The FA type filters, are designed to reduce the presence of non-
sinusoidal currents, generated by U.P.S., in industrial networks.
The TUNED FILTER type FA is a PASSIVE system, designed
by correctly tuning the frequency of the bank of capacitors with
a three-phase inductance. In this way, it generates a low
impedance route, that is preferentially chosen by the tuned
harmonic to be reduced.