False-trip-resistant circuit breaker

Details False-trip-resistant circuit breaker False-trip-resistant circuit breaker

1995-12-21

1997-11-04

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Plural magnets or flux sources

335183, H01H 900

Patent

active

056844433

ABSTRACT:
A circuit breaker includes a coil arrangement for actuating an armature to open the breaker. To prevent false tripping during high transient currents drawn by a load, the coil arrangement has first and second coils, electrically connected in series. The second coil is interposed between the first coil and the armature and is wound in an opposite direction from the first coil to produce an opposing field.

REFERENCES:
patent: 2439165 (1948-04-01), Graves, Jr.
patent: 2817730 (1957-12-01), Wilckens
patent: 3805113 (1974-04-01), Freidrich
patent: 4439803 (1984-03-01), Baba
patent: 4502086 (1985-02-01), Ebisaka
patent: 4876521 (1989-10-01), Boyd
patent: 5053736 (1991-10-01), Fasano
Derwent's Abstract, No. 90-5978/01, Week 9001, Abstract of SU, 1488889 (Stavropol Poly), 23 Jun. 1989.

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