Electric circuit breaker arc chute composition

H - Electricity – 01 – H

Patent

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306/247

H01H 33/08 (2006.01) H01H 9/34 (2006.01) H01H 33/76 (2006.01)

Patent

CA 2003749

A current limiting circuit breaker having a pair of separable contacts closely spaced for electrodynamic repulsion upon the occurrence of a short circuit over-load condition utilizes an arc chute to cool and extinguish the arc that occurs when the contacts become separated. The arc chute contains a plurality of metal arc plates supported by side plates which also assist in cooling and extinguishing the arc. The side plates are formed from a suspension of wollastonite fibers within a melamine resin matrix. The wollastonite provides good mechanical strength and temperature-resistance properties while the melamine provides a continuous source of arc-quenching gaseous molecular compounds.

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