ArcMaster 300 description: Exceptional Performance! Embedded microprocessor with digital controls, delivering perfectly smooth, stable arc characteristics for E6010 Cellulose and low hydrogen electrodes. Smart Logic and Easy Link! Prevents damage to the internal components if installed to improper voltage. Multi voltage 208-230/460 1 or 3 phase providing maximum flexibility.Thermal Overload Protection! Indicator alerts the operator if duty cycle is exceeded or airflow is blocked.