Technological scheme of induction crucible furnaces operation with simultaneous electrical power supply by high and low frequency currents has been provided. Electrical power supply is organized by medium frequency currents during heating and melting of charge materials. Electrical power supply id done by low frequency currents during keeping the melt to necessary chemical composition and temperature. Simultaneous electrical power supply of induction furnace by low and high frequency currents allows to increase the efficiency of operation and to expand the technological capabilities of the furnace. It is proposed to use induction furnances with nonstandard 0.5-0.8 ratio of height to diameter of the crucible for large-sized charge materials.