Switch and arc extinguishing material for use therein

Details Switch and arc extinguishing material for use therein Switch and arc extinguishing material for use therein

1997-09-30

1999-11-23

Friedhofer, Michael A.

High-voltage switches with arc preventing or extinguishing devic

Arc preventing or extinguishing devices

Housing structure

218 34, H01H 3308

Patent

active

059904402

ABSTRACT:
A switch containing a switch case, contacts adapted to be opened and closed, an arc extinguishing chamber disposed in the vicinity of the contacts, and an arc extinguishing material capable of reducing the amount of metal particles and free carbons to be scattered from components disposed within the switch by an arc generated when the contacts are opened or closed or capable of insulating the metal particles and the free carbons to convert into an insulator, thereby inhibiting a decrease in arc resistance expected to occur upon the generation and extinction of the arc and a decrease in insulation resistance expected to occur within and around the arc extinguishing chamber and at inner wall surfaces of the switch case upon and after the extinction of the arc. The switch is applicable to a switch expected to generate an arc upon interruption of electric current flowing therethrough such as a circuit breaker, current-limiting device or electromagnetic contactor and is capable of immediately extinguishing the arc and inhibiting the decrease in insulation resistance within and around the arc extinguishing chamber and at inner wall surfaces of the switch case.

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