QO circuit breaker for use in QO load centers. Intended for overload and short-circuit protection of electrical systems. ANSI (American National Standards Institute) certified and UL (Underwriter's Laboratories) listed. Rated for 120 volt/240 volt and 10,000 AIR. Features the exclusive Visi-Trip indicator. When the circuit breaker trips, the handle snaps to a midpoint and a highly visible red indicator easily identifies the tripped breaker.