their interrupting rating.
Fuse typeEdison Base PlugA 125 volt AC branch circuit rated fuses that is designed to screw in to a socket. The Edison Base style has brass threads and a ceramic body
Fuse typeElectronic fuseAn overcurrent protective device with a fusible link which melts and permanently opens the circuit under an overcurrent condition. An electronic fuse is typically used in circuit board applications where circuit voltage are at below 300 Volts. It includes cartridge fuses, axial leaded fuses, radial leaded fuses and surface mount fuses.
Fuse typeFast ActingA fuse which opens on overload and short circuits very quickly. This type of fuse is not designed to withstand temporary overload currents associated with some electrical loads. UL listed or recognized fast acting fuses would typically open within 5 seconds maximum when subjected to 200% to 250% of its rated current. IEC has two categories of fast acting fuses: · F = quick acting, opens 10x rated current within 0.001 seconds to 0.01 seconds. · FF = very quickly acting, opens 10x rated current in less than 0.001 seconds.
Fuse typeFork LiftA DC rated fuse designed for battery operated lift trucks and other low voltage battery operated equipment.
Fuse typeFuse~An overcurrent protective device with a fusible link which melts and permanently opens the circuit under an overcurrent condition. Designed as an intentional weak link in an electrical circuit.
Fuse typeFuse ClassThe industry has developed basic physical specifications and electrical performance requirements for fuses with voltage ratings of 600V or less. These are known as standards. If a type of fuse meets the requirements of a standard, it can fall into that class. Typical classes are K, RK1, RK5, G, L, H, T, CC, and J.
Fuse typeHigh Reliabilty (Hi Rel)A special category of electronic fuses designed for use in aircraft, space and military application where reliability is critical. High-Rel fuses are subjected to a series or endurance and environmental tests during production.
Fuse typeHigh SpeedAlso known as a Semiconductor Fuse or a Rectifier Fuse. An extemely fast acting fuse used to protect solid-state devices. It has no intentional time-delay in the overload range and is designed to open as quickly as possible in the short-circuit range.
Fuse typeHigh Speed JA very fast acting, current limiting Class J fuse the offers the low I²t values of a semiconductor fuse.
Fuse typeIn LineA glass body, 300 volt AC rated fuse that is designed to protect flourescent lighting fixtures.
Fuse typeIndicatingA fuse with a visual or trigger feature that allows for easy identification of a blown fuse.
Fuse typeLimiterA special purpose fuse which is intended to provide short circuit protection only.
Fuse typeLimiter FuseA special purpose fuse that provides short circuit protection only. Also known as a Back-Up Fuse.
Fuse typeLow Voltage FuseA fuse rated at 600v or less. Many types of low voltage fuses are classified and identified for use in 125, 250, 300, 480, or 600V circuits. UC/CSA/NOM standards are followed.
Fuse typeMedium Voltage FuseCurrent limiting power fuses having voltage ratings from 0.6kV to 34.38kV. Continuous current ratings range from 0.5 to 1,200 amps. E-rated medium voltage fuses are general purpose fuses that are primarily used to protect transformers and provide both current overload and short circuit protection. R-Rated fuses are back-up fuses primarily used to protect motors and motor controllers. They only provide short circuit protection. Other medium voltage fuses are designed to protect potential transformers, capacitors and distribution transformers. Medium Voltage fuses are designed in accordance with the American National Standards Institute (ANSI). Back-up fuses designed in accordance with IEC Standards are also available.
Fuse typeMicroA radial leaded subminature electronic fuse offered in either a cylindrical or rectangular body.
Fuse typeMidget fuseA fuse with a voltage rating between 250 and 600 volts and overall dimensions of 13/32” x 1-1/2”. Also known as a 5AG fuse.
Fuse typeMiniature FuseA cartridge electronic fuse commonly available in the 3AG/3AG or 5 x 20mm dimensions.
Fuse typeMulti-MeterA 1,000 volt AC/DC midget size fuse designed to protect both analog and digital multi-meters.
Fuse typeOne Time FuseA generic term used to describe a Class H non-renewable cartridge fuse with a single element.
Fuse typePicoAn axial leaded subminature electronic fuse.
Fuse typePlugA 125 volt AC branch circuit rated fuse that interrupts a minimum of 10,000 amps. Plug fuses are designed to screw into a socket.
Fuse typePower FuseA fuse with a voltage rating between 250 and 600 volts and overall dimensions larger than 13/32” x 1-1/2”.
Fuse typeQuick ActingA fast acting fuse under the IEC 60127 Standard.
Fuse typeRectifierAlso known as a High Speed Fuse or a Semiconductor Fuse. An extemely fast acting fuse used to protect solid-state devices. It has no intentional time-delay in the overload range and is designed to open as quickly as possible in the short-circuit range.
Fuse typeRejection Base PlugA 125 volt AC branch circuit rated fuses that is designed to screw in to a socket. The Rejection Base style has a ceramic base with rejection threads.
Fuse typeRejection FuseA current-limiting fuse with high interrupting rating and with unique dimensions or mounting provisions.
Fuse typeRenewable FuseA fuse rated at 600V or below in which the element may be replaced after the fuse has opened and then reused. Renewable fuses are made to Class H standards.
Fuse typeSafe-T-PlusLittelfuse brand name for a hermetically sealed, encapsulated fuse designed to operate in potentially explosive environments.
Fuse typeSemiconductor FuseAlso known as a High Speed Fuse or a Rectifier Fuse. An extemely fast acting fuse used to protect solid-state devices. It has no intentional time-delay in the overload range and is designed to open as quickly as possible in the short-circuit range.
Fuse typeSFEA fast-acting low voltage glass body cartridge fuse. The SFE fuse has a 1/4" diameter. The length varies by amperage rating from 5/8' to 1-7/16".
Fuse typeSmall Dimension FuseTypically a fuse with a voltage rating of 300V or below designed for circuit board applications.
Fuse typeSolar JA 600 volt AC, 1,000 volt DC fuse designed specifically for the protection of photovoltaic (PV) systems. The Solar J fuse is offerred in the blade style Class J case sizes.
Fuse typeSolar FuseA fuse designed specifically for the protection of photovoltaic (PV) systems.
Fuse typeSolar MidgetA 1,000 volt DC fuse designed specifically for the protection of photovoltaic (PV) systems. The Solar Midget fuse is offerred in 10 x 38mm case sizes.
Fuse typeSolar RA 600 volt AC, 600 volt DC fuse designed specifically for the protection of photovoltaic (PV) systems. The Solar R fuse is offerred in Class R case sizes.
Fuse typeSubminiature FuseFuses having dimensions that are smaller than the miniature (3AG/3AB or 5 x 20mm) fuses. Subminature fuses include the 3.6x10mm, 2.3x8mm, Micro, Pico and Surface Mount type fuses.
Fuse typeSupplemental FusesFuses that can have many voltages and interrupting ratings within the same case size. Supplemental fuses can have sizes of 13/32" x1-1/2", 1/4" x 1-1/4" and 5 x 20mm. Interrupting ratings range from 35 to 100,000 amps.
Fuse typeSurface Mount FuseA fuse constructed in a way that alows it to be soldered directly to the surface of a printed circuit board. This eliminates the through hole device requitement to drill holes in the board to solder the leads. It also saves considerable space by utilizing only one side of the board. Surface mount fuses can be made smaller than their throughhole counterpart.
Fuse typeTelepowerA DC rated power fuse designed for the telecom industry.
Fuse typeTelpowerBussmann brand name for a broad range of telcom industry specific fuses.
Fuse typeThin FilmA type of surface mount fuse construction where a microscopically thin layer of conductive metal is deposited on a ceramic or glass substrate between the fuse terminals. This metal layer serves as the fuse's melting element. This construction method allows extremely small fuses (ie. 0.04" x 0.02") to be manufactured.
Fuse typeThrough Hole Mount FuseA fuse constructed with leads that are soldered to the back side of the printed circuit board. Installation of a through hole fuse requites drilling holes in the printed circuit board, inserting the leads in the holes and soldering the leads on the back side of the board.
Fuse typeTime DelayA built-in delay that allows temporary and harmless inrush currents to pass the fuse or circuit breaker without operating, but is so designed to open on sustained overloads and short circuits.
Fuse typeTime LagA time delay fuse under the IEC 60127 Standard.
Fuse typeTorpedoA torpedo fuse consists of a heat resistant body with the fuse element stretched over the exterior body of the fuse. This type of fuse was used in older model cars made in Europe.
Fuse typeVery Fast-ActingVery fast-acting fuses are designed for very fast response to overloads and short-circuits. They are very current-limiting. The primary use is to protect solid state electronic components.Their special characteristics, including quick overload response, very low I²t, Ipeak and peak transient voltages, provide protection for components that cannot withstand line surges, low value overloads, or short-circuit currents.
Fuse typeWER TypeA 32 volt DC fuse designed for the telecom industry.
Fuse typeE-Rated FuseCurrent limiting medium voltage power fuses that provide overload and short circuit protection. They are designed to withstand the large magnetizing inrush that occurs during transformer start-up. Voltage ratings range from 2.75kV to 38kV and continuous current ratings from 5E to 450E amps. Interrupting ratings range from 50 to 65 kA. E-Rated fuse are UL Listed and operated per ANSI C37.46-2000. Current ratings of 100E amps or less must melt in 300 seconds at 200 to 240% of the E (ampere) rating. Fuses with current ratings over 100E amps must melt in 600 seconds at 220 to 264% of the E (ampere) rating.
Fuse typeR-Rated FuseR-Rated fuses are current limiting back-up fuses which are designed to provide short circuit protection only for medium voltage starters and motors. They are not designed to protect against long term current overloads. R-rated fuses must be applied in series with other devices such as motor overload relays to provide the overload protection for the circuit. An R-rated fuse will safely interrupt any current between its minimum interrupting rating and its maximum interrupting rating. R-Rated fuses follow ANSI and UL Standards.
Fuse typePT FuseA Potential Transformer (PT) fuse is a special purpose fuse designed to protect Potential Transformers. Potential Transformers require current limiting fuses on the primary connection side. Voltage ratings range from 2.4kV to 36 kV. Since the power requirements are low for relays, meters, etc., PT fuses have current ratings ranging from 1/2 to 5 amps. Physical sizes may vary among manufacturers.
Fuse typeCapacitor FuseCapacitor fuses are current limiting with high interrupting ratings and provide both short circuit and overload protection. A capacitor fuse is designed to isolate a shorted capacitor before the capacitor can damage surrounding equipment or personnel. They are designed to protect against capacitor case rupture or dielectric failure within the capacitor. They can be used indoors in a general purpose enclosure or outdoors in a weatherproof enclosure. Capacitor fuses are non-disconnecting and require the use of a disconnect switch. They are designed in accordance with ANSI C37-41.
Fuse typeDistribution Transformer FuseDistribution Transformer Fuses are back-up current limiting fuses designed to protect distribution transformers. A back-up current limiting fuse is a fuse that can interrupt any current between its rated minimum interrupting current and its maximum interrupting current. Back-up fuses are not designed to open under overload conditions. They are used in series with another protective devise such as an expulsion fuse.
Fuse typeIEC Standard Back-Up FuseIEC Standard Fuses are medium voltage back-up fuse links made in accordance with IEC Standards. Back-up fuse links have a rated minimum breaking capacity (below I3). Their operating range is between their minimum interrupting rating (I3) and their maximum interrupting rating (I1). If protection is required below I3, additional protection is required. These fuses conform to IEC 60-28201 which is identical to German standard VDE 0670T4. Fuses that conform to DIN 43 625 are also available.
Fuse typeGeneral Purpose FuseA current limiting medium voltage fuse capable of interrupting all currents from the maximum rated interrupting current down to the current that causes melting of the fusible element in one hour. Not all currents fall within this range. It is possible to receive an overcurrent lower than the value given by this one hour criterion.
Fuse typeFull Range FuseA current limiting medium voltage fuse capable of interrupting all currents from the maximum rated interrupting current down to the minimum continuous current that causes melting of the fusible element(s) when the fuse is applied at the maximum ambient temperature specified by the manufacturer. This type of fuse is able to interrupt any normal 60 cycle current that will melt its element.
Fuse typeBack Up FuseA special purpose current limiting fuse that provides short circuit protection only. They are used in conjunction with high voltage motor starters to provide short circuit protection for individual motors. An example would be R-rated fuses that are designed to withstand frequent severe heating and cooling cycles associated with motor starting duties without fatigue failures and are always used in a series with another interrupting device capable of interrupting currents below the fuse’s minimum interrupting current. Also known as a Limiter Fuse.
Fuse typeClass RThese are high performance fuses rated 1/10-600A in 250V and 600V ratings. All are marked “Current Limiting” on their label and all have a minimum of 200kA interrupting rating. They have identical outline dimensions with the Class H fuses but have a rejection feature which prevents the user from mounting a fuse of lesser capabilities (lower interrupting capacity) when used with special Class R Clips. Class R fuses will fit into either rejection or non-rejection clips.
PTC TypePTC DeviceA resettable overcurrent protection device that is made with a polymer that reponds rapidly to a rise in temperature. Under normal conditions, the PTC Device has very little resistance and has little influence on the circuit. The PTC Device changes or trips from a low resistance state to a high resistance state in response to an overcurrent situation. In its tripped state, there is a sharp increase in the resistance of the PTC element and the current is reduced to a safe level. After the overcurrent state passes, the device cools and returns or resets to its normal, low resistance state.
