Vacuum circuit interrupter with disc-shaped beryllium contacts

Details Vacuum circuit interrupter with disc-shaped beryllium contacts Vacuum circuit interrupter with disc-shaped beryllium contacts

1976-03-17

1979-01-16

Schaefer, Robert K.

Electricity: circuit makers and breakers

Electric switch details

Contact

200279, 200144B, H10H 106

Patent

active

041350715

ABSTRACT:
This vacuum-type circuit interrupter is a high current interrupter rated for interrupting currents of 35,000 amperes r.m.s. or higher. Despite this high current interrupting requirement, each of its disc-shaped contacts can be made from an exceptionally small and thin blank because these contacts are of beryllium and each has a flat surface, without the usual central recess, extending from its center to a perimeter located radially between the outer periphery of the contact and the outer periphery of the inner end of the associated contact rod. On this flat surface of beryllium, contact-engagement occurs and arcs are initiated during interruption. Each contact rod is joined to its associated beryllium contact by means of brazed joint, a portion of which is accommodated in a very shallow recess on the back surface of the contact.

REFERENCES:
patent: 2310658 (1943-02-01), Atlee
patent: 3140373 (1964-07-01), Horn
patent: 3270172 (1965-04-01), Chubb
patent: 3440377 (1969-04-01), Wesoloski
patent: 3441698 (1966-10-01), Sofianek
patent: 3903386 (1975-09-01), Yanagisawa

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