A device designed to decrease or increase the voltage of an alternating current(AC) to make it suitable for use in your heating system. There is much qualitative range of furnace transformer that is manufactured and designed using cutting edge technology. Mostly furnace transformers are used in steel plants and aluminum industries. These transformers are available with automatic on and off cooling facilities in various sizes with on-load tap changers. Furnace transformers are used to convert mains voltage to power electronics in the electrical appliances.