... .Multi-functional 4.Infrared,RS485 5.IEC62053-21 DTSD5168 Three phase electronic multifunction watt-hour meter FUNCTIONS AND FEATURES♦ Front board ... and reactive power, voltage, current and frequency, etc. of three-phase four-wire forward and reverse. Complying with standard IEC 62053 ... , we can make according to your special requirements DTSD5168 Three phase electronic multifunction watt-hour meter