Gas Circuit Breaker

A gas circuit breaker in which a drive-side electrode and a driven-side electrode are provided so as to face each other inside a sealed tank, the drive-side electrode has a drive-side main electrode and a drive-side arcing contact, and the driven-side electrode includes a driven-side main electrode and a driven-side arcing contact, the drive-side arcing contact is connected to an actuator, and the driven-side arcing contact is connected to a double motion mechanism section,

• wherein the double motion mechanism section includes a drive-side connecting rod receiving a driving force from the drive-side electrode, a driven-side connecting rod connecting to the driven-side arcing contact, two levers operating the driven-side connecting rod in an opposite direction with respect to an operation of the drive-side connecting rod, and a guide in which the drive-side connecting rod and the driven-side connecting rod move thereinside,
• the two levers are arranged on both sides of the guide, which are fixed to each other so as to rotate freely by a lever fixing pin,
• a movable pin is connected to a first grooved cam formed in the drive-side connecting rod, a second grooved cam formed in the guide and third grooved cams formed in the two levers respectively, and
• posture holding members which hold the movable pin so that an axis of the movable pin is approximately orthogonal to an opening/closing operation shaft of a circuit breaker part are provided.