Must Have Battery Disconnect Switch: The battery disconnect switch protects everything from cars to boats to semi-trucks with this button and handles 12V up to 125A continuous and 500A momentary current. It's ideal for cars, boats, trucks, RVs, and electrical appliance batteries. Handles 12V up to 12V 125A DC and 500A momentary current. This switch adapts to the slightly smaller negative terminal of all standard sized car batteries. Ideal for cars, boats, trucks, RVs, and more. This extremely convenient disconnect switch makes it quick and easy to disconnect your car battery for maintenance, safety, servicing, or storage. Easy to use. install and easy to use. To turn on the power, simply tighten the green knob and loosen it slightly to disconnect all power. The battery switch weighs 120g.