Abstract: A clamp for measuring an electric current flowing in conductors, the clamp comprising first and second jaws (1, 2) interconnected by a hinge axis (3) to be movable between a closed position and an open position, the jaws being provided respectively with first and second annular magnetic circuit segments (4, 5), each segment (4, 5) having a proximal end (7, 8) and a distal end (9, 10) relative to the hinge, and at least the first segment (5) being mounted to rock about a rocker axis (6) parallel to a hinge axis (3), the clamp including spacer means (12) for spacing the proximal ends (7, 8) apart, which spacer means are active at least when the distal ends (9, 10) are spaced apart by a distance that is greater than or equal to a predetermined safety distance.

Abstract: A current-measuring device in accordance with the invention comprises an annular magnetic circuit having separate first and second magnetic circuit portions (1, 2) with ends suitable for coming face-to-face to form a closed magnetic circuit, a housing (5) surrounding at least the first portion (1) of the magnetic circuit the first portion being slidably mounted within the housing, magnetic flux detection means (12) for detecting a magnetic flux in the magnetic circuit; the housing includes a bearing member against which the second portion of magnetic is firmly held when slided with the first portion from a position where the second portion does not face the bearing member to a position where the second portion faces the bearing member.

Abstract: A current-measuring device in accordance with the invention comprises an annular magnetic circuit having separate first and second magnetic circuit portions (1, 2) with ends suitable for coming face-to-face to form a closed magnetic circuit, a housing (5) surrounding at least the first portion (1) of the magnetic circuit, magnetic flux detection apparatus (12) for detecting a magnetic flux in the magnetic circuit, and locking apparatus for locking the two magnetic circuit portions against each other; the device is characterized in that the locking apparatus comprise a bearing member (7) carried by the housing and pivot apparatus (7) enabling at least one of the magnetic circuit portions to pivot relative to the housing, in such a manner that during pivoting the second magnetic portion comes into contact with the bearing member and is firmly held against the first magnetic circuit portion thereby.

Abstract: The present invention relates to an electric current measuring tongs with magnetic circuit which opens by a combination of linear and rotary movements, wherein the magnetic circuit accommodated in a housing (12) consists of two elements (1, 2), of which one (2) is mounted pivotably on the housing whereas the other (1) is adapted to be moved in a linear movement relative to the first element so as to permit the pivoting of the element (2) to open the circuit. The facing plane faces (3, 4; 5, 6) of the constituent elements (1, 2) of the magnetic circuit consists of plane oblique sections intended to come into close contact during the closure of the magnetic circuit.