QO single pole combination arc-fault circuit interrupting (CAFCI) circuit breaker. Helps protect wires from arcing faults and is intended for overload and short-circuit protection of electrical systems. Time-Saver Diagnostics provides advanced trip indication technology, helping identify the type of fault that has occurred faster. Equipped with the exclusive Visi-Trip indicator which when tripped the handle snaps to a midpoint position and a highly visible, red indicator easily identifies the tripped breaker. 1 space required. 120 volt. UL (Underwriter's Laboratories) listed.