The Tornado series include the 8-10-15-20 kVA three/single-phase, 10-15-20-30-40-60-80-100-120 kVA three-phase models and uses double conversion on-line technology (VFI) with isolation transformer on the inverter output.

The load is powered continuously by the inverter with a filtered, stabilised and regulated sinewave supply. The input and output EMI filters considerably increase the immunity of the load to mains disturbances and surges.