Battery disconnects improve safety and security of stored vehicles, RVs and seasonal equipment. The Battery Doctor Rotary Switch is a battery disconnect that mounts on the negative battery side so disconnecting and reconnecting the battery is quick and easy. Be safe. Use a battery disconnect to stop unwanted battery drain and help prevent theft, unauthorized use or tampering.. Master battery isolator disconnect switch. 100A continuous @ 12V. 500A surge @ 12V. Requires. 75" hole for mounting. RoHS compliant