Dewhel Dual Battery Selector Switch 1-2-Both-Off Selector for Marine Boat Rv Vehicles Selector 4 Position: 1-2-Both-Off Selector 4 Position. Switches isolated battery banks to all loads or combines battery banks to all loads Voltage: 8V - 50V DC ,Rating: 200A Continuous, 1000A Momentary at 12V DC Widely used for Car, Marine, Boat, RV, Camper, Truck, ATV, UTV, Battery banks and other 0-50V Devices. Base: 2.85" x 2.85" (72.5mm x 72.5mm) ,Height: 2.90" (73.5mm)