Electric switching unit comprising a gas-tight casing for protec

Details Electric switching unit comprising a gas-tight casing for protec Electric switching unit comprising a gas-tight casing for protec

1985-03-22

1987-01-20

Goldberg, E. A.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Vacuum or hermetically sealed type

335154, 335156, 200146AA, H01H 166, H01H 5100

Patent

active

046382755

ABSTRACT:
An electric switching unit for preventing oxidation of copper-base contacts in contactors comprises a body (2), comprises an electromagnet (11) having a stationary yoke (7) and a moving armature (15) in cooperating relation with a plurality of switches (36). A protective casing (42) is fixed on the body so as to contain the switches. The contact-studs (30, 31, 32, 33) of the switches (36) essentially have a base of cuprous materials while a non-oxidizing atmosphere is confined and maintained beneath the protective casing (42) by seals (55, 23, 47). The seals are placed on the one hand between the moving armature (15) and a first face (21) of the body (2) and on the other hand between the casing (42) and a second face (41) of the body which is opposite to the first face.

REFERENCES:
patent: 2444198 (1948-06-01), Hasselhorn
patent: 2794087 (1957-05-01), Jennings et al.
patent: 2886669 (1959-05-01), Kelto
patent: 2908780 (1959-10-01), Walters
patent: 2908784 (1959-10-01), Kuhn et al.
patent: 3154655 (1964-10-01), Hawkins

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