Function and Features: 1. High accuracy, stable error line, and unnecessary to calibrate within long-time operation. 2. To avoid stealing electricity through reverse connection, short-circuiting or adding magnet methods. 3. High sensitivity and small starting current, and with the special design for creeping circuit. 4. With power pulse output of coupling isolation, convenient verify and communication. 5. No mechanical abrasion, adopting safe and reliable design and high quality elements, with long life-span. 6. With breaking phase indication function, when one or two phase is broken in the circuit, there is no influence on accuracy. 7. This product meets technical requirements of static three-phase prepayment watt-hour meter specified in IEC62053-21-2003, IEC62052-11-2003.