Abstract: Switched transistors (T1 . . . through T4 . . .) are arranged in a bridge circuit such that a plurality of transistors (T1 . . . through T4 . . .) are connected in parallel in every bridge branch. These transistors are secured on a thermally and electrically conductive ring (R, R'), are symmetrically distributed over this ring (R1, R1'), and have a respective terminal electrically connected thereto. The connection to further terminals of the transistors (T1 . . . through T4 . . .) occurs essentially in rotationally-symmetrical fashion via large-area printed circuit boards (LE1 through LE6). Short connecting paths with low values of inductance are achieved with this arrangement. Furthermore, the waste heat from all transistors (T1 . . . through T4 . . .) is uniformly carried off via the rings (R1, R1'), so that all transistors (T1 . . . through T4 . . .) work at the same temperature. A uniform current division onto all transistors (T1 . . . through T4 . . .