Square D Homeline 20-Amp 1-Pole Combination Arc Fault Circuit BreakerHomeline 20 Amp single pole plug on neutral combination AFCI circuit breaker 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