Current limiting circuit breaker

Details Current limiting circuit breaker Current limiting circuit breaker

1974-04-29

1976-05-11

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

With arc-suppression or extinguishing means

200147A, H01H 930

Patent

active

039567230

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 field magnet is rectangular and tubular, with the auxiliary contacts approximately centered within the cavity defined by the tubular magnet walls. It may be formed preferably of two L-shaped magnet portions, one reversely positioned with respect to the other, to form a rectangular tube.

REFERENCES:
patent: 1763502 (1930-06-01), Branchu
patent: 1919438 (1939-07-01), Lindstrom
patent: 2337949 (1943-12-01), Walle
patent: 2411892 (1946-12-01), Peters
patent: 2713101 (1955-07-01), Young
patent: 3489872 (1970-01-01), Casey

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