Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1974-04-29
1976-03-09
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335147, 335195, 335201, H01H 7710
Patent
active
039434737
ABSTRACT:
A current limiting circuit breaker having for each pole, a pair of main contacts separable upon operation of a thermally and electromagnetically operable tripping device and a pair of auxiliary contacts for current limiting in series with the main contacts and in parallel with a transformable resistor having a positive temperature coefficient of resistance. The auxiliary contacts are separable when an electromagnet is energized by a fault current which simultaneously energizes a field magnet to produce a transverse magnetic field across the auxiliary contacts and the arc formed between them when separating. This simultaneous action of electromagnet and field magnet coacting for rapid contact separation and lengthening of the arc upon flow of a fault current serves to increase arc voltage almost instantaneously to that of the source, about which time the fault current is totally shunted into the resistor.
REFERENCES:
patent: 1919438 (1933-07-01), Lindstrom
patent: 2713101 (1955-07-01), Young
patent: 3068379 (1962-12-01), Cole
patent: 3136921 (1964-06-01), Dorfman et al.
patent: 3489872 (1970-01-01), Casey
patent: 3498731 (1970-03-01), Mellett et al.
patent: 3815059 (1974-06-01), Spoelman
Broome Harold
Kettelson Ernest S.
Rathbun Harold J.
Square D Company
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