The TIGweld 300ST by ARCON delivers superior TIG arc ignition without annoying high-frequency radio noise that interferes with computer, communication and electronic devices. Capacitive Discharge ignition allows for no contact between materials and the electrode to avoid contamination. Features Built-in gas valve for Automatic Gas Control; smooth, stable Arc; Low DC Ripple Output; Smart Surge Control reduces slag inclusions; Digital Display; Current/Time controlled cooling fan; rugged Fiberglass Case; Corrosion Protection; Built-in Circuit Breaker; 5-zone Thermal Protection; 20-400 Amps welding Current on 240VAC, 400VAC, 480VAC or 575VAC and is Portable and lightweight for industrial welding.