Circuit breaker actuated by shape memory alloy

Details Circuit breaker actuated by shape memory alloy Circuit breaker actuated by shape memory alloy

1987-11-17

1989-01-10

Broome, H.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With longitudinally expansible solid element

361211, H01H 6106, H01H 7118

Patent

active

047976497

ABSTRACT:
A circuit breaker includes first and second contactors having connecting/disconnecting means which normally keeps the two contactors in contact with each other. A shape memory alloy is mechanically connected to a predetermined portion of one of the connecting/disconnecting means of one contactor is electrically connected in parallel with a device to be protected, e.g. an electric circuit or an electric element. When a voltage of a predetermined value or more is applied to the device being protected, a current of a predetermined value or more passes through the shape memory alloy, whereby the alloy is heated to produce its shape memory effect. A shape recovering force is applied to the connecting/disconnecting means of the on contactor in a predetermined direction to separate the contactors.

REFERENCES:
patent: 3858141 (1974-12-01), Lackey
patent: 4544988 (1985-10-01), Hochstein

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