An electrical current transducer is disclosed including a primary conductor bar for carrying the current to be measured, a magnetic core comprising a magnetic circuit gap, a magnetic field sensor having a circuit board and a magnetic field detector positioned in the magnetic circuit gap, and an insulating housing surrounding the magnetic core and magnetic field sensor. The primary conductor bar has connection terminal ends extending outside of the housing configured for connection to an external primary conductor. The primary conductor bar further includes a core passage section having a reduced width in comparison to the connection terminal ends extending outside of the housing thereby providing an indent within which the magnetic field detector is positioned such that a central passage of the magnetic core has a width less than the width of the primary conductor connection ends. The insulating housing comprises a main housing portion overmolded around the core passage section of the primary conductor bar, the main housing portion comprising a magnetic field sensor receiving slot configured to allow slideable insertion of the magnetic field sensor into the primary conductor bar indent for positioning in the magnetic circuit gap.