GE Q-line, 120V, single pole, arc fault circuit breaker detects arc faults in both parallel and series wiring. Features a dedicated calibration screw which is cemented to prevent shifting and creates a stable calibration for optimum performance. Unit has a tin-plated copper stab to create a reliable, permanent, and corrosion-resistant connection. Breaker case is constructed of heat-resistant thermoset for stability and structural integrity. 1" space required.