Strengths AC measurement range: 1 A to 1000 A Enclosure diameter: 52 mm IEC 61010 600 V CAT IV Description The C-Series model range includes powerful clamp-on current transformers for 1000 A. The round shape of the clamp jaws and the uniform coil winding ensure high accuracy and minimal phase shift. The optimal adjustment of the magnetic circuit through a pendulum joint system and a patented support system for the progressive opening of the clamp jaws facilitate operation.