Terminal blocks are electrical elements, call them insulated blocks, which are used for securing two or more wires together. They are designed to simplify connecting several wires to extend reach or terminate them before directing power to a specific device. The blocks are designed with several terminals that are arranged in a strip. To use the blocks, you push the wire/s into the groove and secure them tightly with a screw.Most terminal bodies are designed using no conductor materials such as hardened plastics while the connectors
are made of conductors such as copper or aluminum. Some of the applications that use terminal blocs include electrical switches, outlets to the mains, and electrical junctions. Terminal blocks can be grouped into several categories. The commonest option is the single-feed terminal block that utilizes a single wire to wire connection. The dual-level models that use two contact levels are also common. They are mainly preferred when you want to simplify wiring and save space. Other types of terminal blocks include three-level design and the PCB mount designs.