Vacuum switch tube

Details Vacuum switch tube Vacuum switch tube

1992-06-15

1993-10-19

Scott, J. R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

H01H 3366, H01H 102

Patent

active

052548171

ABSTRACT:
A vacuum switch tube comprises a stationary electrode and a movable electrode, each of which includes a main electrode and an auxiliary electrode. The main and auxiliary electrodes of each of the stationary and movable electrodes are formed of an alloy of a conductive metal and fire-resisting metal, with the ratio by volume of the conductive metal to the fire-resisting metal in the main electrode being lower than the ratio by volume of the conductive metal to the fire-resisting metal in the auxiliary electrode. These ratios cause the main electrodes to have a low welding power, with the result that, at the time of breaking a large current, an arc is rapidly moved. A small-size vacuum switch tube is thus provided in which the main electrodes require a small tripping force against welding therebetween and which is capable of breaking a large current and withstanding a high voltage.

REFERENCES:
patent: 4190753 (1980-02-01), Gainer
patent: 4419551 (1983-12-01), Kato
patent: 4695687 (1987-09-01), Grosse et al.
patent: 4749830 (1988-06-01), Kippenberg et al.
patent: 4806714 (1989-02-01), Aoki
patent: 5059752 (1991-10-01), Inagaki
patent: 5109145 (1992-04-01), Fujita et al.
Patent Abstracts of Japan, vol. 14, No. 383 (E-0966), Aug. 17, 1990.
Patent Abstracts of Japan, vol. 14, No. 229 (E-928) (4172), May 15, 1990.

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