Harmonics caused by non-linear electrical loads, as form variable frequency converters, rectifiers, static continuity groups, computers, monitors, are a growing problem both for suppliers and for users of electric energy. ABB Sace has developed an active filter that can clean up the network from harmonics in a precise and reliable way. The solution for low-voltage networks is represented by two models:

The first, PQFA,  is made up of a main unit (a floor-mounted panel in which to install a control device with a maximum of two power modules) and by a maximum of three secondary units, in which up to two power modules can be installed. PQFA power modules are available with nominal operating voltages up to 600V for 50 or 60Hz. Nominal heat current for a module is maximum 225 ARMS.

The second, PQFL, is made up of a control unit and by a power section that can be installed in a IP23 panel or on a common assembly plate in IP00 execution.
Reactive power compensation can be chosen and controlled until the power factor required. The corresponding compensation capacity for each single module is given by the nominal heat power.