A current transformer is a device used to produce an alternating current in its secondary, which is proportional to the AC current in its primary . This is primarily used when a current or voltage is too high to measure directly. Specifications: Brand: Chint Secondary current Isn: 5A Rated voltage Ue: 660V Frequency: 50/60Hz Instrument security factor(FS): 10 Operating temperature: -50°C to +40°C, humidity<80% Standards: IEC60044-1 Installation type: busbar or plate fixing Package Includes: 1 x CHINT Current Transformer BH-0.66 40Ⅰ 0.5 class 1 turn