The Square D by Schneider Electric QO 45 Amp TwoPole Circuit Breaker is intended for overload and shortcircuit protection of your electrical system. The ANSIcertified and ULlisted unit is rated for 120/240 VAC and 10,000 AIR. All QO circuit breakers are equipped with the exclusive VisiTrip indicator. When a QO VisiTrip circuit breaker trips, the handle snaps to a midpoint position between "OFF" and "ON" and a highly visible, red indicator easily identifies the tripped breaker. This enables you to easily distinguish which breaker has tripped in a load center that may contain up to 42 different circuit breakers. QO circuit breakers have features no other manufacturer can offer. They come in many different sizes and can meet the needs of virtually every function in your home or business. These types of quality, industry exclusive products keep the Square D brand ahead of the competition and are builders" and electrical contractors" first choice in electrical protection.