Philmore 50A Push Button Manual Reset Thermal Circuit Breaker 50V DC, 125V AC Philmore circuit breakers are single pole, thermal circuit breakers that feature a recessed reset button which cannot be manually pulled out to disconnect the circuit. When an overload occurs and the breaker opens, it allows the reset button to pop out for visible trip indication. The recommended mounting hole is 0.437" (7/16") Philmore circuit breakers are UL 1077 recognized as supplementary protectors, File E99607, and CSA Certified as appliance Components protectors, File LR62590 Endurance: 1,000 times minimum