| 摘要 |
Disclosed is a gas circuit breaker comprising a grounded tank which is filled with insulation gas, a stationary contact disposed in the grounded ta nk for contacting and departing from a movable contact, an arc-quenching cylinder which is connected to the stationary contact to pass the insulation gas which is blow n to an arc generated between the stationary contact and the movable contact, and an insulation frame which is arranged beneath the arc-quenching cylinder and fixed to an inner wall of the grounded tank in a manner to support the arc-quenching cylinder, wherein the arc- quenching cylinder has a substantially semicircular section portion wherein a flat wall part forming a dent part thereunder is arranged at a bottom of the arc- quenching cylinder, the insulation frame is disposed beneath the dent part of the substantially semicircular section portion, the arc-quenching cylinder has a cylinder portion for connecting to the stationary contact, and a mounting portion for connecting to the insulation frame, and the mounting portion is provided between the dent part and the cylinder portion.
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