PTC TypePTC Resettable FuseAnother name for a PTC Device. PPTC stands for Polymer Positive Temperature Coefficent.
PTC TypePPTC DeviceAnother name for a PTC Device. PTC stands for Positive Temperature Coefficent.
PTC TypeBattery Strap PTCAn axial leaded PTC Device that provides non-cycling protection against overcharging and short circuit events for rechargeable battery cells
Varistor TypeMOVAA voltage sensitive device designed to protect circuits from transient voltage surges. MOV's are designed to suppress lighning and other high energy transients found in industrial or AC line applications. MOV's are constructed with a zinc oxide disc, metal elements and radial leads encapsulated in epoxy. Higher energy MOV's have rigid terminals and are housed in an epoxy polymer case that provides electrial isolation.
Varistor TypeMLVA voltage sensitive surface mount device designed to protect circuits from transient voltage surges generated from Electrostatic Discharge (ESD), inductive load switching or lightning surge remnants. MLV's are constructed with a zinc oxide material interweaved with layers of metal electrodes enclosed in a leadless ceramic package.
Reed Switch TypeReed SwitchA reed switch is an electrical switch operated by an applied magnetic field. The basic reed switch is comprised of two ferromagnetic nickel-iron wires and a hermetically sealed glass capsule. The two wires are formed into ‘reeds’ by flattening one end. The reeds are aligned with a small overlap and then sealed in a glass capsule. The reed switch is activated by an electromagnetic coil or by bringing a magnet close to the reed switch. Magnetism attracts the reeds. Once the magnet is pulled away from the switch, the reed switch returns to its original open-circuit position.
Reed Sensor TypeFirecrackerA reed sensor packaged in a slim, cylindrical form. It is best suited for mounting on a frame.
Reed Sensor TypeFlangeA reed sensor designed with a rectangular package for mounting on a flat surface. Hall Effect sensors also come in the Flange type package.
Reed Sensor TypeFloatA reed sensor designed for liquid-level sensing applications.
Reed Sensor TypeLever ArmA reed sensor designed with a clip mounting frame and a lever arm. It is well suited for paper path sensing and security sytem applications.
Reed Sensor TypePCB MountA reed sensor designed for mounting on a printed circuit board.
Reed Sensor TypeSeating OccupancyA reed sensor packaged with an intergral magnet and a reed switch. Available in push-button or dome configurations for weight/load distribution.
Reed Sensor TypeThreaded BarrelA reed sensor designed with a cylindrical package. It is easily mounted and adjusted using the supplied retaining nuts. Available with English or metric threads. Hall Effect sensors also come in the Threaded Barrel typ package.
Reed Sensor TypeVaneA reed sensor packaged with a magnet and a reed switch. It is typically used with a moving ferrous metal part. Hall Effect sensors also come in the Vane type package.
Reed Sensor TypeHall Effect SensorA Hall effect sensor is a transducer that varies its output voltage in response to changes inthe magnetic field.  Hall effect sensors are used for proximity switching, positioning, speed detection, and current sensing applications.  Hall effect sensors can ultimately perform a similar function as a reed switch, but with no moving parts.  A Hall sensor is combined with circuitry that allows the device to act in a digital (on/off) mode, and may be called a switch in this configuration.
Reed Relay TypeReed RelayA reed relay is made by combining a reed switch with a copper coil. Like other relays, this provides galvanic isolation between the coil input and the controlled contact(s). However, because of the small size and magnetic efficiency of the reed switch, the power required to drive the coil is lower than most other types of relays. Other advantages include high insulation resistance, low contact resistance and long contact life. Reed relays are used in many applications, including automotive, test equipment, security, medical and process control equipment.
SMT Package Size1206 Size PackageAn industry standard surface mount package that is 0.12" in length and 0.06" in width (3.2 x 1.6mm).
SMT Package Size1210 Size PackageAn industry standard surface mount package that is 0.12" in length and 0.10" in width.
SMT Package Size1812 Size PackageAn industry standard surface mount package that is 0.18" in length and 0.12" in width.
SMT Package Size0402 Size PackageAn industry standard surface mount package that is 0.04" in length and 0.02" in width.
SMT Package Size0603 Size PackageAn industry standard surface mount package that is 0.06" in leght and 0.03" in width.
SMT Package Size0805 Size PackageAn industry standard surface mount package that is 0.08" in leght and 0.05" in width.
TVS Diode Package SizeDO-214AAAn industry standard surface mount package that is 4.57mm in length by 3.94mm in width (max).
TVS Diode Package SizeDO-214ABAn industry standard surface mount package that is 7.11mm in length by 6.22mm in width (max).
TVS Diode Package SizeDO-214ACAn industry standard surface mount package that is 4.50mm in length by 2.79mm in width (max).
TVS Diode Package SizeDO-221ACAn industry standard surface mount package that is 4.60mm in length by 2.95mm in width (max).
TVS Diode Package SizeSOD-123FAn industry standard surface mount package that is 2.90mm in length by 2.00mm in width (max).
TVS Diode Package SizeDO-15An industry standard axial leaded package where the device body is 7.60mm in length by 3.60mm in width (max).
TVS Diode Package SizeDO-41An industry standard axial leaded package where the device body is 5.20mm in length by 2.70mm in width (max).
TVS Diode Package SizeDO-201An industry standard axial leaded package where the device body is 9.50mm in length by 5.30mm in width (max).
TVS Diode Package SizeP600An industry standard axial leaded package where the device body is 9.10mm in length by 9.10mm in width (max).
Thyristor Package SizeSOD 80 (MiniMelf)An industry standard surface mount package that is 3.61mm in length by 1.78mm in width (max).
Thyristor Package SizeDO-35An industry standard axial-leaded package that is 4.19mm in length by 2.28mm in width (max).
Thyristor Package SizeDO214An industry standard surface mount package that is 5.60mm in length by 3.95mm in width (max).
Thyristor Package SizeDO214 3L (Compak; Modified DO-214AA)An industry standard surface mount package that is 5.60mm in length by 3.95mm in width (max).
Thyristor Package SizeSOT 89An industry standard surface mount package that is 4.60mm in length by 2.60mm in width (max).
Thyristor Package SizeSOT 223An industry standard surface mount package that is 6.70mm in length by 3.70mm in width (max).
Thyristor Package SizeTO 3 (Fastpak)An industry standard surface mount package that is 39.2mm in length by 23.0mm in width (max). Tabs for use with cable connections.
Thyristor Package SizeTO 252 (D-Pak)An industry standard surface mount package that is 7.31mm in length by 6.73mm in width (max).
Thyristor Package SizeTO 263 (D2- Pak)An industry standard surface mount package that is 10.67mm in length by 10.54mm in width (max).
Thyristor Package SizeTO 92An industry standard radial leaded package where the device body is 4.98mm in length by 4.73mm in width (max).
Thyristor Package SizeTO 92WBAn industry standard radial leaded package where the device body is 4.98mm in length by 4.73mm in width (max). WB=Wire Bonded.
Thyristor Package SizeTO 218An industry standard radial leaded package where the device body is 21.21mm in length by 16.0mm in width (max). Non-isolated mounting tab.
Thyristor Package SizeTO 218 IsoAn industry standard radial leaded package where the device body is 21.21mm in length by 16.0mm in width (max). Isolated mounting tab.
Thyristor Package SizeTO218XAn industry standard radial leaded package where the device body is 21.21mm in length by 16.0mm in width (max). Non-isolated mounting tab.
Thyristor Package SizeTO 218X IsoAn industry standard radial leaded package where the device body is 21.21mm in length by 16.0mm in width (max). Isolated mounting tab.
Thyristor Package SizeTO 220An industry standard radial leaded package where the device body is 16.30mm in length by 10.67mm in width (max). Non-isolated mounting tab.
Thyristor Package SizeTO 220 IsoAn industry standard radial leaded package where the device body is 16.65mm in length by 10.67mm in width (max). Isolated mounting tab.
Thyristor Package SizeTO 220 Non-IsoAn industry standard radial leaded package where the device body is 16.30mm in length by 10.67mm in width (max). Non-isolated mounting tab.
Thyristor Package SizeTO 251 (V-Pak)An industry standard radial leaded package where the device body is 7.49mm in length by 6.73mm in width (max).
Brand NameAmp-TrapMersen brand name for several classes of their fuses.
Brand NameAmp-Trap 2000Mersen brand name given to their fuses having the highest degree of current limitation in the Mersen line.
Brand NameATCBussmann brand name for a specific type of automotive blade fuse.
Brand NameATM Mini-FuseBussmann brand name for a mini automotive blade fuse.
Brand NameATOLittelfuse brand name for a specific type of automotive blade fuse.
Brand NameFKS ATOLittelfuse brand name for a specific type of automotive blade fuse.
Brand NameTAC ATOLittelfuse brand name for a specific type of automotive blade fuse.
Brand NameTF ATOLittelfuse brand name for a specific type of automotive blade fuse.
Brand NameATOFLittelfuse brand name for a specific type of automotive blade fuse.
Brand NameBFLittelfuse brand name for an inline crimp on cable fuse.
Brand NameBF1Littelfuse brand name for a 32 volt shunt.
Brand NameBrickBussmann brand name for a type of board level surface mount fuse.
Brand NameCableProLittelfuse brand name for an inline fuse assembly used to protect cables.
Brand NameCC-TronBussmann brand name for a specific type of UL Class CC time delay fuse.
Brand NameCF8Littelfuse brand name for a specific fuse designed for use on the terminals of automotive style batteries.
Brand NameChipBussmann brand name for a type of board level surface mount fuse.
Brand NameCUBEFuseBussmann trade name for a dual element, time delay, finger safe fuse that meets the Class J performance requirements. Offers space saving advantages over typical Class J fuses.
Brand NameDura-LagBussmann brand name for a specific type of UL Class RK5 dual element time delay fuse.
Brand NameFLAT-PAKLittelfuse brand name for a first generation surface mount fuse.
Brand NameFusetronBussmann brand name for a specific type of UL Class RK5 dual element time delay fuse.
Brand NameFustatBussmann brand name for a dual element, time delay plug style fuse.
Brand NameIndicatorLittelfuse brand name for a broad range of fuses featuring blown fuse indication.
Brand NameLow Profile JCASE®Littelfuse brand name for a specific type of low profile cartridge fuse with female terminals designed for automotive applications.
Brand NameJCASELittelfuse brand name for a specific type of cartridge fuse with female terminals designed for automotive applications.
Brand NameLimitronBussmann brand name for a power fuse that can only provide short circuit protection.
Brand NameLow Profile~Littelfuse brand name for fuses featuring a low profile design.
Brand NameLow-PeakBussmann brand name for a current limiting fuse.
Brand NameMAX Maxi-FuseBussmann brand name for a maxi automotive blade fuse
Brand NameMAXILittelfuse brand name for a larger automotive blade style fuse designed to carry higher currents.
Brand NameFK3 MAXILittelfuse brand name for a larger automotive blade style fuse designed to carry higher currents and having a clear window for blown fuse detection.
Brand NameTOE MAXILittelfuse brand name for a larger automotive blade style fuse designed to carry higher currents at 58 VDC and having a clear window for blown fuse detection.
Brand NameMEGALittelfuse brand name for a bolt down automotive fuse for higher ampere applications.
Brand NameMicrotronBussmann brand name for a specific type of axial leaded board level fuse.
Brand NameMIDILittelfuse brand name for a type of automotive bolt-on fuses rated for 32 and 58 VDC high current wiring protection.
Brand NameLow-Profile MINILittelfuse brand name for a lower profile type of mini automotive blade fuses.
Brand NameMINILittelfuse brand name for a mini automotive blade fuse.
Brand NameFK1 MINILittelfuse brand name for a PCB mount mini automotive blade style fuse.
Brand NameFP1 MINILittelfuse brand name for a mini automotive blade fuse with a clear cover for circuit board applications.
Brand NameFUN MINILittelfuse brand name for a mini automotive blade fuse rated at 125 VDC.
Brand NameNANO2Littelfuse brand name for a series of square body, ceramic, surface mount fuses.
Brand NameOMNI-BLOKLittelfuse brand name for a surface mount fuse and fuse block combination that can be installed on a PC board in a single step. Allows for easy replacement of the fuse.
Brand NamePC-TronBussmann brand name for a specific type of radial leaded board level fuse.
Brand NamePICOLittelfuse brand name for an axial leaded white thermoplastic subminiature fuse with a clear insulating sleeve.
Brand NamePICO IILittelfuse brand name for an axial leaded,encapsulated, epoxy-coated, subminiature fuse.
Brand NamePOWR-PROLittelfuse brand name for a group of fuses with a high degree of current limitation.
Brand NamePOWR-TLittelfuse brand name for a UL Class T fuse.
Brand NameSlimlineLittelfuse brand name for a low profile ceramic surface mount fuse.
Brand NameSlo-BloLittelfuse brand name for a time delay or time lag electronic fuse.
Brand NameSmartSpotMersen brand name for an indicating type of industrial fuse.
Brand NameSurge3Bussmann brand name for their line of transient voltage surge protection products.
Brand NameTCPBussman brand name for a surge resistant time delay surface mount fuse designed specifically for the telecommunications industry . TCP stands for Telecom Circuit Protector.
