Circuit breaker having members coated with phosphate-chromate pr

Details Circuit breaker having members coated with phosphate-chromate pr Circuit breaker having members coated with phosphate-chromate pr

1975-05-23

1976-09-07

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335196, 148 616, 252389A, H01H 7500

Patent

active

039797040

ABSTRACT:
A circuit breaker, operating in an insulating liquid dielectric environment, switchable between an open position 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.

REFERENCES:
patent: 2768104 (1956-10-01), Schuster et al.
patent: 3706604 (1972-12-01), Plaxton
patent: 3803048 (1974-04-01), Hwa
patent: 3860898 (1975-01-01), Leonard
patent: 3864139 (1975-02-01), Heller

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