Battery Doctor Rotary Switch 20304 100A 12V 500A Surge

Master Battery Isolator 20304

The Battery Doctor 20304 is a rotary master battery isolator designed for 12V vehicle electrical systems. It mounts on the negative battery terminal to provide a quick, manual disconnect. The switch carries 100A continuous current and withstands a 500A surge at 12V. It requires a 75mm mounting hole and meets RoHS compliance.

Vehicle Owners Needing Simple Isolation

This switch suits owners of stored cars, RVs, or seasonal equipment who want to prevent parasitic battery drain and deter unauthorised use or theft. It offers a straightforward mechanical break without electronic complexity. Buyers needing remote operation, automatic low-voltage cutoff, or integration with an alarm system should look at electronic isolators instead.

100A Continuous With 500A Surge Headroom

The 100A continuous rating comfortably handles typical vehicle accessory loads and starting circuits for small to mid-size engines. The 500A surge capacity provides headroom for brief inrush currents during engine cranking. Systems drawing more than 100A continuously or requiring sustained high-current winch operation will exceed the switch's thermal limits.