An SCR is a solid state uni-directional, half-wave silicon switch. SCRs are Silicon Controlled Rectifiers. SCRs are normally open (high impedance) circuits, capable of withstanding a rated blocking voltage until triggered to an on state. Once triggered, SCRs become a low impedance current path until the main current either stops or drops below a minimum holding current. Sensitive SCRs are designed for interfacing to integrated circuits or in applications where high current load requirements and limited gate drive capabilities exist. Sensitive SCRs are easily triggered with current supplied by sense coils, proximity switches and microprocessors. Standard SCRs are used in circuits where high surge currents or latching action is necessary. They are also used for half-wave type circuits where gate-controlled rectification action is needed.
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