Gas Circuit Breaker

The invention provides a gas circuit breaker in a bidirectional driving mode for reducing work load of a main contact at a driven side. The gas circuit breaker includes a driving side electrode having a driving side main contact and a driven side arc contact, and a driven side electrode having a driven side main contact and a driven side arc contact in a sealed tank. The driving side electrode is connected to an operation device. The driven side electrode is coupled to a bidirectional driving mechanism unit. A sliding guide, on which the driven side main contact slides, is provided on an inner periphery side of the driven side main contact. The driven side main contact is energized by a coil spring in a direction of the sliding guide and has two contact surfaces. Only during normal conduction, one of the contact surfaces contacts a projected portion of the sliding guide and the other of the contact surfaces contacts the driving side main contact. 本发明提供种降低被驱动侧主触头的工作负荷的双向驱动方式气体断路器。该气体断路器的特征在于，密封箱(100)内具有驱动侧电极和被