Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With bimetallic elements
Patent
1983-11-10
1985-04-09
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With bimetallic elements
337 56, 337 66, 337372, H01H 6100, H01H 7116
Patent
active
045104794
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 upwardly, forcing the contact blade to pivot against the bias of the spring. When the contact blade has pivoted sufficiently 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.
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Airpax Corporation
Broome Harold
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