Electrical overload circuit breaker

Details Electrical overload circuit breaker Electrical overload circuit breaker

1979-07-18

1981-06-23

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335141, 337140, H01H 7512, H01H 7704

Patent

active

042753708

ABSTRACT:
An electrical overload circuit breaker utilizes as the current-responsive tripping mechanism a solenoid, the coil of which is constituted by a helical spring of shape memory effect material and which mechanically acts on the armature. There is a non-SME spring which also acts on the armature but in a direction opposing the SME spring. The current is passed through the SME spring and, when it becomes excessive, the armature is urged both mechanically and electromagnetically in a tripping direction.

REFERENCES:
patent: 2443090 (1948-06-01), Wise
patent: 2842635 (1958-07-01), Cole
patent: 3731247 (1973-05-01), Levinn

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