Device for Determining a Current Flowing Through a Current Conductor, and an Electrical System having such a Device

A device for determining a current flowing through a conductor is disclosed. The device includes a magnetic field sensor unit having at least one first sensor element and a second sensor element, each of which detects a magnetic field strength along a detection direction. The device is designed to determine the current according to the magnetic field strengths detected by way of the first sensor element and the second sensor element. The conductor has a constriction transversely to the longitudinal direction of the conductor, and the magnetic field sensor unit is positioned on the conductor in such a way that the first sensor element is positioned above a first region of the conductor and the second sensor element is positioned above a second region of the conductor, the first region and the second region differing from one another in width due to the constriction. The first sensor element and the second sensor element each use a planar measuring method and each have a detecting device which is parallel to the main extension plane of the conductor, the detecting devices being parallel to one another. An electrical system having such a device is also disclosed.