Square D Homeline 15 Amp 2-pole Combination Arc Fault Circuit Interrupters (CAFI) help keep people and property safe from the effects of dangerous arcing. These arcs typically occur out of sight; inside walls or electrical devices, day or night. This circuit breaker is designed specifically for use on shared-neutral (multi-wire) branch circuits where the neutral connection is "shared" between two separate circuits. The Square D CAFI circuit breaker uses a state-of-the-art Arc Detection Technology to continuously monitor the circuit and quickly turn-off the power (trip) when a dangerous condition is detected. Best of all, this technology is combined with Square Ds robust and reliable short circuit/overload protection systems in a small, compact package. Engineered for Value and built for Quality, the market leading Square D brand Homeline Combination Arc Fault Circuit Interrupter combine time-tested performance with state-of-the-art technology to provide one of the safest circuit breakers available today. To help further save our customers time and money, the Square D brand CAFI circuit breakers are now equipped with a unique diagnostic feature known as Time-Saver Diagnostics. Though circuit breakers typically dont trip very often, when they do it is important to determine the source of the event quickly and accurately. This fast, easy to use Time-Saver technology helps customers locate the issue by indicating the type of fault that last occurred on the circuit.