GAS CIRCUIT BREAKER

PROBLEM TO BE SOLVED: To provide a bidirectional drive type gas circuit breaker which reduces an operation-time load of a driven side main contact.SOLUTION: Within a sealed tank (100), the gas circuit breaker comprises a driving side electrode including a driving side main contact (2) and a driving side arc contact (4) and a driven side electrode including a driven side main contact (3) and a driven side arc contact (5). The driving side electrode is connected to a manipulator (1), and the driven side electrode is coupled to a bidirectional driving mechanism part (101). A slide guide (18) along which the driven side main contact (3) is slid is provided at an inner peripheral side of the driven side main contact (3), and the driven side main contact (3) is energized in a slide guide direction by a coil spring (19). The driven side main contact (3) includes two contact surfaces (3A and 3B). Only during normal electrification, one contact surface (3B) and a projection (181) provided in the slide guide (18) are brought into contact with the other contact surface (3A) and the driving side main contact (2).SELECTED DRAWING: Figure 1 【課題】被駆動側主接触子の動作時荷重を低減する双方向駆動方式ガス遮断器を提供する。【解決手段】密封タンク（１００）内に、駆動側主接触子（２）と駆動側アーク接触子（４）を有する前記駆動側電極と、被駆動側主接触子（３）と被駆動側アーク接触子（５）を有する被駆動側電極を有し、前記駆動側電極は操作器（１）に接続され、前記被駆動側電極は双方向駆動機構部（１０１）に連結され、被駆動側主接触子（３）が摺動する摺動ガイド（１８）を被駆動側主接触子（３）の内周側に有し、被駆動側主接触子（３）はコイルばね（１９）により摺動ガイド方向に付勢され、被駆動側主接触子（３）は、二つの接触面（３Ａ、３Ｂ）を有し、通常通電時のみに、一方の接触面（３Ｂ）と摺動ガイド（１８）に設けられた凸部（１８１）、及び、他方の接触面（３Ａ）と駆動側主接触子（２）が接触することを特徴とする。【選択図】図１