Brand NameTE3Littelfuse brand name for a series of 125 volt rectangular body subminiature micro fuses.
Brand NameTE5Littelfuse brand name for a series of 125 volt or higher, rectangular body subminiature micro fuses.
Brand NameTeleLinkLittelfuse brand name for a surge resistant time delay surface mount fuse designed specifically for the telecommunications industry (Series 461).
Brand NameTR3Littelfuse brand name for a series of 250 volt cylindrical body subminiature micro fuses.
Brand NameTR5Littelfuse brand name for a series of 250 volt or higher, cylindrical body subminiature micro fuses.
Brand NameTri-OnicMersen brand name for a UL Class RK5 current limiting, time delay fuse.
Brand NameTronBussmann brand name for a specific type of plug fuse.
Brand NameT-TronBussmann brand name for a UL Class T fuse.
Brand NameAUMOVLittelfuse brand name for a low voltage radial leaded MOV designed for automotive applications.
Brand NameSurge ArrayLittelfuse brand name for a quad array MLV that provides four MLV's in a single package.
Brand NameTMOVLittelfuse brand name for a thermally protected MOV.
Brand NameiTMOVLittelfuse brand name for a thermally protected MOV that also provides open circuit indication.
Brand NameTMOV25SLittelfuse brand name for a 25mm square, thermally protected MOV designed for specific AC line operating voltages per UL 1449.
Brand NameTMOV34SLittelfuse brand name for a 34mm square, thermally protected MOV designed for specific AC line operating voltages per UL 1449.
Brand NameTPMOVMersen brand name for a thermally protected MOV that also provides open circuit indication.
Brand NameUltraMOVLittelfuse brand name for an MOV designed for AC line voltage applications with high peak surge current ratings and high energy absorption requirements.
Brand NameULtraMOV25SLittelfuse brand name for a 25mm square radial leaded MOV designed for AC line voltage applications with high peak surge current ratings and high energy absorption requirements.
Brand NameLV Ultra MOVLittelfuse brand name for a radial lead MOV designed forlow voltage DC applications
Brand NameAUMOVTMLittelfuse brand name for a low voltage radial leaded MOV designed for automotive applications.
Brand NameVisi-RockerCarling brand name for a two color rocker actuator for circuit breakers that offer front panel operation and visual indication of the ON or TRIPPED/OFF mode.
Brand NameRockerguardCarling name for a barrier feature designed to protect a rocker actuator.
Brand NamePolyfuse®A brand name for a PTC Device manufactured by Littelfuse
Brand NamePolyswitch®A brand name for a PTC Device manufactured by Raychem
Brand NameMultifuse®A brand name for a PTC Device manufactured by Bourns
Electrical Term - FuseA.I.C. (AIC)The interrupting capacity of a fuse. A.I.C. stands for Ampere Interrupting Capacity.
Electrical Term - FuseA.I.R. (AIR)The interrupting rating of a fuse. A.I.R. stands for Ampere Interrupting Rating.
Electrical Term - FuseAmbient TemperatureAmbient temperature is the temperature of the air immediately surrounding the fuse and is not necessarily room temperature. All electrical characteristics of a fuse are rated and validated at an ambient temperature of 25°C. Both higher and lower ambient temperatures will affect the fuse’s opening and current carrying characteristics.
Electrical Term - FuseAmp RatingAlso known as the current rating. The current carrying capacity of a fuse. A fuse ampere rating is the AC or DC current that the fuse can continuously carry under specified conditions. When a fuse is subjected to a current above its amp rating, it will open the circuit after a predetermined period of time.
Electrical Term - FuseAmp Squared Seconds (I2t)The measure of heat energy developed within a circuit during the fuse’s clearing. It can be expressed as “melting l²t “arcing I²t” or the sum of them as “Clearing I²t”. “l” stands for effective let-through current (RMS), which is squared, and “t” stands for time of opening, in seconds.
Electrical Term - FuseArcingArcing at the point of fault melts and vaporizes the conductors and components involved in the fault. The arcs often burn through raceways and equipment enclosures showering the area with molten metal that quickly starts fires and/or injures personnel in the area. Additional short-circuits are often created when vaporized material is deposited on insulators and other surfaces. Sustained arcing-faults vaporize organic insulation. These vapors may explode or burn.
Electrical Term - FuseArcing I²tValue of the I²t during the arcing time under specified conditions.
Electrical Term - FuseArcing TimeThe amount of time from the instant the fuse link has melted until the overcurrent is interrupted, or cleared.
Electrical Term - FuseAxial LeadA wire lead, terminal or pin extending from each end of a fuse's major axis.
Electrical Term - FuseBreaking CapacityAlso known as Interrupting Rating or Interrupting Capacity. The maximum current a fuse can safely interrupt. It is the rating which defines a fuse’s ability to safely interrupt and clear short circuits. A fuse must interrupt all overcurrents up to its breaking capacity. This rating is much greater than the ampere rating of a fuse.
Electrical Term - FuseClearing TimeThe total time between the beginning of the overcurrent and the final opening of the circuit at rated voltage by an overcurrent protective device. Clearing time is the total of the melting time and the arcing time.
Electrical Term - FuseCold ReistanceThe fuse resistance measured using a test current of no more than 10% of the fuse's nominal rated current. This parameter is an excellent predictor fuse quality level when measured on a production line.
Electrical Term - FuseContactsThe external live parts of the fuse which provide continuity between the fuse and the balance of the circuit. Also referred to as ferrules, blades or terminals.
Electrical Term - FuseCurrent LimitationA fuse operation relating to short circuits only. When a fuse operates in its current-limiting range, it will clear a short circuit in less than 1/2 cycle. Also, it will limit the instantaneous peak let-through current to a value substantially less than that obtainable in the same circuit if that fuse were replaced with a solid conductor of equal impedance.
Electrical Term - FuseCurrent RatingAlso known as the amp rating. The current carrying capacity of a fuse. A fuse current rating is the AC or DC current that the fuse can continuously carry under specified conditions. When a fuse is subjected to a current above its amp rating, it will open the circuit after a predetermined period of time.
Electrical Term - FuseCurrent-limiting RangeThe available fault currents a fuse will clear in less than ½ cycle, thus limiting the actual magnitude of current flow.
Electrical Term - FuseDerating of the Fuse Rated CurrentHigher ambient temperatures mean additional loading on a fuse element. Since technical data is presented based on a standard ambient temperature, either forced air cooling or de-rating of a fuse may be necessary to ensure reliable operation in a higher ambient environment. Derating is the process of selecting a fuse with a higher rated current to allow for its operation in an ambient environment above the standard ambient temperature.
Electrical Term - FuseFuse ElementAlso known as a link. A calibrated conductor inside a fuse which melts when subjected to excessive current. The element is enclosed by the fuse body and may be surrounded by an arc-quenching medium such as silica sand.
Electrical Term - FuseFuse PurposeFuse links protect electrical devices and components from overcurrents and short circuits. This is achieved automatically by the melting of a fuse wire through which a fault current flows. An irreversible, physical separation is created thereby cutting off current flow through that conductor. Fuse links are rated so as to reliably interrupt current flow when it reaches a predictable magnitude for a fixed duration. For all practical purposes, a fuse is invisible to the circuit. An optimum matching of fuse characteristics to the protective requirements of any device is important to provide both adequate protection of the end-user and maximum utilization of other circuit components. In order to minimize consequential damage and to comply with the requirements and standards of modern electro technology, we have compiled in the following paragraphs essential selection and application criteria for electronic fuses.
Electrical Term - FuseInterrupting CapacityAlso known as Breaking Capacity or Interrupting Rating. The maximum current a fuse can safely interrupt. It is the rating which defines a fuse’s ability to safely interrupt and clear short circuits. A fuse must interrupt all overcurrents up to its interrupting capacity. This rating is much greater than the ampere rating of a fuse.
Electrical Term - FuseInterrupting RatingAlso known as Breaking Capacity or Interrupting Capacity. The maximum current a fuse or circuit breaker can safely interrupt. It is the rating which defines a device’s ability to safely interrupt and clear short circuits. A circuit protection device must interrupt all overcurrents up to its interrupting rating.
Electrical Term - FuseLink~Also known as an element. A calibrated conductor inside a fuse which melts when subjected to excessive current. The link is enclosed by the fuse body and may be surrounded by an arc-quenching medium such as silica sand.
Electrical Term - FuseMelting I²tAlso known as the Melting Integral. The measure of the melting energy (I²t) during the melting time of the fuse link under specified fault conditions.
Electrical Term - FuseMelting Integral (I²t)Also known as the Melting I²t. The measure of the melting energy (I²t) during the melting time of the fuse link under specified fault conditions.
Electrical Term - FuseMelting TimeThe amount of time required to melt the fuse link during a specified overcurrent condition.
Electrical Term - FuseNormal Operating CurrentThe current that passes through the fuse during steady state conditions. The the level of current drawn (in RMS or dc amperes) after it has been energized and is operating under normal conditions. An operating current of 80% or less of rated current is recommended for operation at 25°C to avoid nuisance openings. For example, a fuse with a current rating of 1A is usually not recommended in circuits with normal operating currents of more than 800mA. Further derating is required at elevated ambient temperatures.
Electrical Term - FusePeak Let-Through CurrentThe instantaneous value of peak current let-through by a current-limiting fuse, when it operates in its current-limiting range.
Electrical Term - FusePulse Cycle Withstand CapacityThe measure of a fuse's ability to withstand a series of defined current pulses without opening prematurely. The pulse waveform and quantity is defined by the equipment application. This parameter, along with the fuse melting integral, is used to properly select a fuse for use over the lifetime of the equipment its protecting.
Electrical Term - FuseRadial LeadTwo wire leads, terminals or pins in parallel extending from the bottom of a fuse body.
Electrical Term - FuseRenewable ElementThe field-replaceable element of a renewable fuse. Also referred to as a renewable link.
Electrical Term - FuseRenewable LinkThe field-replaceable element of a renewable fuse. Also referred to as a renewable element.
Electrical Term - FuseSupplemental ProtectionFuses or circuit breakers that can only be used for protecting an appliance or other electrical equipment where upstream branch circuit overcurrent protection is already provided, or is not required. Voltage ratings typically are 600V or lower and interrupt ratings are lower than branch circuit protectors.
Electrical Term - FuseSurge ToleranceA characteristic of telecom fuses. The fuses are designed to withstand momentary or instantaneous current and voltage surges and continue to operate.
Electrical Term - FuseThreshold CurrentThe minimum available fault current at which a fuse is current limiting.
Electrical Term - FuseTotal Clearing I²tTotal measure of thermal energy developed within a circuit during the fuse’s clearing of a fault current. Total Clearing I²t is the sum of the melting I²t and arcing I²t.
Electrical Term - FuseVoltage DropThe fuse voltage drop or difference across its terminals when measured using a test current of 100% of the fuse's nominal rated current. In most cases, the fuse voltage drop can be ignored, as it is insignificant when compared to the circuit voltage. Attention must be paid to the voltage drops of low current fuses (50mA, 63mA, etc.) since their values are significantly higher. Some fuse standards specify a voltage drop maximum.
Electrical Term - FuseVoltage RatingThe maximum voltage at which a fuse is designed to operate. Exceeding the voltage rating of a fuse impairs its ability to clear an overload or short circuit safely. Voltage ratings are assumed to be for AC unless specifically labeled as DC.
Electrical Term - FuseWire-In-AirA type of surface mount fuse construction where a melting wire (filament) is suspended in air and physically attached to both fuse end caps via solding or welding.
Electrical Term - FuseE RatingCurrent ratings of 100E amps or less must melt in 300 seconds at 200 to 240% of the E (ampere) rating. Fuses with current ratings of 100E or below will melt in 300 seconds at a current value between 200 and 240% times the E (ampere) rating. Current ratings above 100E will melt in 600 seconds at a current value between 220% and 263% times the E (ampere) rating. If the current is higher than 240% or 264% times the E number, the user must consult the time-current curves for that particular fuse.
Electrical Term - FuseR RatingAn R-rated fuse will safely interrupt any current between its minimum interrupting rating and its maximum interrupting rating. The fuse will melt in 15 to 35 seconds when the current equals 100 times the R (ampere) rating. If the current is higher than 100 times the R (ampere) rating, the user must consult the time-current curves for that fuse. A comparison of the R rating and the maximum continuous current rating is as follows: R Rating/Max continous Current Rating (A): 2R/70A; 3R/100A; 4R/130A; 6R/170A; 9R/200A; 12R/230A; 18R/390A; 24R/450A; 30R/550A; 36R/650A; 42R/600A; 50R/700A.
