It is an external neutral current transformer (ENCT) for Compact NSX100 equipped with Micrologic 5/6 trip unit. With 3P devices, the distributed neutral of the installation can be protected by installing this external sensor. The sensor rated current is from 25 A to 100 A. The ENCT must be connected to the Micrologic trip unit by a shielded twisted pair. The wiring maximum length is 10 m and the cross section is from 0.4 mm² to 1.5 mm².