Vacuum switch

Details Vacuum switch Vacuum switch

1989-09-21

1991-10-22

Scott, J. R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

H01H 3366

Patent

active

050597523

ABSTRACT:
A vacuum switch comprises a highly conductive member provided on a back surface of a main electrode. The highly conductive member prevents an arc formed upon breaking a large current from becoming locally concentrated or stagnated, and promotes rapid and smooth movement of the arc from the main electrode to an auxiliary electrode. Marked enhancement and stabilization of the vacuum switch tube performance in breaking a large current, as well as enabling a smaller construction, are thereby realized. The main electrode, auxiliary electrode, and highly conductive member are formed of metal alloy materials selected so that the conductivities .sigma..sub.a, .sigma..sub.b, .sigma..sub.h of the main and auxiliary electrodes and the highly conductive member respectively satisfy the relationship .sigma..sub.a <.sigma..sub.b <.sigma..sub.h.

REFERENCES:
patent: 3462572 (1969-08-01), Sofianek
patent: 3502465 (1970-03-01), Nakajima
patent: 4210790 (1980-07-01), Kurosawa et al.

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