... . 7. Frequency, power, voltage and current full display, adjustable heating, holding time (0.1S-99.9S) 8. Used for: metal smelting, through ... phase 340-420VOutput oscillating frequency30KHZ-60KHZHeating, retain current20-120AHeating,retain time, cooling time1S-99SDuty cycle100%Cooling water desire0.2Mpa>8L/MinCooling ...