Importance

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Abstract

A high tension arc-blast circuit breaker comprising at least one circuit breaker for breaking one phase of a polyphase current and disposed inside an insulating or metal envelope (70), said circuit-breaking device comprising a fixed first assembly having fixed main contacts (21) and fixed anti-sparking contacts (24, 22B ), and a moving second assembly having moving main contacts (31) and moving anti-sparking contacts (34B), the fixed assembly including a first volume (27) in which pressure is increased under the effect of the breaking arc, the gas in said volume expanding via a first nozzle (26A) to blast the arc at a zero crossing in the current to be broken, the second moving assembly including a second volume (37) in which the gas is compressed by a piston at the beginning of the circuit breaker opening phase and is directed onto the arc via a second nozzle (42A) during the later phases, characterized in that the nozzle (26A, 42A) are disposed in such a manner as to prevent any direct passage of blast gases into the volume ( 71) lying between said assemblies and said envelope.

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First Claim