... -functional 4.Infrared,RS485 5.IEC62053-21 DTSD5168 Three phase electronic multifunction watt-hour meter FUNCTIONS AND FEATURES♦ ... reactive power, voltage, current and frequency, etc. of three-phase four-wire forward and reverse. Complying with standard IEC ... for one minute.*Please advise us if you have any different specifications, we can make according to your special requirements DTSD5168 Three phase ...