What is Medium Frequency Furnace? Medium frequency furnace adopts 200-2500hz medium frequency power supply for induction heating and smelting heat preservation, mainly used for smelting carbon steel, alloy steel, seed steel, and also for smelting and temperature raising of copper, aluminum and other non-ferrous metals. The equipment is small in volume, light in weight, high in rate, low in power consumption, fast in melting and the temperature rising, easy to control furnace temperature and high in productivity Working Principle of Medium Frequency Induction Water Heater The power supply mode of the furnace is different from that of the power frequency electric boiler. The 380V power frequency AC power supply is input into the intermediate frequency power supply cabinet (the intermediate frequency power supply cabinet has over-voltage protection and over-current protection. If there is an over-voltage and over-current phenomenon, it will automatically shut down for alarm