Circuit breaker arc chute having components of refractory inorga

Details Circuit breaker arc chute having components of refractory inorga Circuit breaker arc chute having components of refractory inorga

1975-04-16

1977-02-01

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200149A, H01H 3308

Patent

active

040063305

ABSTRACT:
This arc chute comprises an arc-confining portion of an electric insulating material comprising the heat and pressure reacted thermoset product of a mixture of chrysotile asbestos, orthophosphoric acid, and silica sand. The silica sand is present in the mixture in an amount of between 23.5 and 30.5 percent by weight of the mixture. The insulating material prior to operation of the arc chute has a surface layer formed by subjecting the pre-existing surface of the material to arc-plasma flame treatment that converts the material at said surface to an amorphous fused material, the major proportion of which is silica.

REFERENCES:
patent: 2270723 (1942-01-01), Boehne
patent: 2366485 (1944-12-01), Brink et al.
patent: 2704381 (1955-03-01), Nelson
patent: 3735074 (1973-05-01), Frind et al.
patent: 3814620 (1974-06-01), Bailey et al.

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