Fault current interrupter including a metal oxide varistor

Details Fault current interrupter including a metal oxide varistor Fault current interrupter including a metal oxide varistor

1987-11-12

1989-03-28

Paschall, M. H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 11, 361 13, H02H 308, H01H 942

Patent

active

048169587

ABSTRACT:
An electric protection apparatus is provided for protection against current faults of different intensities, including, in series in an internal circuit, a first switch with automatic opening, which is controlled by moderate current levels, and a second switch with automatic opening having short circuit current limiting properties; a zinc oxide voltage limiting component, which is placed in parallel across this latter, has a fairly low stabilization threshold so that diverted currents, flowing through it at the time of opening on a short circuit, extend as far as the resistive portion of the characteristic which follows the stabilization level portion.

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patent: 4583146 (1986-04-01), Howell
patent: 4631621 (1986-12-01), Howell
patent: 4700256 (1987-10-01), Howell

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