Contact arrangement for vacuum switches

Details Contact arrangement for vacuum switches Contact arrangement for vacuum switches

1985-08-22

1988-02-23

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

H01H 3366

Patent

active

047272287

ABSTRACT:
A contact arrangement for a vacuum switch or vacuum circuit breaker having coaxial switch contacts with a high breaking capacity in combination with a low current chopping and with an axial magnetic field with locally different field strength being generated in the region of the switch contacts characterized by each contact member of the contact arrangement having at least one contact surface and one arc-focusing surface with that the contact surface being in a region of low field strength of the axial magnetic field and the arc-focusing surface being in a region of high field strength of the magnetic field. The contact surface is formed in an element of a low-surge material while the arc-focusing surface is formed in an element having a high breaking capacity. Due to the structural design of the contact surfaces, the breaking arc is always ignited in the region of the contact surfaces and the contact arrangement is suitable for vacuum switches with high short-circuit breaking current values.

REFERENCES:
patent: 4196327 (1980-04-01), Kurosawa et al.

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