AS the control core of the whole smelting system ，medium frequency power supply unit has an unparalleled position. The level of manufacturing technology of medium frequency power supply system determines the power consumption and stability. After years of development and continuous improvement of technology, SG mainly produce KGPS-parallel circult common medium frequency power supply unit and CL-series circult energy-saving frequency power supply unit.

Aluminum shell furnace body is the most popular with small and medium-sized enterprises. The structure of furnace body is simple. It’s easy to replace wearing parts and learn to operation the machine. Of course, It’s price is relatively low. But the quality of the furnace is still very good，when the volume is less than three tons.

Using steel shell is the best way to produce an induction furnace. Any size of furnace body can be produced by steel plate. Many additional features only can be used in the steel shell furnace body，such as：furnace cover system、flue gas exhaust system、bottom blowing system and so on.

Aluminum shell square furnace is mainly suitable for small amount of melting system. It’s widely used in investment casting、powder metallurgy、Precious metal smelting（such as golden、sliver）. There are many options for the tilting mechanism.（1）electric reducer（2）manual reducer（3）hydraulic system.

Closed circuit cooling tower is used for cooling furnace bodies and Electrical power supply unit. It can keep the circuit water clean to avoid pipe block up，greatly extend the service life of induction furnace and reduce the probability of failure.

The plate heat exchangers function roughly as close to closed circuit cooling water tower, and they all make sure that cooling water is cleaner than traditional cooling methods. But in the case of larger furnace, it is more applicable than closed cooling machine.