Electronic devices needed by fire trucks include dc motor controls for pumps and ladders, solenoids for emergency lights, and ESD protection to









Cut all battery power to vehicle electrical systems with the TR Series 32V 500A 2-Pole Waterproof Master Battery Disconnect Switch. The dual-pole, single-throw (DPST) switch works in heavy-duty truck, construction, emergency vehicle, bus and transit, military, and agricultural applications requiring the switching of two circuits or both positive and negative.
You can feel confident mounting this master battery disconnect switch in exposed locations thanks to its IP67 and IPX9K waterproof and dustproof ratings as well as its high shock and vibration tolerance.
The dual battery disconnect switch can be used to disconnect one or two batteries in either the positive or negative line, and it can be used to switch two vehicle voltage circuits simultaneously (24V and 12V).
Integrated lock-out/tag-out (LOTO) capability in either the on or off position using a padlock or hasp (not included) helps ensure personnel safety and vehicle security.
- Maximum continuous current of 500 A per circuit with two 4/0 input and two 4/0 output cables
- IP67 and IPX9K waterproof and dustproof ratings enable mounting in exposed locations on the vehicle
- Drop-in replacement for competitive master disconnect switches when you need higher vibration (8 G) and shock (30 G) capabilities
- Drop-in replacement for competitive master disconnect switches when you need higher vibration (8 G) and shock (30 G) capabilities
- Available with a black, yellow, or red knob
- Four tin-plated copper M12 x 25 mm terminal studs
- Two holes for M8 or 5/16" mounting
TR Parts
Filters
Part Number | Actions | Current Rating (Continuous) in Amps | Voltage Rating (V) | Circuitry | Ingress Protection | Actuator | Contacts | Housing | Agency Approval - Vibration |
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Part Number | Actions | Current Rating (Continuous) in Amps | Voltage Rating (V) | Circuitry | Ingress Protection | Actuator | Contacts | Housing | Agency Approval - Vibration | |
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500 | 48 | DPST | IP67, IP69K | Black Knob | Silver Plated Copper | Engineering Thermoplastic | 8 G | |||
500 | 48 | DPST | IP67, IP69K | Red Knob | Silver Plated Copper | Engineering Thermoplastic | 8 G | |||
500 | 48 | DPST | IP67, IP69K | Yellow Knob | Silver Plated Copper | Engineering Thermoplastic | 8 G | |||
500 | 48 | DPST | IP67, IP69K | Black Knob | Silver Plated Copper | Engineering Thermoplastic | 8 G |
TR Applications


Surface and underground mines cannot produce unless excavators, bulldozers, tractor scrapers, and dump trucks operate consistently, efficiently,
Highlights Section
- Heavy Trucks
- Construction
- Emergency Vehicles
- Bus/Transit
- Military
Series: TR Resources

Littelfuse-Commercial Vehicle Catalog
Find electronic components for trucks, buses, and construction, agricultural, marine, material handling, recreational, and marine vehicles.