Gas circuit breaker

A gas circuit breaker comprising:

• a fixed-side energizing member;
• a movable-side energizing member that is arranged to be opposed to the fixed-side energizing member in an opening-and-closing axis direction;
• a first fixed contact that is connected to the fixed-side energizing member;
• a second fixed contact that is connected to the movable-side energizing member, and is arranged to be opposed to the first fixed contact in the opening-and-closing axis direction;
• a movable contact that is capable of switching between a power-on position and a current breaking position by being driven back and forth in the opening-and-closing axis direction, bridges between the first fixed contact and the second fixed contact at the power-on position, and is brought into non-contact with the first and second fixed contacts at the current breaking position to form an arc chamber between the first and second fixed contacts;
• and
• a cylindrical outer peripheral wall that is connected to the fixed-side energizing member and the movable-side energizing member, and that surrounds a heating chamber that communicates with the arc chamber through an opening that separates the first and second fixed contacts from each other in a circumferential direction, wherein
• the outer peripheral wall includes a heat-resistive cylindrical first wall portion that is formed of a conductive material and arranged at a position opposed to the opening in a radial direction, and a cylindrical second wall portion that is connected to the first wall portion and also connected to at least one of the fixed-side energizing member and the movable-side energizing member, and is made of an insulating material.