Insulated parts are made of Nylon PA66 and have good electric and physical performance.
The wire compressing frame has the advantage of large contact area and large contacting pressure results in self locked and loose part of connection.
The conductive busbar is made of copper with coating of tin-silver alloy which has good electric conductivity and anti-corrosive performance.
The wire compressing frame is made of soft sted which has been treated with cementic, galvanization and chromic acid passivated way, finally it not only has good mechanical performance but also high anti corrosive characteristic, at par with copper made frame.