The invention relates to an arrangement and a method used for measuring current flowing in an electrical conductor (1) with a magnetic circuit (2) that has an air gap (3) for coupling to the electrical conductor (1). The air gap (3) of the magnetic circuit (2) contains a magnetic-field-sensitive component (4) that is used to measure the magnetic field generated by the electrical conductor (1), wherein, the air gap (3) of the magnetic circuit (2) contains a control core (5), wherein the control core (5) has a control winding (6) for the magnetic saturation of the control core (5). In the vicinity of the magnetic-field-sensitive component (4) there are several additional elements (7a, 7b) that are suitable for conducting interfering magnetic fields in the surroundings of the magnetic-field-sensitive component (4) independent of the control cores (5).