Abstract: The reset lever on a circuit breaker undervoltage relay is actuated by translating arcuate movement of a handle arm pin as the circuit breaker handle is moved to the off position into rotation of the reset lever through a complaint interface lever that is stiff enough to actuate the reset lever, but flexible enough to accommodate for overtravel of the handle arm pin when the circuit breaker is reset and for the stackup of tolerances in the operating mechanism.

Abstract: A U-shaped accessory actuator clip that snaps onto the crossbar of a multipole circuit breaker is integrally molded of a compliant material with a flexible finger that actuates/deactuates an accessory, such as an auxiliary switch, as the contacts of the breaker close and open.

Abstract: The secondary cover of a molded case electric power switch housing is removably secured in place to enclose cavities in a primary cover for auxiliary devices by quick release fasteners. These quick release fasteners have a shaft with self taping threads which engage mounting holes in the top face of the primary cover. In an unlatched position, the non-circular heads register with complimentary non-circular apertures in the secondary cover which passes down over the heads of the quick release fasteners and seats on the top face of the primary cover. The quick release fasteners are then rotated clockwise ¼ turn by a tool to a latched position to clamp down on the secondary cover. A pair of diametrically opposite arcuate recesses in the secondary cover at each non-circular aperture assure that the quick release fasteners can only be rotated clockwise to the latched position as side walls of these recesses form stops at the ¼ turn position.