Current-measuring device

A current-measuring device comprising an annular magnetic circuit having separate first and second magnetic circuit portions with ends suitable for coming face-to-face to form a closed magnetic circuit, a housing surrounding at least the first portion of the magnetic circuit, magnetic flux detection means for detecting a magnetic flux in the magnetic circuit, and locking means for locking the two magnetic circuit portions against each other, wherein said locking means include fastening portions of the housing extending beyond the ends of the first magnetic circuit portion on respective outer sides thereof, and wherein said second magnetic circuit portion is mounted to pivot about pivot means relative to the fastening portions between a first position in which the ends of the second magnetic circuit portion are not face-to-face with the ends of the first magnetic circuit portion and where the second magnetic circuit portion is laterally displaceable for the purpose of disengaging from the pivot means, and a second position where the second magnetic circuit portion has its ends pressed against the ends of the first magnetic circuit portion and where the second magnetic circuit portion is immobilized, the device further including means to enable the ends of the first magnetic circuit portion to move relative to the pivot means.