Equip your semi truck to be Ready for the Road Ahead , with the Cole Hersee 12V 200A Continuous Duty Solenoid Relay, a key component that ensures precise control of mechanical components. Thanks to its ability to operate off of electromagnetic actions, this replacement piece is the ideal solution to monitor processes such as engine ignition, fuel injection, braking, and more. Constructed with heavy duty and durable contacts to withstand high current loads. FleetPride is your First Click in Heavy Duty .