Siemens Circuit Breaker, AFCI, GFCI, 120 V, 20 A, 1 ph, 1 Pole, 10 kA Interrupt, Magnetic, Thermal Actuator, Instantaneous, Non-Interchangeable Trip, Trip Sensitivity: 5 mA, 12 to 8, 14 to 8 AWG Wire, Lug Terminal, Plug Mounting, Black, Dimensions: 3 in W x 1 in D x 4-1/2 in H