Inverter power source for the plasma cutting of metals, designed for even the most discerning professional, while being extremely simple to use for the less experienced operator to guarantee results that are always perfect. It is designed for use in light-to-medium structural steel works. The generator gives excellent quality cuts without burring on the reverse for both fine and medium thick sheets in soft steel, stainless steel, aluminium and aluminium alloys. An automatic restart device allows the continuous cutting of punched plates and grids.