Gas circuit breaker

A gas circuit breaker comprising:

• a container that contains insulation gas in a sealed manner;
• a mechanical-puffer-type arc-extinguishing chamber within the container that includes:
• a first fixed contact that is fixed to the container;
• a first movable contact that moves on a straight line in a connectable and disconnectable manner to and from the first fixed contact;
• and
• a mechanical puffer chamber that is provided in the first movable contact, shrinks in volume when shutting off a current, to compress insulation gas therein, and blows the compressed insulation gas to an arc;
• and
• a thermal-puffer-type arc-extinguishing chamber, having a mechanical configuration different from the mechanical-puffer-type arc-extinguishing chamber, within the container that includes:
• a second fixed contact that is fixed to a fixed side arc-extinguishing barrel that contacts the container;
• a second movable contact that moves on the same straight line as the first movable contact in a connectable and disconnectable manner to and from the second fixed contact;
• and
• a thermal puffer chamber that is defined by the second fixed contact and the fixed side arc-extinguishing barrel, in which insulation gas in the fixed side arc-extinguishing barrel is expanded by heating through an arc when shutting off a current, and blows the expanded insulation gas to the arc,
• wherein the mechanical-puffer-type arc-extinguishing chamber and the thermal-puffer-type arc-extinguishing chamber are arranged in series on the straight line, and
• wherein a first breaking portion including the first fixed contact and the first movable contact and a second breaking portion including the second fixed contact and the second movable contact are electrically connected in series.