The Single Pole 15 Amp Homeline GFI plug-on circuit breaker protects against electrical shocks. It 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. GFCI protection is required in wet or damp areas such as bathrooms, kitchens, garages, spas, pools and outdoor receptacles. It has a yellow push to test button, 10,000 Amperes Interrupting Rating (AIR) and measures 3" x 1" x 4.25".