Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Contact-actuating means
Patent
1976-09-07
1978-01-31
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Contact-actuating means
200147R, 335 16, H01H 7710
Patent
active
040718360
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. The auxiliary contacts are carried on a pair of minimum inertia movable contact blades to facilitate rapid separation of the auxiliary contacts. The minimum inertia contact blades are elongated between a pivot point and the point at which the contacts are mounted, where they terminate without providing an arc runner portion.
REFERENCES:
patent: 2810802 (1957-10-01), Steiner
patent: 3016438 (1962-01-01), Heilman
patent: 3106627 (1963-10-01), Lisnay
patent: 3943473 (1976-03-01), Khalid
Cook James W.
Khalid Joseph M.
Oster Clark L.
Broome Harold
Guttman Richard T.
Kettelson Ernest S.
Lesser Norton
Square D Company
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