Square D Neutral Plug-On Dual Function circuit breakers are a space and labor saving device, engineered to meet prevailing National Electric Code requirements. This device combines two technologies: Combination Arc Fault protection and Ground Fault protection in a single, easy to install device. NEC code now requires both combination arc fault and ground fault protection on all single pole 15 and 20 amp kitchen and laundry circuits. Prior to the release of this new device, a contractor'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 two separate devices to provide essential protection.