QO and QOB one, two and three 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. Three spaces are required when this kit is used. Lugs will accept 12 AWG to 2/0 AWG aluminum or copper wire. The lug kit is UL component recognized and CSA certified.