Patent attributes
The gas-blast circuit breaker includes an electrically conductive vessel charged with insulating gases and kept at earth potential, a stationary arc-extinguishing chamber accommodated in a ground metal tank and corresponding to a moving part to extinguish an arc generated between it and the moving part, an insulating member that supports the stationary arc-extinguishing chamber to insulate the same from an earth potential portion, an opening provided on the ground metal tank, and a lid body that closes the opening provided on the ground metal tank and is arranged detachably on the opening from outside the ground metal tank, and one end of the insulating member is mounted to a mount provided on the lid body, and therefore a gas-blast circuit breaker is obtained to enable ensuring a sufficient insulation distance and appropriately and easily performing working of and a mount work of mount portions of an insulating member.
