Circuit breaker having members coated with...

Details Circuit breaker having members coated with... Circuit breaker having members coated with...

H - Electricity

01

H

306/160

H01H 71/12 (2006.01) H01H 33/02 (2006.01)

Patent

CA 1058259

IMPROVED CIRCUIT BREAKER HAVING MEMBERS COATED WITH PHOSPHATE-CHROMATE PROTECTIVE LAYERS ABSTRACT OF THE DISCLOSURE A circuit breaker, operating in an insulating liquid dielectric environment, switchable between an open posi- tion and a closed position, is made of metallic sensing, tripping and supporting members, where a plurality of the members are coated with a dual protective film comprising a first layer containing zinc phosphate or iron phosphate about 0.00001 to about 0.0004 inch thick covered by an outside layer containing zinc chromate and/or zinc dichromate about 0.00001 to about 0.0004 inch thick, the protective film being resistant to the contacting liquid dielectric.

251215

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