75920 Series - 36V Master Battery Disconnect Switch

Series: 75920
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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.

Keep service personnel safe and protect the battery and electrical systems in your emergency vehicle, tractor, heavy-duty truck, or boat with the 75920 Series 36V Master Battery Disconnect Switch.

The heavy-duty battery disconnect switch ensures the safety of service professionals by disconnecting the battery from the vehicle electrical system, safeguards against battery drain from parasitic loads, and features built-in lock-out/tag-out for tampering and theft prevention.

As an IPX8-rated waterproof battery disconnect switch, it is ideal for a wide range of vehicles, including construction equipment, heavy-duty trucks, boats, and vehicles operating in harsh conditions, such as snowplows and snow removal equipment. Fitting a standard master disconnect mounting pattern, the 75920 series can be used as a drop-in replacement.

With a large knob that makes manual operation simple, plus clear switch position markings and 90° switch travel, the high-amp battery disconnect can effectively be used as a manual emergency power cutoff switch.

Features and Benefits

  • High amperage continuous current capacity of 400A with a single 4/0 cable at 12V dc, 300A at 24V dc, or 200A at 36V dc
  • IPX8-rated waterproof battery disconnect switch for external mounting on vehicles as well as installation on boats and marine equipment
  • Can be used in high-side or low-side applications
  • Black or gray thermoplastic housing with a UL 94 V-0 rating
  • Tested per SAE J1455 for salt, calcium chloride, and magnesium chloride, delivering a rust- and corrosion-free high-amp battery disconnect
  • Large red, yellow, or black knob makes the master battery disconnect switch easy to operate while wearing gloves, and the 90° switch travel makes it simple to identify the switch position
  • Built-in lock-out/tag-out (LOTO) satisfies OSHA requirements for an energy isolation device
  • Large divider on the base prevents accidental shorting of high energy cables


  • Heavy-Duty Truck
  • Construction
  • Agricultural Equipment
  • Material Handling
  • Mining
  • Off-Road Vehicles
  • Emergency Vehicles
  • Marine

Access specifications, certifications, check availability and order parts below

Catalog #Current Rating (Continuous) in AmpsCurrent Rating (Inrush) in AmpsVoltage Rating MaxCircuitryIngress ProtectionActuatorContact MaterialHousingAgency Approval - ShockPart DatasheetSamplesCompare
75920400300036SPSTIP68Red KnobCopperEngineering ThermoplasticPartOrder
75920-10-BX400300036SPSTIP68Red KnobCopperEngineering Thermoplastic 
75920-01400300036SPSTIP68Yellow KnobCopperEngineering ThermoplasticTested to SAE J1455PartOrder
75920-03400300036SPSTIP68Red KnobCopperPlated Steel Order
75920-05400300036SPSTIP68Red KnobCopperEngineering ThermoplasticTested to SAE J1455 Order
75920-05-BX400300036SPSTIP68Red KnobCopperEngineering Thermoplastic Order
75920-10400300036SPSTIP68Red KnobCopperEngineering Thermoplastic Order
75920-BP400300036SPSTIP68Red KnobCopperEngineering Thermoplastic Order
75920-BX400300036SPSTIP68Red KnobCopperEngineering Thermoplastic Order
75921400300036SPSTIP68Red KnobCopperEngineering ThermoplasticTested to SAE J1455 Order
75921-02400300036SPSTIP68Black KnobCopperEngineering ThermoplasticPartOrder
75921-10400300036SPSTIP68Red KnobCopperEngineering ThermoplasticTested to SAE J1455PartOrder
75921-10-BX400300036SPSTIP68Red KnobCopperEngineering ThermoplasticPartOrder

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Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
75920 SW ROT MAST DISC 2POS PLSTC RoHS No 09/30/2013 PbFree No 09/30/2013 CoC_RoHS10_75920 REACH209_Declaration_75920
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