Circuit for distortion cancellation (300, 300a) in a DC circuit (100, 100'), which has two conductors (103', 103c, 104', 104c), wherein the circuit for distortion cancellation (300, 300a) comprises: - a first component connection (VCc) for connecting the circuit for distortion cancellation (300, 300a) to a first conductor (103', 103c) of the DC circuit (100, 100'); - a second component connection (Mc) for connecting the circuit for distortion cancellation (300, 300a) to a second conductor (104', 104c) of the DC circuit (100, 100'); - a sensor (300', 300a'), wherein the sensor: - is transformer-coupled to a DC circuit (100, 100'); - is equipped to detect an exceeding of a predetermined limit of a superimposed AC current in the first conductor (103', 103c) of the DC circuit; and - is equipped to reduce the AC current in the first conductor of the DC circuit to the predetermined limit by applying a current into the first component connection (VCc); wherein the sensor (300', 300a') has a coil (302, L3; L3') for transformer-coupling to the first conductor of the DC circuit in order to form a transformer with the DC circuit (100, 100') having a predetermined coupling factor (k); wherein a first connection of the coil (L3; L3') is connected to the first component connection (VCc), characterized in that a second connection of the coil (L3; L3') is connected to the first component connection (VCc) via at least one capacitor (303, C3; C3', C4) and via at least one diode (D 1, 304, D 2, 305; D1', D2', D3, D4); wherein a connection of the at least one capacitor (C3; C3', C4) is connected to the second component connection (Mc) via a further diode (D2; D4); wherein the anode of the at least one diode (D 1, 304, D 2, 305; D1', D2', D3, D4) is connected to the cathode of the further diode (D2; D4). wherein the circuit for distortion cancellation (300, 300a) comprises: - a first component connection (VCc) for connecting the circuit for distortion cancellation (300, 300a) to a first conductor (103', 103c) of the DC circuit (100, 100'); - a second component connection (Mc) for connecting the circuit for distortion cancellation (300, 300a) to a second conductor (104', 104c) of the DC circuit (100, 100'); - a sensor (300', 300a'), wherein the sensor: - is transformer-coupled to a DC circuit (100, 100'); - is equipped to detect an exceeding of a predetermined limit of a superimposed AC current in the first conductor (103', 103c) of the DC circuit; and - is equipped to reduce the AC current in the first conductor of the DC circuit to the predetermined limit by applying a current into the first component connection (VCc); - a first component connection (VCc) for connecting the circuit for distortion cancellation (300, 300a) to a first conductor (103', 103c) of the DC circuit (100, 100'); - a second component connection (Mc) for connecting the circuit for distortion cancellation (300, 300a) to a second conductor (104', 104c) of the DC circuit (100, 100'); - a sensor (300', 300a'), wherein the sensor: - is transformer-coupled to a DC circuit (100, 100'); - is equipped to detect an exceeding of a predetermined limit of a superimposed AC current in the first conductor (103', 103c) of the DC circuit; and - is equipped to reduce the AC current in the first conductor of the DC circuit to the predetermined limit by applying a current into the first component connection (VCc); - is transformer-coupled to a DC circuit (100, 100'); - is equipped to detect an exceeding of a predetermined limit of a superimposed AC current in the first conductor (103', 103c) of the DC circuit; and - is equipped to reduce the AC current in the first conductor of the DC circuit to the predetermined limit by applying a current into the first component connection (VCc); wherein the sensor (300', 300a') has a coil (302, L3; L3') for transformer-coupling to the first conductor of the DC circuit in order to form a transformer with the DC circuit (100, 100') having a predetermined coupling factor (k); wherein a first connection of the coil (L3; L3') is connected to the first component connection (VCc), characterized in that a second connection of the coil (L3; L3') is connected to the first component connection (VCc) via at least one capacitor (303, C3; C3', C4) and via at least one diode (D 1, 304, D 2, 305; D1', D2', D3, D4); wherein a connection of the at least one capacitor (C3; C3', C4) is connected to the second component connection (Mc) via a further diode (D2; D4); wherein the anode of the at least one diode (D 1, 304, D 2, 305; D1', D2', D3, D4) is connected to the cathode of the further diode (D2; D4).