Three phase current sensor

The sensor has magnetic measuring devices each comprising a magnetic circuit (M) with two air gaps, and one Hall effect sensor disposed in each air gap. The devices are positioned on both sides of a central conductor part or a cavity for the insertion of a central conductor forming one of three phases of a conduction system. The air gaps of each magnetic circuit are disposed in a same plane, and the measuring devices are mounted on a common support plate (5). An independent claim is also included for a method for measuring current circulating in a three phase conduction system.