A current sensor arrangement (400; 450; 500; 600; 700; 800) for measuring an AC electrical current, comprising: - an electrical conductor (101; 501; 601; 701; 801) having an overall elongated shape extending in a first direction, and having a predefined overall width (Wo) in a second direction, and a predefined thickness in a third direction; - a sensor device (102; 502; 602; 702; 802) comprising two sensor elements (V1, V2) spaced apart by a predefined distance (dx) along the first direction, each sensor element (V1, V2) configured for measuring a magnetic field component (Bxl, Bx2) oriented in the first direction; wherein the sensor device is configured for determining a magnetic field difference (ΔBx) or a magnetic field gradient (dBx/dx) along the first direction based on the measured magnetic field components (Bxl, Bx2), and for determining said AC current based on the magnetic field gradient or the magnetic field difference; wherein the electrical conductor comprises a first cut-out, a second cut-out, and a third cut-out, spaced (spl, sp2) apart from each other along the first direction, the first and the third cut-out (C1, C3) extending in a transverse direction from a first side of the electrical conductor, the second cut-out extending in a transverse direction from a second side of the electrical conductor opposite the first side; characterised in that the sensor device is positioned (ds, zs) relative to the electrical conductor such that a reference point of the sensor device situated in the middle between the two sensor elements (V1, V2) is located at a distance (Zs) in the range from 0.0 mm to 5.0 mm from the electrical conductor measured in the third direction; the sensor elements (V1, V2) are located such that: i) a projection of each of the two sensor elements (V1, V2) in the third direction intersects a space defined by the second cut-out, or ii) a projection of one of the two sensor elements (V1, V2) in the third direction intersects a space defined by the second cut-out, and a projection of the other of the two sensor elements (V1, V2) in the third direction intersects the electrical conductor. - an electrical conductor (101; 501; 601; 701; 801) having an overall elongated shape extending in a first direction, and having a predefined overall width (Wo) in a second direction, and a predefined thickness in a third direction; - a sensor device (102; 502; 602; 702; 802) comprising two sensor elements (V1, V2) spaced apart by a predefined distance (dx) along the first direction, each sensor element (V1, V2) configured for measuring a magnetic field component (Bxl, Bx2) oriented in the first direction; wherein the sensor device is configured for determining a magnetic field difference (ΔBx) or a magnetic field gradient (dBx/dx) along the first direction based on the measured magnetic field components (Bxl, Bx2), and for determining said AC current based on the magnetic field gradient or the magnetic field difference; wherein the electrical conductor comprises a first cut-out, a second cut-out, and a third cut-out, spaced (spl, sp2) apart from each other along the first direction, the first and the third cut-out (C1, C3) extending in a transverse direction from a first side of the electrical conductor, the second cut-out extending in a transverse direction from a second side of the electrical conductor opposite the first side; characterised in that the sensor device is positioned (ds, zs) relative to the electrical conductor such that a reference point of the sensor device situated in the middle between the two sensor elements (V1, V2) is located at a distance (Zs) in the range from 0.0 mm to 5.0 mm from the electrical conductor measured in the third direction; the sensor elements (V1, V2) are located such that: i) a projection of each of the two sensor elements (V1, V2) in the third direction intersects a space defined by the second cut-out, or ii) a projection of one of the two sensor elements (V1, V2) in the third direction intersects a space defined by the second cut-out, and a projection of the other of the two sensor elements (V1, V2) in the third direction intersects the electrical conductor. i) a projection of each of the two sensor elements (V1, V2) in the third direction intersects a space defined by the second cut-out, or ii) a projection of one of the two sensor elements (V1, V2) in the third direction intersects a space defined by the second cut-out, and a projection of the other of the two sensor elements (V1, V2) in the third direction intersects the electrical conductor.