Electrical Term - PTCHold CurrentThe maximum steady state current a PTC Device can pass through without causing it to trip
Electrical Term - PTCTrip CurrentThe minimum fault current that can pass through a PTC Device and cause it to trip
Electrical Term - PTCRated CurrentThe maximum fault current a PTC Device can withstand in its tripped state without physical damage at rated voltage ( Vmax )
Electrical Term - PTCRated VoltageThe maximum DC voltage a PTC Device can withstand in its tripped state without physical damage at rated current ( Imax )
Electrical Term - PTCInterrupt VoltageThe maximum AC voltage a PTC Device can withstand in its tripped state without physical damage; test parameter is used to comply with Telecom Power Cross conditions required in telecom industry standards
Electrical Term - PTCPower DissipationThe power dissipated by a PTC Device in its tripped state
Electrical Term - PTCMaximum Time-to-Trip (A)The fault current used for measuring the maximum Time-to-Trip of the PTC Device
Electrical Term - PTCMaximum Time-to-Trip (S)The time needed from the onset of a fault current until the PTC Device is tripped in seconds; varies based on the level of fault current
Electrical Term - PTCInitial ResistanceThe minimum resistance of a PTC Device in its initial (un-soldered) state
Electrical Term - PTCTypical ResistanceThe typical resistance of a PTC Device in its initial (un-soldered) state
Electrical Term - PTCMaximum ResistanceThe maximum resistance of a PTC Device 1 hour after being tripped at room temperature or after reflow soldering
Electrical Term - Breaker3mm GapAn IEC (European) safety agency standard that requires a minimum 3 millimeter gap to exist between contacts when in the OFF position. Any gap of 3mm or greater is considered a full gap. Full gap is a requirement when the switch is used as the main power d
Electrical Term - BreakerActuatorsActuators are the mechanical component used to manually turn a switch or circuit breaker on and off.
Electrical Term - BreakerAlarm SwitchA switch that is isolated electrically from the circuit breakers circuit. It works in unison with the power contacts to set off a sound or light indicator
Electrical Term - BreakerAlternate Action (double action)A "Push-On/Push Off" switch action, typically referring to maintained circuit pushbutton switches.
Electrical Term - BreakerAuxiliary SwitchA switch that is isolated electrically from the circuit breakers circuit. It is mechanically connected to the movement of the circuit breaker switching mechanism to provide on-off staus indication at a remote location.
Electrical Term - BreakerBaton ActuatorA handle actuator that is shaped in the form of a baton.
Electrical Term - BreakerBreak-Before-MakeSwitches that will only complete one circuit at a time, leaving an interval of time between the time one circuit opens and the next circuit closes.
Electrical Term - BreakerButt Action ContactsContacts that press "head-on" against each other when closing a circuit.
Electrical Term - BreakerCenter-OffA switch with three actuator positions. Contact is made (with one or several circuits) in the two extreme positions; in the center position of the actuator, all circuits are off.
Electrical Term - BreakerCircuit BreakerA mechanical overcurrent circuit protection device. The device trips or opens the circuit when excess current runs through the device. The device is activated by utilizing an electromagnetic coil or a heat sensitve bimetal strip that trips a spring loaded
Electrical Term - BreakerCommon TerminalLine terminal that can be alternately connected to two or more load terminals.
Electrical Term - BreakerCommon TripA feature on a multi-pole circuit protector in which an overload on any pole will cause all poles to open.
Electrical Term - BreakerContacts (CB)Components that form the junction of two electrical conductors through which current passes, used for making (closing) and breaking (opening) electrical circuits.
Electrical Term - BreakerContact BounceThe tendency for butt action contacts to bounce apart as they come together. The bouncing action can prolong an arc, or open and close the circuit very quickly several times before coming to a closed position.
Electrical Term - BreakerContact Rating (CB)The capacity of contacts to carry an electrical load.
Electrical Term - BreakerContact Resistance (CB)The resistance of a pair of contacts, measured at the terminals, which effectively appears in series with the load (mili-ohm range).
Electrical Term - BreakerDual CoilA circuit that provides contact opening when either an overcurrent or trip voltage is applied to respective coils. One coil will be a current trip and the second coil is used to provide a control function.
Electrical Term - BreakerDependent LampA lamp or lamps powered by the same circuit that a switch is controlling; the lamp turns on when the switch is activated.
Electrical Term - BreakerDetentA feature usually found in slide and rotary switches that denotes where the switch "clicks" into the various positions.
Electrical Term - BreakerDouble Break/Double MakeContacts that open at two separate places on a circuit.
Electrical Term - BreakerDouble InsulationDenotes an insulation system comprised of functional insulation and protective insulation, with the two insulations physically separated and arranged in such a way that they are not simultaneously subjected to the same deteriorating influences, temperatur
Electrical Term - BreakerDouble Pole -DP (switches)A switch device that opens, closes, or changes connection of two conductors in an electrical circuit.
Electrical Term - BreakerDouble Throw (DT)A switch that opens, closes, or completes a circuit at both extreme positions of its actuator.
Electrical Term - BreakerDry CircuitA low current circuit that does not generate enough power to generate an arc.
Electrical Term - BreakerDump CircuitA means to remotely trip a circuit breaker without there having to be a current overload.
Electrical Term - BreakerDuty ContinuousThe requirement that demands operation at a constant load for an indefinite period of time.
Electrical Term - BreakerDuty CycleThe ratio of on-time and off-time
Electrical Term - BreakerDuty IntermittentThe requirement that demands operation of alternate intervals of (1) load/no load, (2) load/rest, or (3) load/no load/rest.
Electrical Term - BreakerEquipment LeakageCommonly referred to as earth leakage or ground fault, an unintentional electrical connection between an energized conductor and "ground". Ground is an arbitrarily decided point whose voltage is taken to zero, in many situations, this point is the actual
Electrical Term - BreakerFeederAll circuit conductors between the service entrance equipment and the final branch circuit protector.
Electrical Term - BreakerGround Fault Circuit Interrupter or GFCIA device whose function is to interrupt the electric circuit to the load when a fault current to ground exceeds a predetermined value,
Electrical Term - BreakerHandle ActuatorAn actuator that is shaped in the form of a handle. When the actuator is tripped, the handle moves to the "OFF" position.
Electrical Term - BreakerHigh InrushLoads that require a higher amount of current or amperage when first turned on, compared to the amount of current required to continue running. An example of high inrush load is a light bulb, which may draw 20 times its normal operating current when first
Electrical Term - BreakerHydraulic Magnetic Circuit BreakerA mechanical circuit protection device. The main components are a coil, an iron core sealed in a tube filled with hydraulic fluid, a spring loaded actuator and two electical contacts. When excessive current from a current overload runs through the device,
Electrical Term - BreakerIndependent LampA lamp or lamps powered by a voltage source not controlled by the switch or circuit breaker action.
Electrical Term - BreakerInstantaneous TripIndicates that no intentional delay is purposely introduced in the opening time of a protector.
Electrical Term - BreakerInsulation ResistanceThe resistance between two normally insulated parts measured at a specified high DC potential (megohm range). Also referred to as Leakage Resistance.
Electrical Term - BreakerL Rating (switches)Denotes the ability of a switch to handle the initial high inrush of Tungsten Filament Lamp on AC Voltage only.
Electrical Term - BreakerLEDLight Emitting Diode
Electrical Term - BreakerLife Expectancy (Useful Life)Depends upon the end life criteria for a specific application. In order to determine you failure criteria, the following parameters should be known: dielectric strength, duty cycle, mechanical breakdown, contact resistance, insulation resistance, operatin
Electrical Term - BreakerLine TerminalA terminal that takes power from the power source.
Electrical Term - BreakerLoad TerminalA terminal that carries the current downstream to the equipment that the circuit breaker is protecting.
Electrical Term - BreakerMake-Before-BreakSwitches that complete a new circuit before breaking an old one.
Electrical Term - BreakerMaintained SwitchA switch that maintains the mode or position to which it is actuated.
Electrical Term - BreakerMicro GapA symbol appearing as a part of the switch rating that indicates a contact gap of less than 3 millimeters.
Electrical Term - BreakerMid TripWhen an actuator is tripped, the handle moves to a "Mid" position as opposed to the full "OFF" positon. This provides visual indication of a tripped breaker as compared to one that is merely turned OFF.
Electrical Term - BreakerMid-Trip Handle ActuatorA handle actuator where the handle moves to a "Mid" position as opposed to the full "OFF" positon when tripped. This provides visual indication of a tripped breaker as compared to one that is merely turned OFF.
Electrical Term - BreakerMomentary SwitchA switch that automatically returns to its original or at rest position.
Electrical Term - BreakerNormally ClosedOften abbreviated N.C., indicates that the circuit is closed when the switch is not operated. Activation of the switch causes the circuit to open.
Electrical Term - BreakerNormally OpenOften abbreviated N.O., indicates that the circuit is open when with switch is not operated. Activation of the switch causes the circuit to close.
Electrical Term - BreakerOperating ForceAlso known as Actuation Force, the force required to transfer a switch from one position to another.
Electrical Term - BreakerPaddle ActuatorA handle actuator that is shaped in the form of a padddle.
Electrical Term - BreakerParallel Pole TerminalTwo or more circuit breakers in a single package that are electrically isolated but mechanically tied.
Electrical Term - BreakerPoleThe number of completely separate circuits that can be active through a switch or simultaneously protected by a circuit breaker at any one time.
Electrical Term - BreakerPush Button ActuatorA handle actuator that is shaped in the form of a button. When the actuator trips, the button pops out. The circuit breaker is reset by pushing the button in.
Electrical Term - BreakerPush-On/Push-OffAn alternate action switch, often used on lamps, vacuum cleaners, etc. When pushed, the circuit closes. When pushed again, it opens. Often called 'Push-Push.'
Electrical Term - BreakerPush-Pull ActuatorA handle actuator that is shaped in the form of a knob. When the actuator trips, the knob pops out. The circuit breaker is reset by pushing the knob in.
Electrical Term - BreakerPush-to-Reset ActuatorA handle actuator that is shaped in the form of a button. When the actuator trips, the button pops out. The circuit breaker is reset by pushing the button in.
Electrical Term - BreakerQuick Break/Quick MakeSwitches designed to make or break circuits in less than 5 milliseconds to make or break. Recommended for use on DC circuits.
Electrical Term - BreakerRelay TripThis circuit design permits the overload sensing coil to be placed in a circuit which is electrically isolated from the trip contacts but mechanically linked. Overload in the coil circuit will cause the contact circuit to open. The coil may be actuated b
Electrical Term - BreakerSealed Toggle ActuatorA handle actuator that has a baton toggle switch with a sealed metal mounting bushing for operation in harsh environments.
Electrical Term - BreakerSeries TripThe most popular circuit type for a magnetic hydraulic circuit breaker. The sensing coil and the contacts are in series with the load being protected. The actuator handle indicates the circuit status. In addition to providing overcurrent circuit protecti
Electrical Term - BreakerShunt TripDesigned to control two separate loads with one assembly. The control is established by providing overload protection for the critical load. When the current through the load reached the trip point, the circuit breaker will open and remove power from both
Electrical Term - BreakerSingle Break / Single MakeContacts that open and close a circuit at only one place.
Electrical Term - BreakerSingle Color RockerA single color rocker actuator for circuit breakers that offer front panel operation.
Electrical Term - BreakerSingle Pole - SP (switches)A switch device that opens, closes, or changes the connection of a single conductor in an electrical circuit.
Electrical Term - BreakerSingle Throw (ST)A switch that opens, closes or completes a circuit at only one of the extreme positions of its actuator.
Electrical Term - BreakerSlow Break/Slow MakeSwitches designed to make or break circuits within 8-12 milliseconds. Typically used for AC applications.
Electrical Term - BreakerSnap-ActionNon-teasable switch action having unstable equilibrium so that it must be either 'ON' or 'OFF'. Can also be referred to as 'Push-Push.'
Electrical Term - BreakerSwitch OnlyA circuit design that does not provide overcurrent protection. It is the same as a series trip circuit without the coil mechanism. It provides low cost, heavy duty switch capability. It can then be used as a single or multi-pole power switch.
Electrical Term - BreakerTerminal1) The point at which electrical connections are made. 2) The mechanical device at such a point in a circuit, as at the end of a wire or cable, by means of which an electrical connection may be made.
Electrical Term - BreakerToggle ActuatorA handle actuator that has a baton toggle switch.
Electrical Term - BreakerTwo Color RockerA two color circuit breaker rocker actuator that offers front panel operation and visual indication of the ON or TRIPPED/OFF mode.
Electrical Term - BreakerUltimate Trip CurrentThe minimum value of current that will cause tripping of a protective device.
Electrical Term - BreakerVoltage TripA protective device that is factory calibrated to trip at a predetermined voltage value.
Electrical Term - BreakerWiping Action ContactsSelf-cleaning contacts that wipe or slide against each other when opening or closing a circuit.
Electrical Term - MOVClamping Voltage (Vc)The peak voltage across the varistor measured under condition of a specified peak Vc pulse current and specified waveform. The maximun voltage let through to downstream components.
Electrical Term - MOVClamping Current - IpkThe peak current across the varistor measured under condition of a specified peak Vc pulse current and specified waveform. The maximun current let through to downstream components.
Electrical Term - MOVRated Peak Single Pulse Transient Current - ItmMaximum peak current which may be applied for a single 8/20 ms impulse, with rated line voltage also applied, without causing device failure.
Electrical Term - MOVRated Peak Single Pulse Transient Current - IpkMaximum peak current which may be applied for a single 8/20 ms impulse, with rated line voltage also applied, without causing device failure.
Electrical Term - MOVLifetime Rated Pulse CurrentsDerated values of Itm for impulse durations exceeding that of an 8/20 ms waveshape, and for multiple pulses which may be applied over the device's rated lifetime.
Electrical Term - MOVRated RMS Voltage - Vm(ac)Maximum continuous sinusoidal RMS voltage which may be applied.
