Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Tripping means
Patent
1991-11-06
1993-03-09
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Tripping means
335167, H01H 900
Patent
active
051929341
ABSTRACT:
A circuit breaker having a trip actuator which mechanically trips the breaker in response to an electrical trip pulse. The trip actuator includes first and second parallel magnetic circuits, with the first circuit having a lower reluctance than the second circuit. A magnet provides magnetic flux for both circuits. A pivotally mounted clapper has a first position in which it is releasably held in the first circuit by a magnetic force, and a second position. Bias springs urge the clapper towards the second position, with the bias springs providing a biasing force which is less than the magnetic force holding the clapper. The electrical trip pulse creates a magnetic flux which opposes the magnetic flux in the first circuit, switching the magnetic flux to the second circuit. The clapper member pivots to the second position, and a trip link associated with the clapper actuates a trip mechanism.
REFERENCES:
patent: 3544931 (1970-12-01), Patel
patent: 3760307 (1973-09-01), Patel
patent: 3783422 (1974-01-01), Taylor
patent: 4237439 (1980-12-01), Nemoto
Pages 26, 27, 62, 63, IB 33-790 IF, Low Voltage Power Circuit Breakers Types DS and DSL, Westinghouse Electric Corporation, Oct. 1983.
Aglietti William O.
McDonnell Brian F.
Milianowicz Stanislaw A.
Patel Nagar J.
Donovan Lincoln
Moran M. J.
Westinghouse Electric Corp.
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