1,Powerful Function: 2?position 2?stud single circuit battery switch, switches a single battery to a single load group. Ideal for marine or RV applications. 2,Stable Performance: 300A battery switch is used to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely. 3,Good Conductivity: Isolating ABS plastic shell and red copper plated silver inner core for maximum electronical conductivity. 4,Flexible Installation: Safe ignition protection for installation aboard gasoline powered boats. Case design allows surface, front panel, or rear panel mounting. 5,Circuit Identification: Label with international ON or OFF, IP66 protection. Widely used for car, marine, boat, RV, camper, travel trailer, truck, ATV, UTV, battery banks and other devices.