Vacuum circuit breaker

A vacuum circuit breaker comprising:

• a tank having a cylindrical shape;
• a vacuum valve accommodated in the tank and including:
• a movable-side vacuum contact point;
• a fixed-side vacuum contact point;
• a movable lead electrically connected to the movable-side vacuum contact point;
• and
• a fixed lead electrically connected to the fixed-side vacuum contact point;
• a movable-side shield formed using a conductive material in a tubular shape and installed on a movable side of the vacuum valve;
• a movable-side main contact point having a tubular shape configured to cover the vacuum valve and the movable-side shield from radially outside;
• a fixed-side main contact point disposed to face the movable-side main contact point;
• a contact point driver configured to:
• open and close a first contact point constituted by the movable-side vacuum contact point and the fixed-side vacuum contact point;
• and
• open and close a second contact point constituted by the movable-side main contact point and the fixed-side main contact point, by moving the movable-side vacuum contact point and the movable-side main contact point in conjunction with each other;
• and
• an insulating rod configured to transmit a force for opening and closing the first contact point and the second contact point in conjunction with each other to the contact point driver, wherein
• the contact point driver includes:
• a contact configured to electrically connect the movable-side shield and the movable lead, the contact being fixed to a movable-side end portion of the movable lead and disposed in a cylinder of the movable-side shield;
• a low gas pressure section lever disposed in a cylinder of the movable-side shield and connected to the contact via a contact pressure applier configured to apply a contact pressure to the contact;
• a rotary seal shaft fixed to the low gas pressure section lever, rotatably supported by the movable-side shield, penetrating the movable-side shield, and having an end portion exposed to a high gas pressure section inside the tank and outside the movable-side shield;
• and
• a high gas pressure section lever that is fixed to a portion of the rotary seal shaft exposed to the high gas pressure section, and is rotatably connected to the movable-side main contact point, wherein
• the movable-side shield and the rotary seal shaft are sealed with an airtight material.