956 Heavy Duty Series - Diesel Ignition and Start Switch

Series: 956 Heavy Duty
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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

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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