Bussman
Littelfuse
Wickmann

Electronic Fuses

Bussmann
Littelfuse
Schurter
Wickmann
Ferraz Shawmut

Industrial Fuses

Bussmann
Littelfuse
Ferraz Shawmut
General Electric
Siba

European (IEC) Fuses

Bussmann
Littelfuse
Schurter
Siba
Wickmann
Ferraz Shawmut

Military Fuses

Bussmann

Littelfuse

Metal Oxide Varistors (MOV's)

Littelfuse (Formerly Harris) 
Ferraz Shawmut
Bussmann

ESD Suppressors, TVS Diodes
Gas Plasma Protectors

Bussmann
Littelfuse (Formerly Simitron)

Thyristors and Sidactors

Littelfuse (Formerly Teccor)

Switches

Schurter
Carling Technologies
Eaton / Heinemann

EMI/RFI Filters

Schurter
Power Dynamics

PTC Resettable Devices

Littelfuse
Schurter
Wickmann

Surface Mount Fuses

Bussmann
Littelfuse / Teccor
Schurter
Wickmann
AEM, Inc.

Semiconductor Fuses

Bussmann
Littelfuse
Ferraz Shawmut
Siba

Cable Ties & Wiring Accessories

Panduit

Circuit Breakers

Carling Technologies
Eaton / Heinemann
Airpax
Schurter
CBI

Fans & Blowers

Interfan

Power Cords and Cordsets

Schurter
Feller
Volex (Formerly Belden)
Power Dynamics

Power Entry Modules

Schurter
Power Dynamics

Terminal and Distribution Blocks

Bussmann
Magnum
Ferraz Shawmut

Indicators

Schurter
LC&D (Formerly LittleLite)

Thermal Sensing Products

Airpax