The Square D Type QO 20a Single Pole Combination Arc Fault Circuit Interrupter CAFI is a reliable electrical device designed for interior use. With a maximum amperage of 20A and a voltage of 120VAC, this combination arc fault circuit interrupter is suitable for any room and features a plug-in, clip-on mounting style for easy installation. The black-colored interrupter is designed with a single pole single throw (SPST) contact configuration and offers instantaneous break time for safe and efficient operation. Made of ABS/plastic material, this Square D model QO is a high-quality choice for branch circuit applications in the United States.