QO ground Fault Circuit Interrupters (GFCIs) combine the same level of overcurrent circuit protection as standard QO Circuit Breakers, with ground fault protection for personal protection against electrical shock. GFCI protection is required in wet or damp areas such as bathrooms, kitchens, garages, spas, pools and outdoor receptacles. Do not connect to more than 250 feet of load conductor for the total one-way run to prevent nuisance tripping. The exclusive QO Visi-Trip instantly identifies a tripped circuit breaker with a red indicator window. Provides overload, short circuit protection combined with Class A ground fault protection. Class A denotes a GFCI that will trip when a fault current to ground is 5 milliamps or more. Yellow push to test button.