A current transformer (CT) is a type of transformer that is used to reduce or multiply an alternating current (AC) . It produces a current in its secondary which is proportional to the current in its primary. Specifications : Type: Current Transformer Class and turn: 0.5 class-1 IEC Ampere Ratings: 5000/5A Package Include: 1 x  SDH-0.66 170II 0.5 class-1 IEC Current Transformer