Inverter for a multi-phase AC network with a number of transistor half-bridges or multi-level circuits (H 1, H 2, H 3), the ends or connections of which are each connected to an intermediate circuit voltage of an intermediate circuit stabilisation circuit and the centre point or output of which is connected to the respective phase, - wherein the inverter has a control unit which controls the individual transistors of the transistor half-bridges or multi-level circuits (H 1, H 2, H 3) according to predetermined criteria, in particular based on measured currents and voltages, so that at the centre of the respective half-bridge or at the output of the respective multi-level circuit (H 1, H 2, H 3) a voltage curve is produced that is approximated to an AC voltage curve, and - wherein for each of the transistors of at least one of the half-bridges or of at least one of the multi-level circuits (H 1, H 2, H 3) an additional transistor is provided in each case, which is connected in parallel with this transistor in each case, wherein the additional transistor is designed for a nominal current load which is below the nominal current load of the transistor, in particular below 20% of the nominal current load of the transistor, and wherein - a current or power measuring device is provided for measuring the current or power transmitted by the inverter, which is connected upstream of the control unit and is configured to supply the control unit with a measured current or power value, - wherein the control unit is configured to control the additional transistors instead of the transistors connected in parallel with them, in the event that the target power to be transmitted by the inverter or the current flowing through the inverter falls below a predetermined threshold value, characterised in that - the multi-level circuits are formed as three-level circuits, - the intermediate voltage circuit has a centre connection, - the centre points (M1, M2, M3) of the three-level circuits (H1, H2, H3) are each connected to the centre connection of the intermediate voltage circuit via two IGBT transistors (T1E, T1F; T2E, T2F; T3E, T3F) which are arranged in opposing rows and whose emitters face each other in pairs, and - the control unit is configured to deactivate the IGBT transistors (T1E, T1F, T2E, T2F, T3E, T3F) and switch them to a non-conductive state in the event that the target power to be transmitted by the inverter or the current flowing through the inverter falls below a predetermined threshold value, otherwise, the IGBT transistors (T1E, T1F, T2E, T2F, T3E, T3F) are controlled in such a way that a pulse-width modulated signal is generated at the centre points (M1, M2, M3), which also accesses the centre connection of the intermediate voltage circuit. - wherein the inverter has a control unit which controls the individual transistors of the transistor half-bridges or multi-level circuits (H 1, H 2, H 3) according to predetermined criteria, in particular based on measured currents and voltages, so that at the centre of the respective half-bridge or at the output of the respective multi-level circuit (H 1, H 2, H 3) a voltage curve is produced that is approximated to an AC voltage curve, and - wherein for each of the transistors of at least one of the half-bridges or of at least one of the multi-level circuits (H 1, H 2, H 3) an additional transistor is provided in each case, which is connected in parallel with this transistor in each case, wherein the additional transistor is designed for a nominal current load which is below the nominal current load of the transistor, in particular below 20% of the nominal current load of the transistor, and wherein - a current or power measuring device is provided for measuring the current or power transmitted by the inverter, which is connected upstream of the control unit and is configured to supply the control unit with a measured current or power value, - wherein the control unit is configured to control the additional transistors instead of the transistors connected in parallel with them, in the event that the target power to be transmitted by the inverter or the current flowing through the inverter falls below a predetermined threshold value, characterised in that - the multi-level circuits are formed as three-level circuits, - the intermediate voltage circuit has a centre connection, - the centre points (M1, M2, M3) of the three-level circuits (H1, H2, H3) are each connected to the centre connection of the intermediate voltage circuit via two IGBT transistors (T1E, T1F; T2E, T2F; T3E, T3F) which are arranged in opposing rows and whose emitters face each other in pairs, and - the control unit is configured to deactivate the IGBT transistors (T1E, T1F, T2E, T2F, T3E, T3F) and switch them to a non-conductive state in the event that the target power to be transmitted by the inverter or the current flowing through the inverter falls below a predetermined threshold value,