956 Heavy Duty Series - Diesel Ignition and Start Switch

Series: 956 Heavy Duty
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Littelfuse Ignition Switches are designed for universal applications within harsh environments. Their mounting, body, and actuator features are designed for ease-of-use and extended product lifecycle.

The 956 Heavy Duty Series is our most robust series of Ignition Switches, providing reliable circuit control for vehicle ignition.

Features and Benefits
  • Key removable in “Off” Position Only (where actuator applicable)
  • Ignition Proof to SAE J259
  • 5 screw terminals.
  • Coded lock & keys.
  • Gasket-sealed, Shutter lock seal, O-ring seal in stem.
  • Ground terminal.
  • 1"-24 bushing.
  • Off-Ign/Acc-Ign/Start. Spring return to Ign/Acc. Key removable at Off.
  • Ratings at 12V DC: 10A Accessory, 10A Ignition, 5A Start, 1A Ground.

Product Literature

Access specifications, certifications, check availability and order parts below

Catalog #Current Rating (Continuous) in AmpsNumber of PositionsPositionsActuatorInput TerminalsHousingContact MaterialRecommended TorqueCompare
956-3122103Off - Ign/Acc - Start with Spring Return to Ign and Start Lockout5 screwPlated Steel with O-Ring in StemBronze
956-3122-BX3Off - Ign/Acc - Start with Spring Return to Ign and Start Lockout5 screwO-Ring in Stem
956-3124103Off - Ign/Acc - Start with Spring Return to Ign and Start LockoutShort Lever5 screwPlated Steel with O-Ring in StemBronze
956-3124-BX3Off - Ign/Acc - Start with Spring Return to Ign and Start LockoutShort Lever5 screwO-Ring in Stem
956-3125303Off - Ign/Acc - Start with Spring Return to Ign and Start Lockout4 screwPlated SteelBronze
956-3125-BX3Off - Ign/Acc - Start with Spring Return to Ign and Start Lockout4 screw
956-3126103Off - Ign/Acc - Start with Spring Return to Ign and Start LockoutHencol Key4 screwPlated SteelBronze
956-3126-BX3Off - Ign/Acc - Start with Spring Return to Ign and Start LockoutHencol Key4 screw
956-3127103Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartShort Lever3 screwPlated Steel with O-Ring in StemBronze
956-3127-BX3Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartShort Lever3 screwO-Ring in Stem
956-31353Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartLever5 ScrewO-Ring in Stem
956-4100104Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartKey4 bladePlated SteelBronze
956-4100-BX4Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartKey4 blade
956-4104104Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartKey4 screwPlated SteelBronze
956-4104-BX4Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartKey4 screw
956-4107104Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartHencol Key4 screwPlated Steel with O-Ring in StemBronze
956-4107-BX4Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartHencol Key4 screwO-Ring in Stem
956-4111104Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartShort Lever4 bladePlated SteelBronze
956-4111-BX4Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartShort Lever4 blade
956-4113304Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartHencol Key4 bladePlated Steel with O-Ring in StemBronze
956-4124104Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartShort Lever4 screwPlated Steel with O-Ring in StemBronze
956-4124-BX4Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartShort Lever4 screwO-Ring in Stem
956-4138204Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartKey4 bladePlated SteelCopper
956-4138-BX4Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartKey4 blade
956-4141204Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartHencol Key4 screwPlated Steel with O-Ring in StemCopper
956-4141-BX4Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartHencol Key4 screwO-Ring in Stem
956-4154104Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartKey5 screwPlated SteelCopper
956-4154-BX4Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartKey5 screw
956-4307104Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartHencol Key4 screwPlated Steel with O-Ring in StemBronze
956-4307-BX4Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartHencol Key4 screwO-Ring in Stem
956-4311104Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartKey4 bladePlated SteelBronze
956-4311-BX4Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartKey4 blade
956-5109303Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartMilitary Lever4 screwPlated SteelSilver
956-5109-BX3Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartMilitary Lever4 screw
956-5124103Off - Ign/Acc - Start with Spring Return to Ign and No Anti-RestartHencol Key4 screwPlated Steel with O-Ring in StemSilver
956-5307103Off - Ign - Start with Spring Return to Ign and No Anti-RestartHencol Key3 screwPlated Steel with O-Ring in StemBronze
956-5307-BX3Off - Ign - Start with Spring Return to Ign and No Anti-RestartHencol Key3 screwO-Ring in Stem
956-6307103Acc - Off - Ign/Acc without Spring Return or Anti-RestartHencol Key3 screwPlated Steel with O-Ring in StemBronze
956-6310303Acc - Off - Ign/Acc without Spring Return or Anti-RestartHencol Key3 screwPlated Steel with O-Ring in StemBronze
956-9100104Mom Fuel - Off - Ign/Acc - Start with Spring Return to Ign/Acc and Spring Return to Off from Fuel and No Start LockoutHencol Key5 screwPlated Steel with O-Ring in StemBronze
956-9100-BX4Mom Fuel - Off - Ign/Acc - Start with Spring Return to Ign/Acc and Spring Return to Off from Fuel and No Start LockoutHencol Key5 screwO-Ring in Stem
956-3126-BP103Hencol Key4 ScrewPlated SteelBronzeOff - Ign/Acc - Start with Spring Return to Ign and Start Lockout


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    • 956 Heavy Duty
      Diesel Ignition and Start Switch

    • Current Rating (Continuous) in Amps: 10, 20, 30

    • Number of Positions: 3, 4

    • Positions: 3, Acc - Off - Ign/Acc - Start with Spring Return to Ign and No Anti-Restart, Acc - Off - Ign/Acc without Spring Return or Anti-Restart, Mom Fuel - Off - Ign/Acc - Start with Spring Return to Ign/Acc and Spring Return to Off from Fuel and No Start Lockout, Off - Ign - Start with Spring Return to Ign and No Anti-Restart, Off - Ign/Acc - Start with Spring Return to Ign and No Anti-Restart, Off - Ign/Acc - Start with Spring Return to Ign and Start Lockout

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