Low loss circuit breaker and actuator mechanism therefor

Details Low loss circuit breaker and actuator mechanism therefor Low loss circuit breaker and actuator mechanism therefor

1986-12-23

1987-12-15

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With longitudinally expansible solid element

337 76, H01H 7116

Patent

active

047136430

ABSTRACT:
There is disclosed a low loss circuit breaker including a housing, two exterior contacts, a pivotable arm, a means for biasing, a bifurcated member and a shape memory alloy element. The pivotable arm has a latching portion and a contact portion with the contact portion in electrical contact with one of the exterior contacts. The means for biasing exerts a biasing force with respect to the pivotable arm. The bifurcated member has a contact arm in touching relationship with the contact portion of the pivotable arm and is in electrical contact with the one of the exterior contacts through the contact portion of the pivotable arm. The bifurcated member further has a flexure arm cooperating with the latching portion of the pivotable arm wherein the flexure arm releasably restrains the pivotable arm against the biasing force exerted by the biasing means. The shape memory alloy element is operatively connected between the other of the exterior contacts and the flexure arm wherein when the shape memory alloy element is heated, the shape memory alloy element cooperates with the flexure arm to remove the restraining of the pivotable arm. Thereafter the pivotable arm is released so as to pivot and break the electrical contact between the contact portion of the pivotable arm, the contact arm and the one of the exterior contacts.

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"Control Design with VEASE.TM.", Raychem Corporation (copyright 1982).

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