Square D QO Single-Pole Tandem Circuit Breaker QO single-pole tandem circuit breaker. Ideal for overload and short-circuit protection of electrical systems. Offers 2 circuits in the space of 1. Compatible with QO load centers, CSED devices, and NQOD panel boards. Equipped with the exclusive Visi-Trip indicator. Only to be used in load centers built prior to 1967. When breaker is tripped, the handle snaps to a midpoint position and a highly visible, red indicator easily identifies the tripped breaker. ANSI American National Standards Institute certified and UL Underwriter's Laboratories listed is rated for 120 volt/240 volt and 10,000 AIR. Amperage 20A/20A, Number of Poles 1-Pole, Interruption Type Standard Trip, Voltage 120V/240V, Frame Size 1-Space, Breaker Size 3/4 In., Mount Type Plug-In, Wire Size #12-8 AWG Al/#14-8 AWG Cu, UL Listed Yes, Pkg Qty 1