Square D Company

Holly S Gerdes

William J Broghammer

The present invention provides an armature assembly for adjusting the magnetic calibration of a tripping mechanism in a circuit breaker includes a bracket having a channel defined by a pair of legs and a bight with opposing sides. A first tab and a second tab are fixedly connected to opposing sides of the bight. The first and second tabs are positioned parallel to one another and perpendicular to the opposing sides of the bight. The first and second tabs have a respective first and second hole that are threaded. A first pin rotatably connects to the tripping mechanism within the interior of the circuit breaker. The first pin is affixed across the legs of the channel. An adjustment screw has an elongated body with a top portion on one end and at the opposing end a bottom portion. The adjustment screw has a plurality of screw threads defining an exterior side wall of the elongated body along the bottom portion. The plurality of screw threads configured to releasably engage the threaded fastener component. A washer has an approximate donut shape defined by relatively flat opposing surfaces. The washer is rotatably affixed though its center to the adjustment screw. A spring has one end attached to the washer and a second end attached to the interior of the circuit breaker to provide a bias with a force adjustable as the washer is moved by rotating the adjustment screw.

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Cedar Rapids, IA, United States of America

Holly S Gerdes