Circuit interrupter with pressure limiting

摘要

A circuit breaker provided with an interrupter of the fluid blast type in which a gas in a chamber is increased in pressure by the arc energy in the chamber which holds the high pressure gas until a fluid path is made through openings provided in the course of circuit breaking operation of the breaker and blows the gas through the openings toward the arc drawn between contact members of the breaker for interrupting the arc. The interrupter comprises measures to prevent the pressure in the chamber from being excessively increased which otherwise would cause undesirable effects on arc quenching operation in the range of large arcing currents, while maintaining a proper fluid blast operation.