This series of products is regarded as general type steelmaking equipment, which is divided into types according to the structural patterns. The HX1 type, as a frequency-control type automatic electrode regulating system, is used for furnaces with nominal capacity under 15t; the HX2 types refer to electro-hydraulic proportional valve type automatic electrode regulating systems, with power grades divided into A, B, C and D, A is considered as a grade of normal power, which is generally used for steel casting; B is regarsed as a grade of high power or ultra-high power, which is generally used forsteel making, and it shall be used in combination with the LF furnace.