Abstract: In the present current intensity transformer device, a magnetic circuit having an air-gap provided with a Hall cell, is coupled with a conductor for the current to be measured and with a measuring winding. An electric measuring circuit provides a first voltage which is a function of the magnetic field in the air-gap, and a second voltage which is a function of the current in the measuring winding. Both voltages are added together to provide a measure of variable currents, such as pulse currents or periodic currents of a strongly asymmetrical wave form, as well as direct currents or low frequency alternating currents with superposed strong high frequency undulation.