Circuit breaker

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, a 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 global warming potential of sulphur hexafluoride over an interval of 100 years,
• wherein a ratio of the pressurization chamber outflow limiting area Apc to the nozzle outflow limiting area An is less than 1.1:1.