Gas circuit breaker

A gas circuit breaker including a driving side electrode and a driven side electrode provided opposite to each other in a sealed tank, the driving side electrode having a driving side main contact and a driving side arc contact, the driven side electrode having a driven side main contact and a driven side arc contact, the driving side electrode being connected to an operation device, the driven side electrode being coupled to a bidirectional driving mechanism unit, the gas circuit breaker comprising:

• a sliding guide on which the driven side main contact slides being provided on an inner periphery side of the driven side main contact, wherein
• the driven side main contact is energized by a coil spring in a direction of the sliding guide,
• the driven side main contact has two contact surfaces, and
• only during normal conduction, one of the contact surfaces contacts a projected portion provided to the sliding guide and the other of the contact surfaces contacts the driving side main contact.