The medium frequency holding furnace combines high productivity with economical operation, providing pourable molten metal 24 hours a day without interruption. This medium frequency holding furnace is suitable for production line that require a large amount of molten metal with little need to change alloys, and when operating in multiple shifts, take advantage of the heat preservation performance of this electric furnace to transform melting operations to take advantage of off-peak electricity costs or to achieve energy efficiency. consumption is minimized.