GAS CIRCUIT BREAKER

To improve the capability of arc extinction in a gas circuit breaker.SOLUTION: In a gas circuit breaker, a columnar stator and a rotor which are coaxially disposed are displaced in an axial direction by operating an opening/closing drive device to bring electrodes of the stator and the rotor into both closed electrode and opened electrode states, and an arc extinction gas is blown to an arc which is generated between the electrodes of the stator and the rotor in the case of an electrode opening operation for shifting from the closed electrode to the opened electrode. Further in the electrode opening operation, at least one insulation movable body which is provided at an arc generation portion protrudes from a side part to a path of the arc. Thus, the path of the arc in the electrode opening operation can be surely extended, and a capability of arc extinction can be improved.SELECTED DRAWING: Figure 1 【課題】ガス遮断器において，アークの消弧の能力を向上させる必要がある。【解決手段】ガス遮断器において，同軸に配置された円柱状の固定子と可動子が開閉駆動装置の動作によって軸方向に変位することで前記固定子と可動子それぞれの電極が閉極と開極の両状態となり，閉極から開極に移行する開極動作の際に前記固定子と可動子の電極間に発生するアークに消弧ガスを吹き付けるものであって，前記開極動作においてさらに，アーク発生部位に設けられた少なくとも１つの絶縁可動体がアークの経路に対して側部より突出することにより，開極動作時のアークの経路を確実に伸ばすことができ，アークの消弧の能力を向上させることができる。【選択図】図１