Siemens QJ22B150AK is a two-pole molded-case circuit breaker from the QJ frame, rated for 240 VAC and 150 A, listed as a white-label AK variant. As part of the QJ2 family, it provides overcurrent protection for low-voltage circuits in panelboards and distribution equipment. The model name QJ22B150AK denotes a 2-pole, 150-amp, 240-volt device in the Siemens QJ series.
