Gas circuit breaker

A gas circuit breaker comprising:

• a drive-side electrode;
• and
• a driven-side electrode which are provided so as to face each other inside a closed tank,
• wherein the drive-side electrode includes a drive-side main electrode and a drive-side arc electrode, the driven-side electrode has a driven-side main electrode and a driven-side arc electrode, the drive-side arc electrode is connected to an actuator and the driven-side arc electrode is coupled to a bidirectional driving mechanism,
• the bidirectional driving mechanism includes a drive-side linkage rod receiving a driving force from the drive-side electrode, a driven-side linkage rod connected to the driven-side arc electrode, two levers moving the driven-side linkage rod in an opposite direction with respect to the motion of the drive-side linkage rod, and a guide inside which the drive-side linkage rod and the driven-side linkage rod move,
• the two levers are arranged on both sides of the guide and fixed to each other so as to rotate freely by a lever fixing member,
• a moveable pin penetrates through a first groove cam possessed by the drive-side linkage rod, a second cam possessed by the guide and third cams possessed by the two levers respectively so as to rotate freely, and
• a connecting member for connecting between the two levers and the driven-side linkage rod at an opposite position of the moveable pin with the lever fixing member interposed therebetween in the two levers.