The Square D by Schneider Electric QO 20 amp Single-Pole Tandem Circuit Breaker is intended for overload and short-circuit protection of your electrical system. This breaker offers 2 circuits in the space of just 1 and is compatible with QO load centers, CSED devices and NQOD panel boards. All QO circuit breakers are equipped with the exclusive Visi-Trip indicator. When a QO Visi-Trip 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.