Studhorse 1200 stud welders require only 30A time-delay fuses and are designed for maximum portability, proven reliability and harsh environments. Digital Start/Stop replaces a mechanical contactor for increased reliability. These 1200 Amp Drawn Arc machines weld full-base studs and fasteners from 1/4 to 5/8 inches using time-proven SCR Inverter circuitry for high-power efficiency and energy savings. Features include Step-Less .05 to 1-Second Time and Power Control; Short Circuit Protection; Corrosion Protection with a 5-year guarantee against corrosion-related failures; Pilot Current to help on dirty surfaces; Kickstart Circuit to ensure fast pull-up; Afterburn Circuit to enhance weld quality for small diameter studs; Built-In Circuit Breaker with 5-zones of thermal protection to protect components; and Individual Controls for Current and Time to reduce mode change time and errrors. At 1000 Amps, Duty Cycle is 1 stud every 10 seconds. The Sturdy Fiberglass- reinforced case protects machine when transported, dragged or dropped. Available in analog or digital models, complete systems are available with gun, cables and manual.