Electrical unit, comprising: - a sensor device for the sensory acquisition of a measured variable, with a sensor head for the acquisition of a magnetic and/or electrical measured variable; - at least one electrical conductor for conducting electrical current; - a shielding device (4, 5, 6, 7) for shielding the sensor device and/or the sensor head against the magnetic field which is generated by the electrical current flow by means of the at least one electrical conductor and acts as an interference field with regard to the sensor head, - the shielding device (4, 5, 6, 7) comprising a shielding element designed as a frame and/or a hollow body made of a magnetically conductive material, surrounding the electrical conductor over at least one part of the length of the at least one electrical conductor in a plane nearly perpendicular to the direction of the current flow up to an interrupter gap in order to distort and/or shift the interference field; wherein a material measure is provided which - is designed to generate a magnetic working field in order to measure it with the sensor device (2, 2'); - is rotatably pivoted; - is arranged outside of the shielding element designed as a frame and/or a hollow body and which surrounds the at least one electrical conductor and/or the shielding element designed as a frame and/or a hollow body, wherein - the sensor device and the sensor head is/are arranged within the area of a minimum of the magnetic flux density of the interference field distorted and shifted by means of the shielding device (4, 5, 6, 7) and on the side facing away from the interrupter gap. - a sensor device for the sensory acquisition of a measured variable, with a sensor head for the acquisition of a magnetic and/or electrical measured variable; - at least one electrical conductor for conducting electrical current; - a shielding device (4, 5, 6, 7) for shielding the sensor device and/or the sensor head against the magnetic field which is generated by the electrical current flow by means of the at least one electrical conductor and acts as an interference field with regard to the sensor head, - the shielding device (4, 5, 6, 7) comprising a shielding element designed as a frame and/or a hollow body made of a magnetically conductive material, surrounding the electrical conductor over at least one part of the length of the at least one electrical conductor in a plane nearly perpendicular to the direction of the current flow up to an interrupter gap in order to distort and/or shift the interference field; wherein a material measure is provided which - is designed to generate a magnetic working field in order to measure it with the sensor device (2, 2'); - is rotatably pivoted; - is arranged outside of the shielding element designed as a frame and/or a hollow body and which surrounds the at least one electrical conductor and/or the shielding element designed as a frame and/or a hollow body, wherein - the sensor device and the sensor head is/are arranged within the area of a minimum of the magnetic flux density of the interference field distorted and shifted by means of the shielding device (4, 5, 6, 7) and on the side facing away from the interrupter gap.