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a+b series cb [421ms]
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Allows only 1 of a pair of double-pole AC circuit to be activated at a time. Guarantees that AC power from 2 sources (power company and genset or inverter) will not be mixed. Fits all double-pole A and B series circuit breakers. Uses circuit breaker mounting screw holes and requires no special panel modification. Includes mounting screws, #6 flat head.