breaker control of the contact movement is through a pivoted actuator and over center linkage in conjunction with a bell crank lever operating a spring mounted contact moving through a short radius application_number US 42641589 A description the circuit breaker of the invention includes an outer housing generally indicated at 10 consisting of parallel spaced side walls 12 and spaced end walls 14 the sides and end walls define a rectangular configuration and the inner end of the housing defined by the walls is open for receiving the inner housing generally indicated at 16 the outermost side of the housing 10 is designated the access side 18 and includes an opening for receiving the manual actuator as will be later described externally the housing 10 is provided with a pair of resilient deflectable retaining fingers 20 which are formed during the molding of the housing and include serrated portions for engaging the edges of the rectangular opening in a circuit box or panel in which the circuit breaker is normally mounted not shown upon the housing 10 being inserted into the panel opening not shown the retaining fingers 20 will momentarily be deflected inwardly and then snap outwardly to engage the opening edges and maintain the housing face plate 22 flush with the panel cover this type of circuit breaker retention is well known in the art as conventionally employed the inner housing 16 is inserted into the outer housing through the inner open end 24 and the operating components for the circuit breaker are mounted thereon these components include the manual circuit breaker actuator 26 pivotally mounted upon the inner housing barrier wall.