*[Compatibility]: This rotary battery disconnect switch is only suitable for the top terminal and negative terminal of the battery. Maximum current: 500A, rated current: 100A. 6v 12v 24V batteries for cars, trucks, buses, RVs, boats, and trailers * Top Heavy Duty : This rotary battery disconnect switch is made of brass material, which is corrosion-resistant, has good conductivity, is good and safe to use *Easy to install: This knob type battery is easy to install and use. Switch raised 90 °power off state, switch lowered 90 ° -power on state * Power saving : This type main switch is used for battery isolation and protection of electrical systems, eliminating any power consumption of the battery when the vehicle or vessel is not in use, stopping unnecessary battery depletion, and preventing theft or unauthorized use. * Widely Used : Widely used in batteries for cars, trucks, ships, or RVs, it can also be used as a key for various electrical devices added inside and outside the car (such as flashing lights, chassis lights, fog lights, roof lights, instant power outage equipment, etc.)