NPW800 and NPW800R provide the measurement of apparent (S), active (P) and reactive (Q) powers of 3- or 4-wire electricity networks. The monitoring of the direction of energy flow is supplemented by management of the power factor, the tangent? and by the supervision of the network voltage and frequency. These measurements and monitoring make it possible to develop the protection functions associated with these values. 

These functions associated with an R type modular unit, thus allow the NPW800R to be used for quick replacement, by equivalence of function, of the CEE relays of the 7000 series (mechanical interchangeability).