The Cole Hersee 75920 master battery disconnect switch cuts off all battery power from a vehicle’s electrical system. The device also provides an emergency power cutoff, protecting vehicles from tampering, theft and battery drain. The switch’s composite-engineered polymer housing is made to resist corrosion. It has an amperage capacity of 300 amps at 12-volt DC, can be used in high-side or low-side applications and fits the standard master disconnect switch mounting pattern. The switch has a large red knob designed for operation with gloved hands, and 90-degree switch travel.