Square D™ QO™ and QOB Miniature Circuit Breakers, QO140, come in plug-in mounted version and in a complete range of amperages and interrupting ranges to fit into various QO distribution panels. UL listed CSA certified They also have VisiTrip trip indication, which provides a visual indication that the circuit breaker has tripped and interrupted the circuit. This 1 pole QO circuit breaker is rated at 40A at 120/240VAC. This unit provides 10kA breaking capacity and 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.