Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – With arc-suppression or extinguishing means
Patent
1979-01-29
1981-03-24
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
With arc-suppression or extinguishing means
200144R, 200147R, H01H 930, H01H 3304
Patent
active
042583454
ABSTRACT:
A molded case circuit breaker includes separable contacts, a conventional operating mechanism, and means for magnetically stretching the arc upon contact separation to provide current limiting action. In a first embodiment, the arc stretcher comprises three separate stacks of spaced parallel U-shaped magnetic plates each oriented to provide a slot parallel to the plane of the loop formed by an expanding arc. In a second embodiment, the U-shaped plates each comprise a plurality of coplanar interleaved magnetic plates electrically insulated therebetween and having extending members to form pins lining the sides of the slot formed by the stack of plates. Additional independent pins inserted into the slots of an arc chute are also provided. A third embodiment includes fixed and movable contact arms and conductive means attached thereto to provide current flow in opposite directions through the contact arms. The contact arms and conductive means are positioned and sized so as to provide positive arc positioning.
REFERENCES:
patent: 1925858 (1933-09-01), Baker
patent: 2428254 (1947-09-01), Walle
patent: 2875301 (1959-02-01), Immel
patent: 3243559 (1966-03-01), Heft
patent: 3641293 (1972-02-01), Armitage et al.
patent: 3956723 (1976-05-01), Dickens et al.
patent: 3959753 (1976-05-01), Wafer
Broome Harold
Converse, Jr. Robert E.
Westinghouse Electric Corp.
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