A snap-in adaptor plate for a circuit breaker

A snap-in adaptor plate is provided for a circuit breaker. The circuit breaker is of the type comprising a pair of shell halves which in combination define a front wall and a pair of opposed end walls. The front wall is formed with a pair of mounting recesses for accommodating a pair of corresponding internally threaded front mounting screw inserts for allowing the circuit breaker to be screw mounted against an interior face of a panel defining a relatively small conventional circular panel aperture. The adaptor plate comprises an elongate front plate having a central aperture through which a turret of the conventional circuit breaker is arranged to pass and a pair of mounting lugs extending from an inner surface of the front plate and adapted to be held captive within the mounting recesses when the front plate is fitted over the front wall. A pair of spaced apart retaining clips extend rearwardly from opposite ends of the front plate adjacent the end walls of the circuit breaker for allowing the assembled snap-in adaptor plate and circuit breaker to engage the opposed edges of an oversize panel aperture in a snap fit. The invention extends to a modified circuit breaker assembly comprising a snap-in adaptor plate of the type described and a conventional circuit breaker.