Active filters use, as their names indicate, active elements.
This type of filter is more expensive than passive filters, but much more complete in terms of their settings.
Ease of installation for dimensions
Range for 3-wire (3W model) or 4-wire (4W model) installations.
Voltage and frequency multiplication (50/60 Hz).
Reduction of harmonic currents up to order 50 (2500 Hz).
Selectable harmonic frequencies to be filtered for greater filter efficiency.
Reactive power compensation (inductive/capacitive).
Phase current balancing