Electrical Term - MOVRated DC Voltage - Vm(dc)Maximum continuous DC voltage which may be applied.
Electrical Term - MOVDC Standby Current - IdVaristor current measured at rated voltage, Vm(dc).
Electrical Term - MOVNominal Varistor Voltage - Vn(dc)Average voltage across the varsitor measured at a specified pulsed DC current, In(dc), of specific duration. In(dc) is specified by the varistor manufacturer.
Electrical Term - MOVMinimum Varistor Voltage - Vnom minMinimum voltage across the varsitor measured at a specified pulsed DC current, In(dc), of specific duration. In(dc) is specified by the varistor manufacturer.
Electrical Term - MOVMaximum Varistor Voltage - Vnom maxMaximum voltage across the varsitor measured at a specified pulsed DC current, In(dc), of specific duration. In(dc) is specified by the varistor manufacturer.
Electrical Term - MOVPeak Nominal Varistor Voltage - Vn(ac)Voltage across the varistor measured at a specified pulsed AC current, In(ac) of specific duration. In(ac) is specified by the varistor manufacturer.
Electrical Term - MOVRated Recurrent Peak Voltage - VpmMaximum recurrent peak voltage which may be applied for a specified duty cycle and waveform.
Electrical Term - MOVRated Single Pulse Transient Energy - WtmEnergy which may be dissipated for a single impulse of maximum rated current at a specified waveshape, with rated RMS voltage or rated DC voltage also applied, without causing device failure.
Electrical Term - MOVTypical Capacitance - CThe ability of a device to store energy and resist changes in voltage. The higher the capacitance, the higher the rating for the varistor. Capacitance is measured in pico Farads (pF).
Electrical Term - MOVRated Transient Average Power DissipationMaximum average power which may be dissipated due to a group of pulses occurring within a specific isolated time period, without causing device failure.
Electrical Term - MOVVaristor Voltage - VxVoltage across the varistor measured at a given current, IX.
Electrical Term - MOVVoltage Clamping Ratio - Vc/VpmA figure of merit measure of the varistor clamping effectiveness as defined by the symbols (Vc) ÷ (Vm(ac)), (Vc)÷ (Vm(dc)).
Electrical Term - MOVNonlinear Exponent - aA measure of varistor nonlinearily between two given operating currents, I1 and I2, as described by I = kVa where k is a device constant, I1 = I =12, and a12 = (logl2/l1) ÷ (logV2/V1).
Electrical Term - MOVDynamic Impedance - ZxA measure of small signal impedance at a given operating point as defines by: Zx = (dVx) ÷ (dlx).
Electrical Term - MOVResistance - RxStatic resistance of the varistor at a given operating point as defined by: Rx = (Vx) ÷ (Ix).
Electrical Term - MOVCapacitance - CCapacitance between the two terminals of the varistor measured at a specified frequency and bias.
Electrical Term - MOVAC Standby Power - PdVaristor AC power dissipation measured at rated RMS voltage Vm(ac).
Electrical Term - MOVVoltage Overshoot - VosThe excess voltage above the clamping voltage of the device for a given current that occurs when current waves of less that 8ms virtual front duration are applied. This value may be expressed as a % of the clamping voltage (Vc) for an 8/20 ms current wave.
Electrical Term - MOVResponse TimeThe time between the point at which the wave exceeds the clamping voltage level (VC) and the peak of the voltage overshoot. For the purpose of this definition, clamping voltage as defined with an 8/20 ms current waveform of the same peak current amplitude as the waveform used for this response time
Electrical Term - MOVOvershoot DurationThe time between the peak voltage level (Vc) and the point at which the voltage overshoot has decayed to 50% of its peak. For the purpose of this definition, clamping voltage is defined with an 8/20 ms current waveform of the same peak current amplitude
Electrical Term - MOV8/20 ms Test WaveformA test waveform with characteristics similar to a lightning surge. The wave has an 8ms rise to peak value and a 20ms decline to a 50% decay of peak value.Used to test the Itm, Vc and Ipk for all varistor series.
Electrical Term - MOV10/1000 ms Test WaveformA test waveform with characteristics similar to the high energy surges found in motors and transformers. A more robust and longer waveform than the 8\20 ms. Used to test WTM for the CH, LA, MA RA and ZA Series.
Electrical Term - MOV2ms Rectangular Test WaveformA test waveform with similar characteristics to the 10/1000 ms but more precise in certain applications. Used to test the WTM for the C-III Series.
Electrical Term - MOV2ms Square Test WaveformA test waveform having the same total energy as the 10/1000 ms waveform but it is an easier test to reproduce. Used to test the WTM for the UltraMOV™ Series.
Electrical Term - MOVRated RMS Voltage Vm(ac)Maximum continuous sinusoidal RMS voltage which may be applied.
Electrical Term - GeneralAlternating Current (AC)A condition in an electric circuit where the voltage is raised above the upper design limit. This condition is potentially damaging to the components in the circuit. An overvoltage event can be a temporary transient spike or longer in duration. Typical sources of an overvoltage event are close proximity lightning strikes, discharges of electrostatic electricity, the switching on and off of an inductive load or the accidental crossing of power lines.
Electrical Term - GeneralAmpacityThe current a conductor can carry continuously without exceeding its temperature rating. Ampacity is a function of cable size, insulation type and the conditions of use.
Electrical Term - GeneralAmpere (Amp)The measurement of intensity of rate of flow of electrons in an electric circuit An ampere (amp) is the amount of current that will flow through a resistance of one ohm under a pressure of one volt. Ampere is often abbreviated as “A”.
Electrical Term - GeneralArc FlashArc Flash is the result of a rapid release of energy due to an arcing fault between a phase bus bar and another phase bus bar, neutral or a ground. During an arc fault the air is the conductor. Arc faults are generally limited to systems where the bus voltage is in excess of 120 volts. Lower voltage levels normally will not sustain an arc. An arc fault is similar to the arc obtained during electric welding.
Electrical Term - GeneralAvailable Fault CurrentThe maximum short circuit current that can flow in an unprotected circuit. Also known as available short circuit current.
Electrical Term - GeneralAvailable Short Circuit CurrentThe maximum short circuit current that can flow in an unprotected circuit. Also know as available fault current.
Electrical Term - GeneralBusbarAn electrical conductor in the form of rigid bars serving as a common connection for two or more electrical circuits.
Electrical Term - GeneralCascade CircuitA series arrangement of more than one protector connected between the power source and the load.
Electrical Term - GeneralCircuit (Electrical)The closed loop through which electricity can flow.
Electrical Term - GeneralClosed CircuitAn electrical circuit that allows an uninterrupted flow of electricity from the source of power, through the conductor or wire, to the load, and then back again to the ground of source of power.
Electrical Term - GeneralConductorA material or object that permits an electric current to flow easily
Electrical Term - GeneralCoordinationThe ability of a circuit protector with the lowest rating in a cascade arrangement to trip before those with higher ratings (see Cascade Circuit).
Electrical Term - GeneralCurrent (Electric)A flow of electrons in an electrical conductor. The strength or rate of movement of the electricity is measured in amperes. A generic term usually modified by an adjective (i.e., AC or DC), the amount of electrical charge flowing through a conductor, as compared to Volts, which is the force that drives the electrical charge.
Electrical Term - GeneralDielectric StrengthThe highest voltage an insulator can withstand without allowing current to flow. Also referred to as breakdown voltage. For switches, also represents the strength between live parts and operator at accessible surfaces.
Electrical Term - GeneralDifference in PotentialAlso known as voltage or electromotive force (EMF).The force that causes free electrons to move in a conductor as electric current.
Electrical Term - GeneralDIN-RailA metal rail of a standard type widely used for mounting circuit breakers, fuseholders, power distribution blocks and industrial control equipment inside equipment racks. The most common size is 35mm high by 7.5mm thick.
Electrical Term - GeneralDirect Current (DC)Current flows in only one direction. Dircet current is usually supplied from a battery or power supply.
Electrical Term - GeneralEffectiveValueThe value of alternating current that will produce the same amount of energy in a resistance as the corresponding value of direct current. Also known as RMS Value
Electrical Term - GeneralElectrical LoadThat part of the electrical system which actually uses the energy or does the work required.
Electrical Term - GeneralElectromotive Force (EMF)Also known as voltage or difference in potential. The force that causes free electrons to move in a conductor as electric current.
Electrical Term - GeneralFaultAn accidental condition in which a current path becomes available which by-passes the connected load.
Electrical Term - GeneralFault CurrentThe amount of current flowing in a faulted circuit.
Electrical Term - GeneralFrequencyThe number of cycles through which an alternating current passes per second. Frequency has been generally standardized in the United States electric utility industry at 60 cycles per second (60 hertz)
Electrical Term - General50/60HzThe frequency of an AC circuit measured in Hertz (HZ). Refers to the number of cycles per second. 50/60Hz is between 50 and 60 cycles per second.
Electrical Term - GeneralGround FaultAn unintentional electrical connection between an energized conductor and 'ground'. Ground is an arbitrarily decided point whose voltage is taken to zero, in many situations, this point is the actual ground or earth.
Electrical Term - GeneralHorsepower (hp)Motors are rated in horsepower (HP) or fractions of horsepower (1/4, 1/3, 1/2, etc.) Mechanically, One horsepower (1HP) is equal to 33,000 pounds being moved 1 foot in 1 minute (or 33,000ft-lb/min). One horsepower (1HP) is also equal to 746 watts of electrical power.
Electrical Term - GeneralInductive LoadAn electrical load which pulls a large amount of current (an inrush current) when first energized. After a few cycles or seconds the current “settles down” to the full-load running current. Inductive loads are typical energized by equipmnet with coils such as motors or transformers.
Electrical Term - GeneralInrushThe amount of current a load takes on initial start up. This can be many times it's normal operating current but is usually of very short duration.
Electrical Term - GeneralKiloamperes (kA)1,000 amps
Electrical Term - GeneralLet-through CurrentThe actual fault current passing through a protective device as compared to the current available to the device.
Electrical Term - GeneralLoad (Electric)The amount of electric power delivered or required at any specific point or points on a system. The requirement originates at the energy consuming equipment of the consumers.
Electrical Term - GeneralOhmThe unit of measure for electric resistance. An ohm is the amount of resistance that will allow one ampere to flow under a pressure of one volt.
Electrical Term - GeneralOhm’s LawThe relationship between voltage, current, and resistance, expressed by the equation E = IR, where E is the voltage in volts, I is the current in amps, and R is the resistance in ohms.
Electrical Term - GeneralOpen CircuitAn electrical circuit that will not conduct electricity because either air, or some other insulator has stopped or broken the flow of current in the loop.
Electrical Term - GeneralOvercurrentA condition which exists in an electrical circuit when the normal load current is exceeded. Overcurrents take on two separate characteristics, overloads and short circuits. An overload condition is any current flowing within the circuit path that is higher than the circuit’s normal full load current. An overload is typically 2 to 5 times the magnitude of a circuit’s normal operating current. A short circuit is an overcurrent condition that leaves the normal current path and which greatly exceeds the normal full load current of the circuit by a factor of tens, hundreds, or thousands. Components and equipment can be damaged by both types of overcurrents.
Electrical Term - GeneralOverloadAn overcurrent which exceeds the normal full load current of a circuit. An overload is typically 2 to 5 times the magnitude of a circuit’s normal operating current. It will cause damage if allowed to persist. Also characteristic of this type of overcurrent is that it does not leave the normal current carrying path of the circuit. The current flows from the source, through the conductors, through the load, back through the conductors, to the source again.
Electrical Term - GeneralOvervoltage"A condition in an electric circuit where the voltage is raised above the upper design limit. This condition is potentially damaging to the components in the circuit. An overvoltage event can be a temporary transient spike or longer in duration. Typical sources of an overvoltage event are close proximity lightning strikes, discharges of electrostatic electricity, the switching on and off of an inductive load or the accidental crossing of power lines. "
Electrical Term - GeneralResistanceThe opposition a conductor offers to current. Anything that slows down or resists the flow of electricity measured in ohms.
Electrical Term - GeneralResistive loadAn electrical load which is characterized by not drawing any significant inrush current. When a resistive load is energized, the current rises instantly to its steady state value, without first rising to a higher value.
Electrical Term - GeneralRMS CurrentThe RMS (root-mean-square) value of any periodic current is equal to the value of the direct current which, flowing through a resistance, produces the same heating effect in the resistance as the periodic current does.
Electrical Term - GeneralRMS ValueThe value of alternating current that will produce the same amount of energy in a resistance as the corresponding value of direct current. Also known as Effective Value
Electrical Term - GeneralShort CircuitAn overcurrent that leaves the normal current path and greatly exceeds the normal full load current of the circuit by a factor of tens, hundreds, or thousands times. Also characteristic of this type of overcurrent is that it leaves the normal current carrying path of the circuit. It takes a “short cut” around the load and back to the source.
Electrical Term - GeneralShort Circuit CausesA short-circuit is current flowing outside of its normal path. It is caused by an insulation breakdown or faulty connection. During a circuit’s normal operation, the connected load determines current. During a short circuit, the current bypasses load and the current takes a “shorter path,” hence: short-circuit. Since there is no load impedance, only the total distribution system’s impedance from the utility’s generators to the fault will limit current flow.
