Circuit breaker comprising two contacts (1, 2), a pressurization chamber (5), a nozzle arrangement (6) designed to blow an arc (8) in a quenching region (3), with a narrowest passage of a pressurization chamber outflow channel (71) to be passed by outflowing quenching gas (4) defining a pressurization chamber outflow limiting area A pc , a narrowest passage of a nozzle channel (63) to be passed by outflowing quenching gas (4) defining a nozzle outflow limiting area A n , the smaller area of which defining an absolute outflow limiting area A, with quenching gas (4) 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 A pc to the nozzle outflow limiting area A n is less than 1.1:1.