Thermal release for flux shift trip unit within static trip circ

Details Thermal release for flux shift trip unit within static trip circ Thermal release for flux shift trip unit within static trip circ

1984-12-05

1986-04-15

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335142, 335173, H01H 900

Patent

active

045830665

ABSTRACT:
A flux shifting circuit breaker trip device is disclosed which includes a permanent magnet for retaining a solenoid armature in opposition to a spring force. Energization of the solenoid winding produces a magnetic flux in opposition to the permanent magnet flux to extend the armature under the spring force. In order to provide ambient temperature response, the solenoid armature is formed from a stem part and a barrel part held together by a meltable material. Increase in ambient temperature above a predetermined value causes the material to melt allowing the stem part to extend under the spring force to trip the breaker.

REFERENCES:
patent: 1544138 (1925-06-01), Dreyer
patent: 2694789 (1954-11-01), Wilckens
patent: 4288770 (1981-09-01), Gillette

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