Current sensor for detecting the current intensity (Ip) of a current flowing through a conductor, comprising: an induction winding assigned to the conductor, said induction winding providing an induction signal proportional to the time derivative of the current intensity (Ip), a Hall sensor assigned to the conductor, said Hall sensor providing a Hall signal proportional to the current intensity (Ip), a calibration winding assigned to the Hall sensor, a sinusoidal calibration current of defined frequency (ω cal) being able to be applied continuously to said calibration winding by a generator, said calibration current bringing about a defined magnetic field in the Hall sensor, a first evaluation circuit, to the input of which the induction signal is able to be applied, a second evaluation circuit having a low-pass filter, to the input of which second evaluation circuit the Hall signal is able to be applied, wherein the frequency (ω cal) of the calibration current lies below the transition frequency of the low-pass filter of the second evaluation circuit, a third evaluation circuit, which is connected to the output of the second evaluation circuit and which is composed of a discrete Fourier transformation circuit and an evaluator and which evaluates a part of the Hall signal that is assignable to the calibration current and uses said part to define a parameter of the second evaluation circuit and furthermore provides a signal regarding the amplitude and the phase (φ) of the signal components of the output voltage of the second evaluation circuit that are assignable to the calibration current of defined frequency (ω cal), wherein the signal components are extracted by the discrete Fourier transformation circuit, and a fourth evaluation circuit for generating an output signal representing the current intensity (Ip), said output signal constituting the sum of the output signal of the first evaluation circuit and the output signal of the second evaluation circuit minus the part of the output signal of the second evaluation circuit that is assignable to the calibration current and is provided by the third evaluation circuit. an induction winding assigned to the conductor, said induction winding providing an induction signal proportional to the time derivative of the current intensity (Ip), a Hall sensor assigned to the conductor, said Hall sensor providing a Hall signal proportional to the current intensity (Ip), a calibration winding assigned to the Hall sensor, a sinusoidal calibration current of defined frequency (ω cal) being able to be applied continuously to said calibration winding by a generator, said calibration current bringing about a defined magnetic field in the Hall sensor, a first evaluation circuit, to the input of which the induction signal is able to be applied, a second evaluation circuit having a low-pass filter, to the input of which second evaluation circuit the Hall signal is able to be applied, wherein the frequency (ω cal) of the calibration current lies below the transition frequency of the low-pass filter of the second evaluation circuit, a third evaluation circuit, which is connected to the output of the second evaluation circuit and which is composed of a discrete Fourier transformation circuit and an evaluator and which evaluates a part of the Hall signal that is assignable to the calibration current and uses said part to define a parameter of the second evaluation circuit and furthermore provides a signal regarding the amplitude and the phase (φ) of the signal components of the output voltage of the second evaluation circuit that are assignable to the calibration current of defined frequency (ω cal), wherein the signal components are extracted by the discrete Fourier transformation circuit, and a fourth evaluation circuit for generating an output signal representing the current intensity (Ip), said output signal constituting the sum of the output signal of the first evaluation circuit and the output signal of the second evaluation circuit minus the part of the output signal of the second evaluation circuit that is assignable to the calibration current and is provided by the third evaluation circuit.