Terminal blocks are applied for the convenience of the wire connection, it is actually a seal pieces of metal inside the insulation plastic, with a hole at both ends that can be inserted into conductor, the screw is used to tighten or loosen, such as two wires, sometimes need to connect, sometimes need to disconnect, so we use the terminal blocks to connect them, actually it can be disconnected at any time, without having to weld them up, it is very convenient to use the terminal block.

Furthermore, the terminal blocks are suitable for a large number of wires connected. There is a special terminal block in electrical power industry called terminal box, above that are all terminals, single, double, current, voltage, ordinary, and so on. A certain pressure area is to ensure reliable contact, that can guarantee with enough electrical current.