Cutler-hammer circuit breaker, ground fault, type GFCI, 120/240 vac, 20 a, 10 kaic interrupt, 1 poles, 14 - 4 AWG wire, Plug-on mounting, 1 in space. Automatically senses hot wire-to-ground faults and shuts off the power. Auto-monitoring function provides periodic automatic testing of GFCI. If the self-test detects that GFCI protection might be compromised it indicates an alert.10 kaic capacity.