QO and QOB 1, 2 and 3-pole thermal magnetic circuit breakers provide overcurrent protection and switching on ac and dc 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 miniature breaker is rated as 15 A, 120/240 V and 2-pole. This unit provides 10 kA breaking capacity and plug-in mounting. A full line of factory installed accessories is also available such auxiliary switches, alarm switches and shunt trips. This unit has a factory installed ground fault protection and aux switch 1B. QO breakers use a compact 3/4 in W design for small system footprint. QO circuit breakers are UL listed under UL File E84967 and are CSA Certified under CSA Master Contract 153555.