Square D by Schneider Electric Homeline 20 amp 1-pole Dual Function Circuit Breaker is a space and labor saving device, engineered to meet prevailing National Electric Code requirements. This device combines 2 critical technologies, Combination Arc Fault protection and ground fault protection (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. 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.