... basic unit and optional modules4. 10 years back-up of integrated energy data5. Large LCD, high brightness, auto-scrolling6. High accuracy ... —Ua, Ub, Uc, Uab, Ubc, Uca,2. Current—Ia, Ib, Ic, In3. Active power – Pa, Pb, Pc, ∑P4. Reactive power –Qa ...