Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1996-12-19
1999-04-13
Picard, Leo P.
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
337 3, 337333, 337380, H01H 3752
Patent
active
058942602
ABSTRACT:
An actuator (144) for initiating a trip of a circuit breaker. Load current passes through a conductor (66) that is electrically coupled to a contact arm (56) by a braid (62). A thermally responsive bi-metal (64) has a first end portion which is disposed against a portion of the conductor (66) and through which at least a portion of load current carried by the contact arm, the braid, and the conductor passes. The bi-metal further has a second end portion that is disposed in spaced relation to the conductor and is cantilever-mounted on the portion of the conductor via the bi-metal's first end portion. The bi-metal is nominally flat and straight, but increasingly warps as thermal energy in the bi-metal increases. Upon attaining a certain degree of warping, the bi-metal initiates a trip of the circuit breaker by causing the contact arm to swing from a circuit-making to a circuit-breaking condition.
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Cella Stephen D.
Kralik Andrew J.
Gandhi Jayprakash N.
Picard Leo P.
Siemens Energy & Automation Inc.
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