Electrical Term - GeneralShort Circuit Current Rating (SCCR)Also known as the Short Circuit Withstand Rating. The maximum short-circuit current an electrical component can sustain without the occurrence of excessive damage when protected with an overcurrent protective device.
Electrical Term - GeneralShort Circuit Withstand RatingAlso known as the Short Circuit Current Rating (SCCR). The maximum short-circuit current an electrical component can sustain without the occurrence of excessive damage when protected with an overcurrent protective device.
Electrical Term - GeneralTotal Clearing TimeThe time elapsing from the initiation of overload current to final current interruption.
Electrical Term - GeneralVolt (V)The volt (V) is the Standard International (SI) unit of electric potential or electromotive force. A potential of one volt appears across a resistance of one ohm when a current of one ampere flows through that resistance.
Electrical Term - GeneralVoltageElectric potential or potential difference expressed in volts
Electrical Term - GeneralVoltage of a CircuitThe electric pressure of a circuit in an electric system measured in volts. It is generally a nominal rating based on the maximum normal effective difference of potential between any two conductors of a circuit.
Electrical Term - GeneralWattThe unit of electrical power required to do work at the rate of one joule/second or the power consumed when one ampere flows with one volt applied to a circuit.
Electrical Term - GeneralWithstand RatingThe maximum current that an unprotected electrical component can sustain for a specified period of time without the occurrence of extensive damage.
Electrical Term - GeneralKilovolts (kV)1,000 volts.
Electrical Term - Reed SwitchActivate DistanceThe distance between a reed sensor and its actuator where the contacts begin to move from an inactive state to an active state.
Electrical Term - Reed SwitchActuatorA packaged magnetic component used in conjunction with a reed switch. When the actuator is positioned in close proximity to a reed switch it causes the reed switch to move from an inactive state to an active state. Actuators are matched with specific reed sensor series and are sold separately.Bare magnets are also available.
Electrical Term - Reed SwitchAmpere-Turn (AT)The unit of measure used to define the sensitivity of a switch or measure of the magnetic field strength. It is the product of the number of turns of the coil the switch is tested in and the current in amperes flowing in that coil. The lower the AT of a Reed Switch the lower the magnetic field strength required to close the Reed Switch.
Electrical Term - Reed SwitchArc SuppressionContact protection circuitry used to protect the contacts of reed switches against loads which produce high inrush currents on closure or high voltages on opening.
Electrical Term - Reed SwitchBounceWhen closing, the contacts of a reed switch will initially bounce or chatter before reaching a stable closed state. This could be seen as multiple inputs to certain logic or digital circuits. If contact bounce is detrimental to your circuit design, a debounce circuit should be used.
Electrical Term - Reed SwitchBreakdown VoltageThe maximum voltage level a switch can withstand without leakage current between the open contacts. On some larger, evacuated reed switches, breakdown voltages can exceed several thousand volts. Also refered to as the Dielectric Voltage and is generally much higher than the Switching Voltage.
Electrical Term - Reed SwitchCapacitive LoadsLoads which consist of a capacitor either in series or in parallel with the contacts of a reed switch. There is a high capacitive current when the switch contacts close. Without any current limiting device, the peak current can reach up to tens of amps.
Electrical Term - Reed SwitchCarry CurrrentThe continuous current that the reed switch can carry while closed at 125% of the Pull-In Value.
Electrical Term - Reed SwitchChange Over SwitchA small enclosed single pole double throw switch.  A switch that breaks contact with one path before connecting with another.
Electrical Term - Reed SwitchCoaxial ShieldThe coaxial shield normally consisting of copper is found inside the coil of a reed relay. It is used for switching high frequency signals.
Electrical Term - Reed SwitchCoil ResistanceThe resistance in ohms of a reed relay coil.
Electrical Term - Reed SwitchCoil VoltageThe nominal coil voltage is the normal operating voltage of a reed relay. The must operate voltage is the voltage needed to change a relay from its inactive to active state. The must release voltage is the minimum voltage at which a relay will change from its active to inactive state. The maximum coil voltage should never be exceeded.
Electrical Term - Reed SwitchContact FormThe inactive state of the contacts of a reed switch. Typical states are Normally Open (Form A), Normally Closed (Form B) and Change Over (Form C).
Electrical Term - Reed SwitchContact Form AA Single Pole, Single Throw, Normally Open (SPST NO) switch type.
Electrical Term - Reed SwitchContact Form BA Single Pole, Single Throw, Normally Closed (SPST NC) swith type. A Form B switch is the least common reed switch configuration and operates the opposite of a Form A. The Form B switch also has two contacts, but they are Normally Closed, meaning that, in its default state, the circuit is closed and will conduct electricity. Introduction of a magnetic field will cause the contacts of a Form B switch to separate, opening the circuit and breaking the flow of electricity. Removing the magnetic field will allow the contacts to return to the Normally Closed position and close the circuit.
Electrical Term - Reed SwitchContact Form CA Single Pole, Double Throw, Change Over (SPDT CO) switch type. This switch breaks contact with one path before connecting with another.
Electrical Term - Reed SwitchContact RatingThe product of the switching voltage and the current expressed in Watts. It should never exceed the wattage rating of the reed switch.
Electrical Term - Reed SwitchContact ResistanceThe initial closed contact resistance in ohms.
Electrical Term - Reed SwitchDiode SuppressionAn internal diode in parallel with the reed relay coil used to protect the circuitry powering the relay from the voltage spike generated from the coil when it is deactivated.
Electrical Term - Reed SwitchDrop-Out (DO)The value in Ampere-Turns when the switch contacts release.
Electrical Term - Reed SwitchElectrostatic ShieldUsed to reduce any noise or electrostatic coupling that may occur between the coil of a relay and the internal magnetic reed switch. The electrostatic shield normally consists of copper, terminated to a designated pin externally connected to ground.
Electrical Term - Reed SwitchEMCElectro Magnetic Compatibilty (EMC) means that an electronic or electrical product shall work as intended in its environment. The electronic or electrical product shall not generate electromagnetic disturbances which may influence other products or compon
Electrical Term - Reed SwitchHermetically SealedThe contacts of a reed switch along with an inert gas are sealed inside of a glass capsule. A glass to metal seal is used to provide the lowest rate of gas leakage possible.
Electrical Term - Reed SwitchInductive Loads Loads which consist of an inductive component such as the coil from an electromagnetic counter, relay, or solenoid. The inductance of the coil stores energy which results in a high arc voltage as the contacts of the reed relay open. Depending on the value of the inductance, the voltage induced by the coil can be upwards of several hundred volts.
Electrical Term - Reed SwitchInrush CurrentThe high current upon closure caused by the low resistance of a cold filament in a lamp load, by a reverse-magnetised core in an AC inductive load, or by a capacitive load.
Electrical Term - Reed SwitchInsulation ResistanceThe resistance in ohms measured across the open contacts of a reed switch or relay or between the isolated terminals of a reed relay.
Electrical Term - Reed SwitchLamp LoadsLoads which consist of a lamp containing a tungsten or similar type of filament. The filament will have a high inrush current due to its initial low resistance when cold.
Electrical Term - Reed SwitchMagnetic ShieldAn external metal housing of a reed relay used to protect either the internal magnetic reed switch from external magnetic influences, or to protect any external neighbouring components from the magnetic influences of the relay.
Electrical Term - Reed SwitchOperate Time The amount of time (including bounce) measured from the point at which the coil of an inactive relay is energised to the point at which the contacts of the relay arrive at their active state. For a reed switch, this is measured using a standard coil energised to 150% of the Pull-In value.
Electrical Term - Reed SwitchOperating TemperatureThe maximum or minimum temperature at which a device can be operated without significant performance degradation.
Electrical Term - Reed SwitchPull In AT RangeThe point where the reed switch contacts close when subjected to magnetic field. It is usually expressed in a min-max range of Ampere-Turns (AT) which is a measure of magnetic field strength.
Electrical Term - Reed SwitchPull-In ValueThe Ampere-Turn value (AT) at which normally-open contacts close or normally-closed contacts open.
Electrical Term - Reed SwitchRating SensitivityThe value at which contact ratings and operating characteristics are determined. Derating may be required below this value.
Electrical Term - Reed SwitchReedsA reed is a basic component of a reed switch. The reeds in a reed switch are two ferromagnetic nickel-iron wires that are hermetically sealed in a glass capsule. The two wires are formed into ‘reeds’ by flattening one end. The reeds are aligned with a small overlap to create a point of contact.
Electrical Term - Reed SwitchReed SensorA reed switch that is packaged within an external housing for simplified mounting/connecting and for additional protection against environmental influences.
Electrical Term - Reed SwitchSwitch TypeRefers to the contact form in a reed switch. The contact form is the inactive state of the contacts of a reed switch. Typical states are Normally Open (Form A), Normally Closed (Form B) and Change Over (Form C).
Electrical Term - Reed SwitchSwitching CurrentThe maximum amount of current that the contacts of a reed switch can withstand on opening or closure.
Electrical Term - Reed SwitchSwitching VoltageThe maximum allowable voltage capable of being switched across the contacts. Switching voltages above the arcing potential can cause some metal transfer. Specified as a maximum in units of Volts DC or Volts Peak;
Electrical Term - TVS DiodeTVS DiodeA TVS diode is a discreet, fast switching, semiconductor crowbar device that protects a wide variety of applications from overvoltage transients such as ESD, inductive load switching or lightning. "TVS" stands for discrete transient voltage suppression.
Electrical Term - TVS DiodeClamping DeviceA protective device that suppresses overvoltages above its rated breakdown voltage. It automatically resets when the overvoltage is removed, but absorbs much more of the transient energy internally than a similarly rated crowbar device. Unlike a crowbar device which short-circuits the overvoltage to ground, a clamping device goes to a low-resistance state to limit the voltage to its rated clamping voltage.
Electrical Term - TVS DiodeCrowbar DeviceA class of suppressors that exhibits a "crowbar" characteristic that is usually associated with a 4-layer NPNP silicon bipolar device or a gas plasma/gas discharge tube (GDT) device. Upon reaching its threshold or breakover voltage rating, further increases in current flow will cause the device to rapidly conduct to ground with only a few volts of forward voltage drop. In essence, the line is momentarily "short-circuited" during the transient event. A crowbar device will not automatically return to normal operation when the overvoltage condition is removed; power must be removed entirely to stop its conduction.
Electrical Term - TVS DiodeOperating Temperature RangeThe minimum and maximum ambient operating temperature of the circuit in which a device will be applied. Operating temperature does not allow for the effects of adjacent components, this is a parameter the designer must take into consideration.
Electrical Term - TVS DiodeUnidirectionalA TVS device with asymmetrical current versus voltage properties. A unidirectional TVS is best suited for protecting circuit nodes whose signals are unidirectional or always above or below the reference voltage, usually ground.
Electrical Term - TVS DiodeBidirectionalA TVS device with symmetrical I-V properties. A bidirectional TVS is best suited for protecting electrical nodes whose signals are bidirectionalor can have voltage levels both above and below the reference voltage, usually ground.
Electrical Term - TVS DiodeCapacitance (pF)The property of a circuit element that permits it to store an electrical charge. In circuit protection, the off-state capacitance is typically measured at 1 MHz with a 2V bias applied.
Electrical Term - TVS DiodeReverse Standoff VoltageIn the case of a uni-directional TVS diode, this is the maximum peak voltage that may be applied in the 'blocking direction' with no significant current flow. In the case of a bi-directional transient, it applies in either direction. The device VR should be equal to, or great than, the peak operating level of the circuit (or part of the circuit) to be protected. This is to ensure that TVS Diode does not clip the circuit drive voltage. It is the same definition as Maximum Off-state Voltage and Maximum Working Voltage.
Electrical Term - TVS DiodeStandoff VoltageThe maximum peak voltage that may be applied in the 'blocking direction' with no significant current flow. The device VR should be equal to, or greater than, the peak operating level of the circuit (or part of the circuit) to be protected. This is to ensure that TVS Diode does not clip the circuit drive voltage. It is the same definition as Maximum Off-state Voltage and Maximum Working Voltage.
Electrical Term - TVS DiodeBreakdown Voltage Vbr (volts)Breakdown voltage measured at a specified DC test current, typically 1mA. Usually a minimum and maximum is specified.
Electrical Term - TVS DiodeMax Reverse Leakage Ir (uA)The maximum continuous voltage that can be applied to the TVS Diode that will not cause the Diode to conduct. It is measured by running a small test current (reverse bias current) through the device and measuring the resulting voltage.
Electrical Term - TVS DiodeMin Breakdown Voltage Vbr (volts)The minimum voltage level at which the TVS Diode will begin to conduct. It is measured at a DC test current listed on the datasheet (typically 1mA). This condition occurs when the device's maximum reverse leakage current is exceeded during an avalanche or runaway mode. The actual breakdown voltage of the diode is greater than the reverse standoff voltage (VR) by approximately five to ten percent.
Electrical Term - TVS DiodeMax Breakdown Voltage Vbr (volts)The maximum voltage level at which the TVS Diode can safely withstand during conduction. It is measured at a DC test current listed on the datasheet (typically 1mA). This condition occurs when the device's maximum reverse leakage current is exceeded during an avalanche or runaway mode. The mechanism in which breakdown occurs in TVS diodes—specified at the voltage level at which this fault occurs. If this maximum voltage rating is exceeded, the TVS Diode may be destroyed.
