... :AC0.66KV high class AKH-0.66 current transformer is specially used for collecting residual current,and matching the electric measuring unit.This ... matching the electric measuring unit. Note:AKH-0.66 residual current transformer have two output terminals 1S1,1S2 output voltage signal 1V ... ,2S1 2S2 output current signal 2mA or 20mA,but only one signal can be ...