VACUUM INTERRUPTER

A vacuum circuit breaker (50) includes: a grounded tank (1); a vacuum valve (2) including a vacuum container (2c) housing a movable contact (2a) and a stationary contact (2b), a movable conductor (7) that is connected to the movable contact (2a) and extends out of the vacuum container (2c), and a tubular bellows (3); a tubular movable-side bushing conductor (12a); a slider (40) movably set inside the movable-side bushing conductor (12a); a movable-side frame (5) that communicates with a space inside a tube of the bellows (3) and electrically connects the movable-side bushing conductor (12a) to the movable conductor (7); an operation rod (31) having one end (31a) protruding to an outside of the grounded tank (1) and an opposite end (31b) connected to the movable conductor (7); an operating device (30) that moves the operation rod (31); a movable-side support plate (8a) covering an end of the grounded tank (1) where the operation rod (31) extends out of the grounded tank (1); and a packing (33) set in a hole (32) .