Abstract: An energy accumulator (15) for or in an on-load tap changer (10) comprises a motor (11) with an output shaft (12) and a load diverter switch (13) with an input shaft (14), comprising an elastic storage element (17); a transmission coupled to the storage element (17) and having an input hub (201) that can be rotationally fixed to the output shaft (12); an output hub (231) that can be rotationally fixed to the input shaft (14); and a variable transmission (20, 21) interposed between the input hub (201) and the storage element (17).

Abstract: The invention relates to an indexing gear train (10) for an on-load tap changer or tap selector of a step transformer, wherein at least one cam disk (18; 20) driven by a crank mechanism (12) interacts with an out-put disk (22) having engagement elements (24) arranged on the output disk, the output disk being connected to a switch shaft (40) in a rotationally fixed manner, wherein the at least one cam disk (18; 20), in interaction with the engagement elements (24) of the output disk (22), triggers an incremental rotation of the switch shaft (40) by a defined increment angle. The engagement elements (24) are formed by rollers (26) rotatably supported on a flat side near the outer circumference of the disk (22). Said rollers roll with a corresponding engagement contour on the outer surface of the cam disk (18; 20), said engagement contour having convex and concave cam sections (30; 42) that regularly follow each other and transition into each other.

Abstract: The invention relates to a mechanical switch contact (10) for releasing, disconnecting, or switching over, in particular for an on-load tap changer of a step transformer, comprising at least two contact fingers or contact finger blocks (12, 14), which can each be pivoted between two end positions and which are connected to each other in an electrically conductive manner and which are each operatively connected to a rotatable switching shaft (18) by means of multi-arm joints (16), said switching shaft having all-around guide slots (24) for actuating the multi-arm joints (16) and for thereby deflecting the contact fingers or contact finger blocks (12, 14).