The Square D QO 20 Amp 1-pole Dual Function Circuit Breakers is a space and labor saving device, engineered to meet prevailing National Electric Code requirements. This device combine 2 critical technologies, Combination Arc Fault protection (CAFCI/CAFI) and Ground Fault protection (GFCI/GFI - class A), in a single, easy-to-install device. The National Electric Code now requires both Combination Arc Fault and Ground Fault protection on all 1-Pole, 15 Amp and 20 Amp kitchen and laundry circuits. Prior to the release of this new device, a contractor or homeowner's only choice would have been to use a Combination Arc Fault circuit breaker in conjunction with an expensive, bulky Ground Fault receptacle. The new Dual Function circuit breakers help reduce cost and eliminate the hassle of using 2 separate devices to provide this essential protection. This breaker is only compatible with Square D's QO electrical panels and CSEDs with available space for a 1-pole breaker. It's a win for contractors and homeowners alike. Like all Square D CAFI Circuit Breakers, it is integrated with time saver Diagnostics, a unique feature that provides additional circuit information and minimizes troubleshooting at the touch of a button. This breaker is also designed for residential and single phase commercial uses.