| 摘要 |
A gas circuit breaker comprising: a pair of contactors having separable contact portions, a nozzle arranged to surround the contact portions of the contactors so as to guide a flow of a gas; a puffer chamber for compressing the gas in response to a circuit breaking action and for supplying the compressed gas into the nozzle; and an exhaust passage in one of the contactors which is adjacent to the nozzle, the gas supplied from the puffer chamber being discharged through the exhaust passage. The exhaust passage includes a first passage formed in the one of the contactors so as to extend in the axial direction thereof and second passages communicating with and branching from the first passage and extending radially with respect to the axis of the one of the contactors at positions between gas discharging holes which are provided in the puffer chamber at a predetermined circumferential spacing. A projection formed of an arc-resistant member is provided on the branch connection between the first passage and the second passages.
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