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There are usually three kinds of inserts used for busbar/low voltage insulators. 

The most widely used thread is copper insert.Especially, it is widely used in telecommunication cabinets,inverters,swtichgear,electrical vehicles. Because insulators need to connect copper bar inside, if using inserts in different materials may lead to electrochemical corrosion reaction. 

The second insert is made from steel.One advantage is that this material is cheaper than copper.Beside, if application has higher request for mechanical property such as twisting force, steel insert is more suitble to choose. The other insert is made from aluminium. 

The most outstanding benifit of this insert is that the material is more affordable than any other materials. However, it should be noted that the connect area ought to take preventive measures against oxidation to guarantee products' working life. 

If want to know more about busbar insulators, welcome to contact us!