This Siemens 15 A rated GFCI 1-pole circuit breaker features a self-test function. If the breaker detects that it has been compromised, it trips itself and locks in this position so that it can't be reset. It also features protection against ground-fault protection. The breaker is CSA licensed for HACR-type equipment (Heating, Air Conditioning & Refrigeration). Typical applications for a single pole 15 A breaker include lighting and receptacle circuits in a home and requiring a wire size of 14-2. The breaker provides overload and short circuit protection (120 V AC).