Qo And Qob One, Two, And Three Pole Thermal Magnetic Circuit Breakers Provide Overcurrent Protection And Switching On Ac Systems. These Circuit Breakers Have An Over Center, Trip Free Toggle Mechanism With Quick Make, Quick Break Action And Positive Handle Indication. They Also Have Visitrip Trip Indication, Which Provides A Visual Indication That The Circuit Breaker Has Tripped And Interrupted The Circuit. This Qo Tandem Mini Circuit Breaker Has 2 One Pole At 20A For 120/240Vac. This Unit Provides 10Ka Breaking Capacity And Is Plug In Mounting. A Full Line Of Features And Factory Installed Accessories Are Also Available Such As Shunt Trips, Auxiliary Switches And Alarm Switches. Qo Circuit Breakers Are Ul Listed Under Ul File E84967 And Are Csa Certified Under Csa Master Contract 153555.