F50/51, F50N/51N, F51BF, F68
Programmable three phase over current and earth leakage relay with current-time curve expedients to protection of MV&;HV energy transmission and distribution systems.
Its phase and neutral current inlets can be selected as 1 A or 5A.
Inlet circuit of neutral current has got an active filter which percolates the 3. Harmonic.