... saving. Strong power line compensate ability, anti-power supply fluctuation, steady welding current, reliable ... oil pipeline, petrochemical, car, shipbuilding, boiler, nuclear electricity, space flight, war Industry,bridge building and outdoor working. ZX7-140 Power supply (V)220V ... ±15%. Frequency (Hz)50/60 Rated input power capacity (KVA)4.4 No load voltage (V)56 Output current ...