75921-02 - 75920 Series Master Battery Disconnect Switches Series

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 with I/O Markings and Black Knob (75921-02).

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, black knob that makes manual operation simple, plus clear I/O 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

  • Black knob with white pointer
  • I/O switch position markings in white on a black plastic bezel
  • Gray thermoplastic housing with UL 94 V-0 flammability rating
  • 18 mm x 1.5 zinc mounting stem
  • M10 x 1.5 copper stud
  • Stainless steel hex nut
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Product Literature


Property (Mouseover for details) Value
Current Rating (Continuous) in Amps 400
Current Rating (Inrush) in Amps 3000
Voltage Rating (Max) 36
Circuitry SPST
Ingress Protection IP68
Actuator Black Knob
Contact Material Copper
Housing Plated Steel
Mounting stem 18mm x 1.5
To request product environmental information, please complete the Product Environmental Information Request Form.