On-load tap changer for uninterrupted switching over between different winding taps of a tapped transformer, consisting of a selector and a load changeover switch, wherein - the selector has fixed selector contacts, which are respectively electrically connected with the individual winding taps and which are arranged along a linear path, - the fixed selector contacts are selectably connectible by two longitudinally displaceable, movable selector contacts (9, 10) of the selector, - switching elements (16, 17), particularly vacuum interrupters, are arranged in the load changeover switch for uninterrupted switching over for each phase, - a motor drive with a drive motor is arranged for initiation of a switching over process of the on-load tap changer, characterised in that - the two movable selector contacts (9, 10) and the switching means (16, 17) are so directly actuable by means of the drive motor that the initiation of the drive movement of the drive motor at the movable selector contacts (9, 10) and the switching means (16, 17) takes place without interposition of a mechanical energy store, - a rotational movement produced by the drive motor of the motor drive is directly transmissible to a threaded spindle, - not only the movable selector contacts (9, 10), but also the switching means (16, 17) are actuable by the rotating threaded spindle, - a spindle nut is guided on the threaded spindle to be displaceable in the direction of the linear path, - the spindle nut carries a selector contact unit, on which the movable selector contacts (9, 10) are fastened firmly and fixed in their spacing from one another and are actuable in common with the selector contact unit; wherein - the on-load tap changer is arranged on a support plate, - contact and guide rails (11 and 12) of electrically conductive material are disposed on the support plate parallel to one another and not only parallel to the path of the fixed selector contacts, but also parallel to the threaded spindle longitudinally of the path, which rails on the one hand ensure mechanical guidance of the selector contact unit and on the other hand serve for electrical connection of the movable contacts (9, 10) with respect to the switching elements (16, 17). - the selector has fixed selector contacts, which are respectively electrically connected with the individual winding taps and which are arranged along a linear path, - the fixed selector contacts are selectably connectible by two longitudinally displaceable, movable selector contacts (9, 10) of the selector, - switching elements (16, 17), particularly vacuum interrupters, are arranged in the load changeover switch for uninterrupted switching over for each phase, - a motor drive with a drive motor is arranged for initiation of a switching over process of the on-load tap changer, - the two movable selector contacts (9, 10) and the switching means (16, 17) are so directly actuable by means of the drive motor that the initiation of the drive movement of the drive motor at the movable selector contacts (9, 10) and the switching means (16, 17) takes place without interposition of a mechanical energy store, - a rotational movement produced by the drive motor of the motor drive is directly transmissible to a threaded spindle, - not only the movable selector contacts (9, 10), but also the switching means (16, 17) are actuable by the rotating threaded spindle, - a spindle nut is guided on the threaded spindle to be displaceable in the direction of the linear path, - the spindle nut carries a selector contact unit, on which the movable selector contacts (9, 10) are fastened firmly and fixed in their spacing from one another and are actuable in common with the selector contact unit; - the on-load tap changer is arranged on a support plate, - contact and guide rails (11 and 12) of electrically conductive material are disposed on the support plate parallel to one another and not only parallel to the path of the fixed selector contacts, but also parallel to the threaded spindle longitudinally of the path, which rails on the one hand ensure mechanical guidance of the selector contact unit and on the other hand serve for electrical connection of the movable contacts (9, 10) with respect to the switching elements (16, 17).