Electric switch having enhanced fault current capability

Details Electric switch having enhanced fault current capability Electric switch having enhanced fault current capability

1982-08-27

1984-08-21

Miller, J. D.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Contact-actuating means

H01H 7900

Patent

active

044673019

ABSTRACT:
In an electric switch having a bridging contact movable into and out of engagement with a pair of fixed contacts, at least one of the terminal elements supporting the fixed contacts comprises a strip of sheet metal folded back upon itself to provide a loop shaped current path with first and second conductive sections extending generally parallel to the bridging contact on opposite sides thereof in close proximity thereto. Attractive forces electrodynamically developed between the bridging contact and the first conductive section of the one terminal element are additive to repulsive forces electrodynamically developed between the bridging contact and the second conductive section of the one terminal element for increasing contact pressure between the bridging contact and the fixed contacts under excessive current conditions.

REFERENCES:
patent: 1754349 (1930-04-01), Bruhlman
patent: 1762604 (1930-06-01), Ainsworth
patent: 2944129 (1960-07-01), Cole et al.
patent: 3419828 (1968-12-01), Bremer
patent: 4278958 (1981-07-01), Kandatsu

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