Abstract: A vacuum circuit breaker including a vacuum interrupter with a fixed electrode and a movable electrode arranged to be moved into contact with or separated from the fixed electrode. The vacuum circuit breaker includes a movable rod mounted on the movable electrode, an operating mechanism unit for generating operating force to perform the opening and closing operation of the vacuum interrupter, a main shaft mounted on the operating mechanism unit and a drive lever rotatably mounted on the operating mechanism unit by the main shaft for transmitting the operating force towards the vacuum interrupter. The vacuum circuit breaker further includes a crank lever rotatably mounted at a working end of the drive lever and a pressurizing unit provided in the drive lever and the crank lever for generating resilient force to resiliently maintain closed condition of the vacuum interrupter.