Abstract: A current transducer comprising a housing including a base and a cover, a magnetic circuit mounted within a cavity of the base, the magnetic circuit comprising a magnetic core and a least one coil wound around the magnetic core, and an electric circuit comprising a first circuit board mounted within the housing, the first circuit board comprising a signal processing circuit connected to the magnetic field detector and to the coil. The transducer further comprises a second circuit board comprising one or more power amplifiers mounted thereon, the second circuit board being integrated within an inner side of a metallic support substrate forming an outer layer of said cover, the metallic support substrate fixed to the housing base to cover the cavity therein with the second circuit board forming an inner side of the cover facing the first circuit board, the first and second boards interconnected electrically by electrical interconnections.

Abstract: An open-loop electrical current transducer for measuring an electrical current flowing in a primary conductor, comprising a magnetic circuit core with an air-gap, and a magnetic field sensing device positioned at least partially in said air-gap, the magnetic field sensing device comprising a circuit board, a first magnetic field detector in the form of an ASIC mounted on the circuit board, and a second magnetic field detector in the form of a conductive pick-up coil formed on two or more layers in or on the circuit board. The outputs of the first and second magnetic field detectors are connected to a signal processing circuit generating an output signal representative of said electrical current, the output of the ASIC representing a low frequency (LF) channel and the output of the pick-up coil representing a high frequency (HF) channel.