Electrical Term - TVS DiodeTest Current It (mA)Test current. Typically 1mA when measuring the device Breakdown Voltage.
Electrical Term - TVS DiodePower RatingThe maximum repetitively applied current the TVS Diode can withstand without damage. Usually a 10x1000µs double exponential waveform is used, but an 8x20µs waveform might also be used if stated. The Power Rating can be expressed in amps or watts.
Electrical Term - TVS DiodePeak Pulse Current Ipp (amps)The Peak Pulse Current (IPP) identifies the maximum repetitively applied current the TVS Diode can withstand without damage. Usually a 10x1000?s double exponential waveform is used, but an 8x20?s waveform might also be used if stated. The required IPP ca
Electrical Term - TVS DiodePeak Pulse Power Ppp (watts)Expressed in Watts or Kilowatts, for a 1ms exponential transient. It is the maximum repetitively applied current the TVS Diode can withstand without damage (Ipp) multiplied by Vcl.
Electrical Term - TVS DiodeMaximum Clamping Voltage Vc or Vcl (volts)Maximum voltage which can be measured across the protector when subjected to the Maximum Peak Pulse Current based on 10/1000µs exponential waveform.
Electrical Term - TVS DiodePeak Pulse Current IPPThe Peak Pulse Current IPP (amps) identifies the maximum repetitively applied current the TVS Diode can withstand without damage. Usually a 10x1000µs double exponential waveform is used, but an 8x20µs waveform might also be used if stated. The required IPP can only be determined by dividing the peak transient voltage by the source impedance. Note that the TVS Diode failure mechanism is a short circuit; if the TVS Diode fails due to a transient, the circuit will still be protected.
Electrical Term - ThyristorCritical Rate-of-rise of On-state Current (di/dt)Maximum value of the rate-of-rise of on state curretn which a thyristor can withstand without a deleterius effect.
Electrical Term - ThyristorCritical Rate-of-rise of Off-state Voltage (dv/dt)Minimum value of the rate-of-rise of principla voltage which will cause switching from the off state to the on state.
Electrical Term - ThyristorCritical Rate-of-rise of CommutationVoltage of a TMinimum value of the rare-of-rise of principal voltage which will cause switching from the offstate to the on state immediately following on-state current conduction in the opposite current.
Electrical Term - ThyristorBreakover Current (Ibo)Principal current at the breakover point.
Electrical Term - ThyristorRepetitive Peak Off-state Current (Idrm)Maximum Leakage current that may occur under the conditions of Vdrm.
Electrical Term - ThyristorGate Trigger Current (Igt)Minimum gate current required to switch a thyristor from the off state to the on state.
Electrical Term - ThyristorHolding Current (Ih)Minimum principal current required to maintain the thyristor on state.
Electrical Term - ThyristorPeak Pulse Current (Ipp)Peak pulse current at a short time duration and specified waveshape.
Electrical Term - ThyristorRepetitive Peak Reverse Current (Irrm)Maximum leakeage current that may occur under conditions of Vrrm.
Electrical Term - ThyristorSwitching Current (Is)Current at VS when a Sidac swithces from the clamping state to on state.
Electrical Term - ThyristorOn-State Current (It(rms))Anode cathode principal current that may be allowed under stated conditions, usually the full-cycle RMS current.
Electrical Term - ThyristorSurge (Non-repetitive) On-state Current (Itsm)Peak single cycle AC current pulse allowed.
Electrical Term - ThyristorBreakover Voltage (Vbo)Principal voltage at the breakover point.
Electrical Term - ThyristorRepetitive Peak OFF-state Voltage (Vdrm)Maximum allowable instantaneous value of repetitive off-state voltage that may be applied across a bidirectional thyristor (forward or reverse direction) ora unidirectional SCR (forward direction only).
Electrical Term - ThyristorGate Trigger Voltage (Vgt)Minimum gate voltage required to produce the gate trigger current.
Electrical Term - ThyristorRepetitive Peak Reverse Voltage (Vrrm)Maximum allowable instantaneous value of a repetitive reverse voltage that may be applied across an SCR without causing reverse current avalanche.
Electrical Term - ThyristorSwitching Voltage (Vs)Voltage point after Vbo when a SIDAC switches from a clamping state to on state.
Electrical Term - ThyristorOn-State Voltage (Vt)Voltage point after Vbo when a SIDAC switches from a clamping state to on state.
Fuse HolderChassis Mount Fuse HolderSimilar to a panel mount fuseholder. A fuseholder that is mounted to the metal frame or other physical structure on which the circuit boards and other electronic/electrical components are mounted. A chassis mount fuseholder can be open or enclosed. Normally, the fuseholder will use the chassis wall as an attachment point as it protrudes through the chassis wall allowing connections on either side of the component.
Fuse HolderFinger SafeFuse holders that designed so that there is no exposure to energized parts. These holders have IP-20 finger-safe fusible features that meet global standards for minimizing contact with current-carrying parts.
Fuse HolderFuse BlockAn insulating base on which are mounted fuse clips or other contacts designed to mount a fuse in a circuit. The base is usually made of bakelite, thermoplastic, porcelain or some other refractory material.
Fuse HolderFuse ClipA metal device that securely clasps the end caps or ferrules of a fuse and holds it in an electrical circuit using tension and friction. Fuse clips are typically soldered or screwed into a board or block.
Fuse HolderIn-line FuseholderAn In-line fuseholder is wired into the power line and provides protection for the wire feeding a circuit. These type of fuseholders can be for electronic, automotive or midget and Class CC fuses.
Fuse HolderInternational Shock SafeInternational Shock Safe fuseholders are designed to eliminate the possibility of electrical shock. These are typically panel mount fuse holders designed for 3AG, 5x20 and 2AG fuses.
Fuse HolderModular Fuse BlockModular fuse blocks are touch-safe fuseholders that mount on din rail. Designed to accomadate Class CC and Class J as well as Midget and European 10x38, 14x51 and 22x58 mm fuses. Come with optional open fuse indication.
Fuse HolderPanel Mount Fuse HolderA fuseholder that is mounted in a flat panel that provides access to the fuse from the front side of the panel. Panel mounted fuseholders allow for easy access for the end-user to replace the fuse in the field. The panel mount fuseholder is shock-safe meaning that the fuse can be removed safely when the cap is removed.
Fuse HolderPC Board Mount FuseholderA fuseholder that is mounted directly on the printed circuit board allowing for easy replacent of the fuse.
Fuse HolderPyramid Fuse BlockDesigned as a space saving, open style fuseholder for Class J fuses. Manufactured by Bussmann, these holders can be din rail or chassis mount.
Fuse HolderRejection Fuse BlockA fuse block which will only accept fuses of a specific UL class. Rejection is a safety feature intended to prevent the insertion of a fuse with an inadequate voltage or interrupting rating.
Fuse HolderRF ShieldRF Shielded/watertight panel mount fuseholders have a metal cover which eliminate possible transmission or reception of RF signals through the hole in the chassis in which the fuseholder is mounted.
Fuse HolderSafety J FuseholderDesigned by Bussmann to provide a touch-safety fuseblock for Class J fuses. These blocks can be attached together and mount on din rail. Available with and without open fuse indication.
Fuse HolderMedium Voltage Fuse MountingA mounting provides all the necessary parts to safely mount a fuse in its intended piece of equipment. The base is the metal support to which all other pieces attach. Insulators attach to the base and insulate the live fuse unit from the base and everything beyond the base. Live parts are the parts of the mounting that are energized once electricity is flowing. The live parts provide the means to hold the fuse unit in place, electrical contact, and a place to make line and load connections.
Fuse HolderDisconnect MountingThe disconnect mounting allows the fuse unit to be removed (off load) using an insulated hook stick. The hook-stick grabs a pull ring and disconnects the fuse unit, which may then be lifted out of its mounting.
Fuse HolderNon-Disconnect MountingA non-disconnect mounting does not provide a means for removing the fuse until the circuit is dead and the fuse unit can be removed manually. The fuse unit is held in place by fuse clips.
Fuse HolderClip Lock MountThe Clip Lock design provides a reliable, high-pressure contact. Mersen CL-14 fuses have copper tabs which slide into position between the clip casting and cam. When the cam is locked by moving the pull ring, a high-pressure contact is made between the clip casting and fuse tab. These clips will accommodate 5kV and 15kV CL-14 fuses rated 10E to 600E. Catalog part number is 228-700-520 for one pair of fuse clips, enough for one fuse.
Fuse HolderBolt In MountBolt-in mount Series E-rated fuses are single, double or triple barrel (3” diam.) with end mounts designed for bolting directly to equipment bus or terminal pads.
Fuse HolderFerrule MountFerrule mount fuses are ferrule-type fuses that can be mounted in standard clips. Typically for 1 and 2 barrel fuses and include R-Rated, E-Rated and PT fuses.
Fuse HolderHookeyeAn optional accessory that mounts to the upper fitting of the fuse and allows for easy installation into pole-top mountings with a hook stick. The key design feature of this hookeye provides for proper engagement of the upper live part.
Fuse HolderLive PartsLive parts include everything above the insulators on the mounting excluding the fuse unit, fuse holder, and the fuse end fittings (if required).
Standards - IECIEC 60127-2The International Electrotechnical Commision (IEC) Standard for miniature 5 x 20mm cartridge fuses. The IEC is the primary standards agency for Europe.
Standards - IECIEC 60127-2, Sheet IAn IEC fuse standard section that defines a miniature 5x20mm cartridge fuse that has 250V, quick acting and high breaking capacity characteristics.
Standards - IECIEC 60127-2, Sheet IIAn IEC fuse standard section that defines a miniature 5x20mm cartridge fuse that has 250V, quick acting and low breaking capacity characteristics.
Standards - IECIEC 60127-2, Sheet IIIAn IEC fuse standard section that defines a miniature 5x20mm cartridge fuse that has 250V, time lag and low breaking capacity characteristics.
Standards - IECIEC 60127-2, Sheet IVAn IEC fuse standard section that defines a miniature 6.3x32mm cartridge fuse that has 250V, quick acting and low breaking capacity characteristics.
Standards - IECIEC 60127-2, Sheet VAn IEC fuse standard section that defines a miniature 5x20mm cartridge fuse that has 250V, time lag and high breaking capacity characteristics.
Standards - IECIEC 60127-2, Sheet VIAn IEC fuse standard section that defines a miniature 5x20mm cartridge fuse that has 250V, time lag and enhanced breaking capacity characteristics.
Standards - IECIEC 60127-3The International Electrotechnical Commision (IEC) Standard for subminiature through-hole or surface mount electronic fuses. The IEC is the primary standards agency for Europe.
Standards - IECIEC 60127-3, Sheet IA IEC fuse standard section that defines a subminiature through-hole electronic fuse that has 125V, quick acting and low breaking capacity characteristics .
Standards - IECIEC 60127-3 Sheet IIA IEC fuse standard section that defines a subminiature axial-leaded through-hole electronic fuse that has 125V, quick acting and low breaking capacity characteristics .
Standards - IECIEC 60127-3 Sheet IIIA IEC fuse standard section that defines a subminiature through-hole mount electronic fuse that has 250V, quick acting and low breaking capacity characteristics .
Standards - IECIEC 60127-3, Sheet IVA IEC fuse standard section that defines a subminiature through-hole mount electronic fuse that has 250V, time lag and low breaking capacity characteristics .
Standards - IECIEC 60127-4The International Electrotechnical Commision (IEC) Standard for through hole and surface mount fuses. It is called the Universal Modular Fuse-Link standard (UMF) and is accepted by UL/CSA, making it the first globally accepted fuse standard. IEC 127-4 rat
Standards - IECUMF Tulip MarkThis symbol is applied to Universal Modular Fuses (UMF) that has been found to be compliant with IEC 60127-4. It is now possible to obtain a true UL Listing and European approvals for a UMF fuse.
Standards - IECUniversal Modular Fuse-linkThe International Electrotechnical Commision (IEC) Standard for through hole and surface mount fuses. It is called the Universal Modular Fuse-Link standard (UMF) and is accepted by UL/CSA, making it the first globally accepted fuse standard. The standard is IEC 60127-4.
Standards - IECIEC 60-28201An IEC standard for current limiting, medium voltage fuses.
Standards - Misc.Agency ApprovalsAn approval, as determined by an independent testing agency, certifies conformance to an appropriate standard. Meeting the requirements of a component standard, however, does not imply automatic agency approval. Such approvals must be applied for, and are only granted after satisfactory testing has been performed. To carry an Approval mark such as that issued by UL, CSA, VDE or SEMKO, a fuse or holder must be manufactured to one of the aforementioned standards. Approvals play a large part in determining a fuse or holder's suitability for a given application.
Standards - Misc.BSI - BritainThe national safety rating agency for Great Britain. BSI is an abbreviation for the British Standards Institute.
Standards - Misc.BSI Kitemark LicenseThis symbol, granted by the British agency, guarantees that a fuse has been manufactured in full compliance with the appropriate section of the IEC 60127 (BS 4265) standard. A fuse carrying a BSI approval cannot qualify for either a UL Listing or CSA Cert
Standards - Misc.CCC (China)The national safety rating mark for China. CCC is an abbreviation for China Compulsory Certificate.
