To facilitate attachment of a measured electric wire so as to improve workability by arranging a coil matching with a current transformer rating in each of divided magnetic bodies and wrapping a magnetic circuit whole circumference setting its one end in additive polarity and using the other end as a secondary output by means of a non-magnetic container for fixing the outer circumference.
A magnetic circuit assembly 53 is constructed of two-piece split magnetic bodies 54a, 54b and two coils 55a, 55b wound in compliance with a current transformer rating. The two magnetic bodies 54a, 54b form a complete closed magnetic circuit by abutting their cross sectional faces 54a-1, 54b-1, 54b-2, 54b-2 to each other. The outside of a non-magnetic container 56 is fastened by means of a band type fixing body 57 for magnetically binding the abutted parts between the magnetic bodies 54a, 54b more tightly. Because the container 56 is made of a resilient material, an abutted part 54c can be opened while using the abutted part between the two magnetic bodies 54a, 54b as a fulcrum. Therefore, after the abutted part 54c is opened for passing an electric wire 51 through inside, the abutted part 54c is closed again and the outer circumference of the container 56 is fastened by the band type fixing body 57.
FUJII TOMOHIRO
KONDO HIROYUKI
