Input voltage compensation keeps welding parameters cinstant even when input voltage change±15%. Lowest input voltage can be 300Volts and highest one can be 470Volts. Thermal overload protection automatically shuts down the power source to prevent high repair cost Large digital volt and ammeters for easy viewing Forced-draft cooling fan Superior 6010 AND 7018 Stick welding High output and 100% duty cycle at 40°C