Thermal override for static trip circuit breakers

Details Thermal override for static trip circuit breakers Thermal override for static trip circuit breakers

1979-11-28

1981-09-08

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

337 54, 335145, H01H 900

Patent

active

042887704

ABSTRACT:
A flux shifting type trip device, which is electrically activated under the control of a static trip unit to mechanically initiate tripping of a circuit breaker automatically in response to an abnormal current condition in a protected circuit, is equipped with a thermal responsive element operative to directly, mechanically activate the trip device and thereby initiate circuit breaker tripping automatically in response to an excessive ambient temperature condition within the circuit breaker enclosure.

REFERENCES:
patent: 2335888 (1943-12-01), Stilwell, Jr.
patent: 2358357 (1944-09-01), Stilwell, Jr.
patent: 2482955 (1949-09-01), Wilson
patent: 3103563 (1963-09-01), Grenier
patent: 3728658 (1973-04-01), Kasahara

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