This product is a high-precision multifunction energy meter IC that supports EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards and is compatible with 3-phase, 3 or 4-wire (delta or wye), and other 3-phase services. It provides total (fundamental and harmonic) active, reactive (ADE7878, ADE7868 and ADE7858 only), and apparent energy, and fundamental active/reactive energy (ADE7878 only) on each phase and on the overall system