Contact arrangement for an electrical switching device especiall

Details Contact arrangement for an electrical switching device especiall Contact arrangement for an electrical switching device especiall

1990-09-11

1992-03-17

Scott, J. R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200147R, H01H 930, H01H 3304

Patent

active

050971042

ABSTRACT:
A contact arrangement provided for an electrical switching device, particularly for a contactor or protective relay, includes a stationary contact element and a movable contact element. The stationary contact element essentially consists of an elongated current lead-in member, at the end region of which there is affixed a contact member. At this contact member there is adjacently arranged an arc guiding element which is supported at the elongated current lead-in member, but is electrically conductively connected to the current lead-in member solely at an end portion thereof. At the surface or side facing away from the elongated current lead-in member, the arc guiding element is provided on an end surface area confronting the contact member with a projection which is formed of ferromagnetic material and symmetrically arranged in the center of the arc guiding element. The shortest distance between the contact member and the projection is, at most, one half of the extent of the projection in the lengthwise direction of the arc guiding element. The contactor equipped with this contact arrangement can interrupt relatively high short-circuit currents and possesses a sufficiently long service life.

REFERENCES:
patent: 3564176 (1971-02-01), Fechant
patent: 4237355 (1980-12-01), Fechant et al.
patent: 4472613 (1984-09-01), Koller et al.
patent: 4618748 (1986-10-01), Mueller

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