A power electronics device having at least two inverters (14, 15, 16) and a transformer apparatus (22, 38), wherein - the inverters (14, 15, 16) are electrically connected on their AC side to a primary side of the transformer apparatus (22, 38), and the transformer apparatus (22, 38) is configured to be electrically connected on a secondary side thereof to a power distribution grid, - the transformer apparatus (22, 38) comprises a core arrangement and at least one primary winding (42, 43, 44, 60, 61, 62) and at least one secondary winding (21a, 21b, 21c, 45) that wind around the core arrangement at least in sections, - the core arrangement comprises at least two rows (66, 67, 68) of core limbs (49, 50, 51) arranged adjacent to one another, wherein the core limbs are connected to one another via yoke connections (52, 53, 54, 55) in each row (66, 67, 68), wherein - at least one electrical connection (18a - 18c, 19a - 19c, 20a - 20c) is present between a phase output (14a - 14c, 15a - 15c, 16a - 16c) of an inverter and a primary winding start (60a, 61a, 62a) of the at least one primary winding (60, 61, 62) of the transformer apparatus (22, 38), wherein the following applies to such an electrical connection: the primary winding start of the primary winding is electrically connected to exactly one phase output of one of the inverters and the primary winding is wound around a core section, adjoining a first core window, of a row, and at least one second primary winding (63, 65), electrically connected to at least one of the inverters, of the same phase is wound around a core section (84, 85) adjoining a second core window (81, 82) of another row (67, 68), which core section is spaced from the first core window, wherein a secondary winding of the same phase is wound in sections around a core section adjoining the first core window and around a core section (84, 85) adjoining the second core window (81, 82), wherein the transformer apparatus (22, 38) comprises at least two phase terminals (22a, 22b, 22c) on its secondary side, which phase terminals are each designed for the connection of a line (27a, 27b, 27c) of a power distribution grid, characterized in that the phase terminals (22a, 22b, 22c) of the transformer apparatus (22, 38) are electrically connected to one another by way of a star connection of capacitors or a polygon connection of capacitors. - the inverters (14, 15, 16) are electrically connected on their AC side to a primary side of the transformer apparatus (22, 38), and the transformer apparatus (22, 38) is configured to be electrically connected on a secondary side thereof to a power distribution grid, - the transformer apparatus (22, 38) comprises a core arrangement and at least one primary winding (42, 43, 44, 60, 61, 62) and at least one secondary winding (21a, 21b, 21c, 45) that wind around the core arrangement at least in sections, - the core arrangement comprises at least two rows (66, 67, 68) of core limbs (49, 50, 51) arranged adjacent to one another, wherein the core limbs are connected to one another via yoke connections (52, 53, 54, 55) in each row (66, 67, 68), wherein - at least one electrical connection (18a - 18c, 19a - 19c, 20a - 20c) is present between a phase output (14a - 14c, 15a - 15c, 16a - 16c) of an inverter and a primary winding start (60a, 61a, 62a) of the at least one primary winding (60, 61, 62) of the transformer apparatus (22, 38), wherein the following applies to such an electrical connection: the primary winding start of the primary winding is electrically connected to exactly one phase output of one of the inverters and the primary winding is wound around a core section, adjoining a first core window, of a row, and at least one second primary winding (63, 65), electrically connected to at least one of the inverters, of the same phase is wound around a core section (84, 85) adjoining a second core window (81, 82) of another row (67, 68), which core section is spaced from the first core window, wherein a secondary winding of the same phase is wound in sections around a core section adjoining the first core window and around a core section (84, 85) adjoining the second core window (81, 82), wherein the transformer apparatus (22, 38) comprises at least two phase terminals (22a, 22b, 22c) on its secondary side, which phase terminals are each designed for the connection of a line (27a, 27b, 27c) of a power distribution grid, characterized in that the phase terminals (22a, 22b, 22c) of the transformer apparatus (22, 38) are electrically connected to one another by way of a star connection of capacitors or a polygon connection of capacitors.