CURRENT TRANSDUCER WITH MAGNETIC CORE ON PRIMARY CONDUCTOR

An open loop electrical current transducer (2) comprising a primary conductor bar (4, 104, 104') for carrying a current to be measured, a magnetic core (6) having a U shape formed by an end branch (6a) and lateral branches (6b) upstanding therefrom to free ends, a magnetic circuit gap (5) formed between inner surfaces (18b) of the lateral branches (6b) at the free ends of the lateral branches, a magnetic field detector (8) positioned in the magnetic circuit gap (5), and a housing surrounding the magnetic core (6) and a section of the primary conductor bar extending through the magnetic core (6) and beyond the magnetic core either side thereof. The primary conductor bar comprises a central portion (14, 114, 114') having a width (Wc) equal to the width of a magnetic field gap (Wg) such that the central portion is clamped between said lateral branches in an interference force fit.