The present invention relates to an actuation system of a vacuum bottle for an electrical connection device. The vacuum bottle (1) includes a movable electrode (2) and a fixed electrode (3), the movable electrode (2) is movable longitudinally between a closed position in which the two electrodes are in contact with each other and an open position in which the two electrodes are separated. The actuation system includes an adjusting nut (10, 110) linked to the movable electrode (2) and capable of rotating for adjusting its position in relation to the movable electrode (2), a driving device (20,120) acting on the adjusting nut (10, 110) for driving the movable electrode (2) towards the open position, and a locking device (12, 112) for locking the position of the adjusting nut in relation tothe movable electrode.