Circuit Breaker

摘要

A circuit breaker including two contacts, a pressurization chamber, a nozzle arrangement designed to blow an arc in a quenching region, with a narrowest passage of a pressurization chamber outflow channel to be passed by outflowing quenching gas defining a pressurization chamber outflow limiting area, a narrowest passage of a nozzle channel to be passed by outflowing quenching gas defining a nozzle outflow limiting area, the smaller area of which defining an absolute outflow limiting area, with quenching gas having a global warming potential lower than the one of SF6 over an interval of 100 years; wherein a ratio of the pressurization chamber outflow limiting area to the nozzle outflow limiting area is less than 1.1:1.

主权项

1. A circuit breaker comprising:
at least two contacts movable in relation to each other and defining a quenching region in which an arc is formed during a current breaking operation, a pressurization chamber designed such that a quenching gas contained therein is pressurized during a current breaking operation, and a nozzle arrangement designed to blow an arc in the quenching region using the quenching gas flowing out from the pressurization chamber, said nozzle arrangement comprising at least one nozzle defining a nozzle channel, which during a current breaking operation is connected to the pressurization chamber by a pressurization chamber outflow channel, the narrowest passage of the pressurization chamber outflow channel to be passed by the outflowing quenching gas defining a pressurization chamber outflow limiting area Apc, and the narrowest passage of the nozzle channel to be passed by the outflowing quenching gas defining a nozzle outflow limiting area An, the smaller area of which defining an absolute outflow limiting area A, the quenching gas having a global warming potential lower than the one of SF6 over an interval of 100 years, characterized in that the ratio of the pressurization chamber outflow limiting area Apc to the nozzle outflow limiting area An is less than 1.1:1.