Tank type vacuum circuit breaker

A tank type vacuum circuit breaker comprising:

• a pressure tank which seals and contains an electrical device, and is formed with an opening portion corresponding to a terminal portion provided on said electrical device;
• a porcelain tube which is disposed so as to protrude with respect to said pressure tank, is fixed to the opening portion at a base portion thereof, and is provided with a terminal conductor at a leading end portion thereof;
• a first connection conductor which is led out into a center portion of said porcelain tube at one end thereof, and is connected to said terminal conductor at the other end thereof;
• a second connection conductor which is opposite to one end of said first connection conductor at one side thereof, and is arranged so as to be interposed between one side thereof and the terminal portion at the other side thereof;
• a third connection conductor which is serially arranged between said first connection conductor and said second connection conductor, has a closed end concave section to be fitted onto said first connection conductor at one side thereof, and is connected to one side of said second connection conductor at the other side thereof by a fastener;
• and
• a contact disposed between said first connection conductor and the concave section of said third connection conductor;
• wherein said third connection conductor and said second connection conductor are each made of a solid conductor, and a center portion of the other side of said third connection conductor and a center portion of one side of said second connection conductor are each formed with a threaded section.