Single-phase power source with inverter technology for compressed air metal plasma cutting. It's characterised by compact design, low weight, easy handling, user-friendliness, possibility to be connected to home mains (3kW) and cutting high-efficiency on small and medium thicknesses. It can be fed from motor-driven generators provided that they have an electronic regulator of the tension, a power equal to or greater than 4kVA and must not deliver a voltage greater than 260V. A minimum cutting current of 5A allows cutting operations on superimposed thin sheets, particularly useful in car body works. It's equipped with PFC (Power Factor Correction) device to reduce and stabilize the energy absorption. It's suitable for on-site jobs, even where single-phase input only is available and for small-scale productions.