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 at least. Calibration: Breaker will continuously carry 100% of rated load. It may trip between 101% and 144% of rated load, but must trip at 145% at 25º C. Dielectric Strength: Over 1,500 volts RMS. Max. Operating Voltages: 50VDC, 250VAC. Interrupt Capacity: 2,000 Amps, at 50. VDC(1-30 amp Models) 1,000 Amps, at 250VAC (1-30 amp Models)