Product Details: Renovate your semi with components with Expertise Built In™, with the OTR 48V 50A-Hi-Amp Circuit Breaker that offers advanced electrical system protection. Due to its advanced design, this replacement component is able to automatically cut the power in a circuit when an excess flow of amps is detected, preventing potential damage or overheating in various devices. Constructed with simple controls that allow for manual resetting unlike traditional fuse boxes that require new components each reset. FleetPride is your First Click in Heavy Duty®.