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 2 Pole Qo Circuit Breaker Is Rated At 150A At 240Vac. This Unit Provides 22Ka Breaking Capacity And Is Bolt On 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.