Product Details: Get your semi Ready for the Road Ahead™ with enhanced control of its electrical system, with the Cole Hersee 6-36V 2-Position Battery Master Disconnect Switch. With a streamlined design, this replacement switch works to quickly shut off the electricity to a battery. Manufactured to protect against parasitic loads and overheating, while ensuring shutdown in case of an emergency. FleetPride is your First Click in Heavy Duty®.