ATT7022B is a high-accuracy high-reliability three-phase metering IC which is suitable for measuring three-phase three/four wire electric energy. It can measure active power, reactive power, apparent power, active energy, and reactive energy for each phase and three phases combined; It also can measure voltage RMS, current RMS, power factor, phase difference and frequency; It provides fundamental wave, harmonic energy and total energy measurement. ATT7022B is qualified for three-phase multi-function electronic energy meter.