On-load tap changer for uninterrupted switching over between different winding taps of a tapped transformer, wherein - at least one selector contact unit (7.1, 7.2, 7.3) with a respective plurality of fixed selector contacts (10.1, 10.2, 10.3, 10.4, 10.5), which are respectively electrically connected with the individual winding taps, is arranged along a line; - the fixed selector contacts (10.1, 10.2, 10.3, 10.4, 10.5) are actuable by two longitudinally displaceable movable selector contacts (12.1, 12.2); - for the uninterrupted switching over of two vacuum interrupters (6.1, 6.2, 6.3, 6.4, 6.5, 6.6) are provided for each phase; - a motor drive for introducing a drive movement into the on-load tap changer is provided; characterised in that - the selector contact units (7.1... 7.3) and the vacuum interrupters (6.1... 6.6) are so directly actuable by means of the common motor drive that introduction of the drive movement of the motor drive into the selector contact units (7.1.... 7.3) and the vacuum interrupters (6.1... 6.6) takes place without interposition of a mechanical energy store; - two respective vacuum interrupters (6.1 and 6.2, 6.3 and 6.4, 6.5 and 6.6) per phase are directly arranged at the corresponding slide carriage (13.1... 13.3) of the respective selector contact unit (7.1... 7.3); - the motor drive drives a central threaded spindle by means of an angle transmission; - each slide carriage (13.1... 13.3) has a separate spindle nut and - the threaded spindle co-operates with the spindle nut of each slide carriage (13.1... 13.3) and the rotational movement is so converted into a synchronous longitudinal displacement of the slide carriages (13. 1... 13.3) that not only the movable selector contacts (12.1, 12.2), but also the vacuum interrupters (6.1... 6.6) are thereby actuable. - at least one selector contact unit (7.1, 7.2, 7.3) with a respective plurality of fixed selector contacts (10.1, 10.2, 10.3, 10.4, 10.5), which are respectively electrically connected with the individual winding taps, is arranged along a line; - the fixed selector contacts (10.1, 10.2, 10.3, 10.4, 10.5) are actuable by two longitudinally displaceable movable selector contacts (12.1, 12.2); - for the uninterrupted switching over of two vacuum interrupters (6.1, 6.2, 6.3, 6.4, 6.5, 6.6) are provided for each phase; - a motor drive for introducing a drive movement into the on-load tap changer is provided; - the selector contact units (7.1... 7.3) and the vacuum interrupters (6.1... 6.6) are so directly actuable by means of the common motor drive that introduction of the drive movement of the motor drive into the selector contact units (7.1.... 7.3) and the vacuum interrupters (6.1... 6.6) takes place without interposition of a mechanical energy store; - two respective vacuum interrupters (6.1 and 6.2, 6.3 and 6.4, 6.5 and 6.6) per phase are directly arranged at the corresponding slide carriage (13.1... 13.3) of the respective selector contact unit (7.1... 7.3); - the motor drive drives a central threaded spindle by means of an angle transmission; - each slide carriage (13.1... 13.3) has a separate spindle nut and - the threaded spindle co-operates with the spindle nut of each slide carriage (13.1... 13.3) and the rotational movement is so converted into a synchronous longitudinal displacement of the slide carriages (13. 1... 13.3) that not only the movable selector contacts (12.1, 12.2), but also the vacuum interrupters (6.1... 6.6) are thereby actuable.