Tin-plated copper stab to create a reliable, permanent and corrosion-resistant connection. Ensures its ground circuitry is functioning properly by automatically running diagnostic testing on a periodic basis. Should a problem be detected, the circuit breaker will trip and will need to be replaced. Unit provides protection against overloads, short circuits and ground faults. Class A 5 mA ground fault circuit interrupter. Wire range is #14 - 8 AWG CU/#12 - 8 AWG AL. UL listed. 4-1/2 in H x 1-1/4 in W x 3 in D, 0.479 lb.