Standards - Misc.CEThe CE symbol is only an identification of the conformity of guidelines in connection with the technical harmonization within the European Community. This means that the CE symbol is not a quality or standard conformity approval, but an administrative symbol.. This is valid for components with an operating voltage or rated voltage between 50VAC and 1000VAC or 75VDC and 1500VDC. The CE symbol, according to the Directive, will be shown on the fuse or holder shipping box only.
Standards - Misc.CE MarkThe CE Mark is a mandatory conformity mark for products or components placed on the market in the European Economic Area (EEA). With the CE marking on a product the manufacturer ensures that the product or component conforms with the essential requirement
Standards - Misc.CSA ApprovalThis symbol, granted by the Canadian agency, guarantees that a fuse or holder has been manufactured in full compliance with the CSA C22.2 No. 248.14 or CSA C22.2 No. 39 standard, respectively. A fuse carrying a CSA Certification cannot qualify for either a VDE or SEMKO approval.
Standards - Misc.CSA (Canada)The national safety rating agency for Canada. CSA is an abbreviation for the Canadian Standards Association.
Standards - Misc.CSA CertifiedThis symbol, granted by the Canadian agency, guarantees that a fuse or holder has been manufactured in full compliance with the CSA C22.2 No. 248.14 or CSA C22.2 No. 39 standard, respectively. A fuse carrying a CSA Certification cannot qualify for either
Standards - Misc.DenanDENAN is mandatory national law administered by the Japan's Ministry of Economy, Trade and Industry (METI). DENAN, formerly known as DENTORI, is also known as the PSE Mark. PSE is a safety approval for components used in Japan and stands for “Product Safety Electrical”.
Standards - Misc.Denan ApprovalThis symbol, granted by the Japan Electrical Testing Laboratory, guarantees that a fuse has been manufactured in full compliance with the Japanese MITI standard. This document is similar to UL 248-14 with subtle differences in voltage ratings and breaking capacity criteria.
Standards - Misc.DIN (Germany)The national standards agency for Germany. DIN is an abbreviation for the Deutsches Institut für Normung.
Standards - Misc.EN 50014A European standard governing electrical apparatus used in potentially explosive atmospheres.
Standards - Misc.EN 60079A European standard governing electrical apparatus used in potentially explosive atmospheres.
Standards - Misc.EN 50020A European Standard that contains specific requirements for construction and testing of intrinsically safe electrical apparatus, type of protection, intended for use in potentially explosive atmospheres. This supplements European Standard EN 50014, General Requirements.
Standards - Misc.GR-1089-COREA telecom equipment test standard issued by Telcordia Technologies. Defines various AC power fault and lightning surge tests that telecom equipment must withstand.
Standards - Misc.IMQ (Italy)The national safety rating agency for Italy. IMQ is an abbreviation for the Instituto Italiano del Marchio di Qualita.
Standards - Misc.JIS - JapanJapanese Industrial Standards specify the standards used for industrial activities in Japan.
Standards - Misc.METI (Japan)The national safety rating agency for Japan. METI is an abbreviation for the Ministry of Economy, Trade and Industry.
Standards - Misc.MIL SPECBroad category for various military standards that govern construction and test criteria for equipment and components.
Standards - Misc.Mil Spec FuseA fuse that is built in accordance with a particular military specification (ie MIL-STD 202).
Standards - Misc.MIL STD-202Military standard for fuses used in Instrumentation applications.
Standards - Misc.MIL STD-PRF-15160Military standard for fuses used in Instrumentation, Power, and Telephone applications.
Standards - Misc.MIL STD-PRF-23419Military standard for fuses used in Instrumentation applications.
Standards - Misc.MSHAMine Safety & Health Administration. U.S. Federal enforcement agency responsible for the health and safety of the nation's miners.
Standards - Misc.NECAn abreviation for the National Electric Code. The National Electrical Code, or NFPA 70, is a United States standard for the safe installation of electrical wiring and equipment. It is used nationally and internationally as the basis for safeguarding persons, buildings, and their contents from hazards arising from the use of electricity. The Code contains those provisions considered necessary for safety and thus is widely used as a basis for legal enforcement in the installation of electrical conductors and equipment in buildings and certain other premises.
Standards - Misc.RoHSA component that is compliant with the various regional environmental laws and regulations that call for the reduction or removal of specific toxic materials used in the manufacturer of products. RoHS stands for Reduction of Hazardous Substances.
Standards - Misc.RoHS-6The European Union’s Directive 2002/95/EC is known as RoHS, for “restriction of hazardous substances.” It requires the EU member states to ban, starting July 1, 2006, the use of six substances - lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium (Cr6+), polybrominated biphenyls (PBB), and polybrominated diphenyl ethers (PBDE) - in new electrical and electronic equipment, except in specified exemptions (which are periodically reviewed). An extensive range of circuit protection components are RoHS-6 compliant.
Standards - Misc.SAESociety of Automotive Engineers. Issues standards for automotive-related components.
Standards - Misc.SAE J1284The Society of Automotive Engineer's (SAE) standard for medium size automotive blade (ATO, ATC, etc) and glass fuses.
Standards - Misc.SAE J1888The Society of Automotive Engineer's (SAE) standard for large size automotive blade fuses (MAXI, etc).
Standards - Misc.SAE J2077The Society of Automotive Engineer's (SAE) standard for miniature size automotive blade fuses (MINI, ATM, etc).
Standards - Misc.SEMKO (Sweden)The national safety rating agency for Sweden. SEMKO is an abbreviation for the Svenska Elektriska Materiaelkrontrollanstalten.
Standards - Misc.SEMKO ApprovalThis symbol, granted by the Swedish agency, guarantees that a fuse or holder has been manufactured in full compliance with the appropriate section of the IEC 60127 standard. A fuse carrying a SEMKO approval cannot qualify for either a UL Listing or CSA Certification.
Standards - Misc.VDEThe national safety rating agency for Germany. VDE is an abbreviation for the Verband Deutscher Elektrotechniker.
Standards - Misc.VDE ApprovalThis symbol, granted by the German agency, guarantees that a fuse or holder has been manufactured in full compliance with the appropriate section of the IEC 60127 standard. Until recently, a fuse carrying a VDE approval could not qualify for either a UL Listing or CSA Certification.
Standards - Misc.TUVA German government approved independent testing agency. TUV perfroms testing and grants certification in accordance to the IEC/EN specifications.
Standards - Misc.ANSI C37.46-2000This standard establishes specifications for high voltage (above 1000 volts) expulsion and current-limiting type power class fuses and accessories.
Standards - Misc.ANSI C37-41This standard provides the design tests for high-voltage (1000 volt or more) fuses, fuse and disconnecting cutouts, distribution enclosed single-pole air switches, fuse disconnecting switches, and accessories for use on ac power and distribution systems.
Standards - Misc.DIN 43 625The International Standard for IEC style High voltage current limiting fuses with Voltage Ratings from 3.6kV to 36kV.
Standards - ULUL 248-12, Class RK5This approval is similar to CSA Certification. Since UL is accredited by the Standards Council of Canada as a Certified Organization and Testing Organization, it can perform component testing to applicable Canadian standards. This approval guarantees full
Standards - ULc-UL RecognitionThis approval is similar to that offered by the CSA Component Acceptance Program. If basic Canadian safety requirements are met during testing and the component performs as the manufacturer predicts it can be c-UL Recognized. As with UL Recognition, "Conditions of Acceptability" are listed in the test report.
Standards - ULc-UL-us ListingThis approval combines the UL Listing and c-UL Listing into a single approval valid for the U.S. and Canada. This approval guarantees full compliance with the selected component standards.
Standards - ULc-UL-us RecognitionThis approval combines the UL Recognition and c-UL Recognition into a single approval valid for the U.S. and Canada. As with UL Recognition, "Conditions of Acceptability" are listed in the test report.
Standards - ULUL 248~The Underwriter Laboratories (UL) standard for low-voltage fuses rated 1000V or less, AC and/or DC, with interrupting ratings up to 300 kA.
Standards - ULUL 248 Special Purpose FusesThe Underwriter Laboratories (UL) standard for any fuse type or style that does not comply with other relevent sections of UL 248. This is the "catch-all" section of the UL 248 fuse standard.
Standards - ULUL 248-10, Class LThe Underwriter Laboratories (UL) standard for Class L power fuses.
Standards - ULUL 248-12, Class RK1The Underwriter Laboratories (UL) standard for Class RK1 and RK5 power fuses.
Standards - ULUL 248-12 Class RK5This approval is similar to CSA Certification. Since UL is accredited by the Standards Council of Canada as a Certified Organization and Testing Organization, it can perform component testing to applicable Canadian standards.
Standards - ULUL 248-14The Underwriter Laboratories (UL) standard for supplemental protection electronic fuses including cartridge types (3AG, 5x20mm, etc), subminiature types (pico, TR5, etc) and surface mount types.
Standards - ULUL 248-15, Class TThe Underwriter Laboratories (UL) standard for Class T power fuses.
Standards - ULUL 248-4, Class CCThe Underwriter Laboratories (UL) standard for Class CC power fuses.
Standards - ULUL 248-5, Glass GThe Underwriter Laboratories (UL) standard for Class G power fuses.
Standards - ULUL 248-6, Class HThe Underwriter Laboratories (UL) standard for Class H non-renewable power fuses.
Standards - ULUL 248-7, Class HThe Underwriter Laboratories (UL) standard for Class H renewable power fuses.
Standards - ULUL 248-8, Class JThe Underwriter Laboratories (UL) standard for Class J power fuses.
Standards - ULUL 248-9, Class K5The Underwriter Laboratories (UL) standard for Class K power fuses.
Standards - ULUL 2579The Underwriter Laboratories (UL) standard for Photovoltaic (Solar) Systems rated up to 1500V DC.
Standards - ULUL 275AThe Underwriter Laboratories (UL) standard for medium size automotive blade fuses (ATO, ATC, etc).
Standards - ULUL 489 ListedThe Underwriter Laboratories (UL) standard for Molded-Case Circuit Breakers, Switches and Circuit-Breaker Enclosures. Branch Circuit Breakers are UL 489 Listed and are classified as a final overcurrent device dedicated to protecting the branch circuits and outlets. They do not require an additional "back up" overcurrent device in the circuit.
Standards - ULUL 489AThe Underwriter Laboratories (UL) standard for Molded-Case Circuit Breakers, Switches and Circuit-Breaker Enclosures used in communications equipment.
Standards - ULUL 508 RecognizedThe Underwriter Laboratories (UL) standard for Industrial Control Equipment. It covers industrial control devices for starting, stopping, regulating, controlling, or protecting electric motors. This equipment is for use in ordinary locations in accordance with the National Electrical Code, NFPA 70.
Standards - ULUL 508AUL508A is the standard for Industrial Control Panels for general industrial applications.
Standards - ULUL ListedUnderwriter Laboratories' approval mark guaranteeing that a component has been manufactured and tested in full compliance with the relevant UL standard.
Standards - ULUL ListingThis symbol, granted by the U.S. agency, guarantees that a fuse has been manufactured in full compliance with the UL 248-14 standard. A fuse carrying a UL Listing cannot qualify for either a VDE or SEMKO approval.
Standards - ULUL RecognitionUL's Component Recognition Program allows the testing of components (including fuses and holders) for which no UL standard exists or where only certain sections of a particular UL standard are referenced. A fuse or holder may be submitted to UL for testing according to criteria defined by the manufacturer. If basic safety requirements are met during testing and the component performs as predicted, it can be UL Recognized. Fuses built to the European IEC 60127 fuse standard (with SEMKO, VDE, and/or BSI approvals) are technically qualified to apply for UL Recognition.
Standards - ULUL RecognizedUnderwriter Laboratories Component Recognition Program allows for the testing of components for which no UL standard exists or where the manufacturer only wants to test to certain sections of a UL standard or other agency standard. The UL Recognition approval mark guarantees that a component has been manufactured and tested in compliance with specific sections of the manufacturer-selected standard.
Standards - ULUL Recognized (1801)UL Recognition (investigated to UL 1801) as a telecom-duty fused disconnect switch for the interruption of load current by means of withdrawing the fuse pullout.
Standards - ULUL Recognized Standard 1077The Underwriter Laboratories (UL) standard for Supplemental Protectors (includes circuit breakers). The standard covers components which are incomplete or restricted in performance capabilities by themselves but will later be used in complete end products, equipment or systems that are Listed by UL.
Standards - ULUL/CSA VS. IECThere are significant differences between the requirements listed in the UL 248-14/CSA 248.14 standard and the IEC 60127 standards. Whereas, both documents have much in common when describing physical dimensions and materials used in construction, they completely contradict each other defining pre-arcing time vs. current characteristics of fuses. This incompatibility alone makes it impossible to build an electronic fuse that fully complies with all of these standards. Knowledge of these fundamental differences will enable the design to properly select an approved fuse type for any given application. Since the fuse is one of the last items selected in the design, this knowledge can be a time-saver during product approval.
Standards - ULUL 1449The Underwriter Laboratories (UL) standard for Transient Voltage Suppressors
Standards - ULUL 1414The Underwriter Laboratories (UL) standard for across the line capacitors, antenna coupling and line by-pass capacitors for radio and television type appliances
Standards - ULUL 1500The Underwriter Laboratories (UL) standard for products and components classified as ignition protected for marine electrical and fuel systems.
Standards - ULUL 497BThe Underwriter Laboratories (UL) standard for protectors for data and communication and fire alarm circuits.