... pulse4000-8000KW5Ton-12Ton150-1000HZ24 pulse8000-20000KW12Ton-40Ton150-500HZUsage: used for refining various black metal, stainless steel, nonferrous ... .Overall protection function load short-circuit, open circuit, low frequency, water shortage, over current, over voltage, phase stagger ... casting. Besides, the two furnaces can be used alternatively.Double power supply has the following advantages: ...