P.c. board mounted thermal breaker

Details P.c. board mounted thermal breaker P.c. board mounted thermal breaker

H - Electricity

01

H

306/188

H01H 71/16 (2006.01) H01H 61/04 (2006.01) H01H 73/30 (2006.01)

Patent

CA 1206190

PC-BOARD MOUNTED THERMAL BREAKER ABSTRACT A PC-board mounted thermal breaker that opens with a snap action is disclosed. A bimetallic element, connected to the load terminal of the thermal breaker, rests on an insulated sawtooth surface when the breaker is in the closed position. A contact blade, connected to the line terminal of the breaker, is pivotably biased downward into electrical contact with the bimetallic element by the action of an overcenter spring. An overcurrent through the breaker heats the bimetallic element directly and causes it to bend up- wardly, forcing the contact blade to pivot against the bias of the spring. When the contact blade has pivoted suffi- ciently to move the spring overcenter, the direction of spring bias reverses, pivoting the contact blade rapidly upward, and thereby opening the breaker with a snap action

450374

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