Molded case circuit breaker variable arc exhaust shield

Details Molded case circuit breaker variable arc exhaust shield Molded case circuit breaker variable arc exhaust shield

1989-09-05

1990-07-31

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

With arc-suppression or extinguishing means

335 16, 335147, H01H 930

Patent

active

049453270

ABSTRACT:
An industrial-rated molded case circuit breaker employs a pair of movable contact arms to interrupt circuit current through each phase of a multi-phase electrical power distribution circuit. A contact arm guide outboard the movable contact upon overcurrent conditions. A pair of protrusions formed on the abutting surfaces of the contact arms prevents the arms from distortion under the electrodynamic attraction generated during intense overcurrent conditions. A flexible arc gas exhaust-seal is arranged between the movable contacts and the line strap connectors to seal the circuit breaker enclosure while controllably exhausting the arc gases that occur upon such intense overcurrent conditions.

REFERENCES:
patent: 3106627 (1963-10-01), Lisnay
patent: 3198924 (1965-09-01), Brumfield et al.
patent: 4589052 (1986-05-01), Dougherty
patent: 4649455 (1987-03-01), Scott
patent: 4754247 (1988-06-01), Raymont et al.
patent: 4845460 (1989-07-01), Manthe et al.
patent: 4877929 (1989-10-01), Rival

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