Product Details: Outfit your semi truck to be Ready for the Road Ahead™ with a rapid reset of electrical circuits, with the Littlefuse 12V / 50A Automatic Reset Chassis Mount Circuit Breaker. Due to its ability to reset itself after a breaker is tripped, this replacement device is able to restore a vehicle's electrical system to its original working condition. Constructed with high amperage protection in a tight space for increased design flexibility. FleetPride is your First Click in Heavy Duty®.