The Square D by Schneider Electric Homeline 20 Amp One-Pole GFCI circuit breaker is designed for overload and short-circuit protection, combined with Class A ground fault protection. Class A denotes a ground fault circuit interrupter that will trip when a fault current to ground is 6 milliamperes or more. This breaker is compatible with Homeline load centers and CSED devices. The ANSI-certified and UL-listed unit is rated for 120 VAC and 10,000 AIR.Homeline circuit breakers are built with the same Square D brand quality you have come to expect at a price that makes them the best value in their class.