Terminal blocks are a type of connector assembly used in industrial applications to connect parts of electronic circuits. They are a good choice for simple circuits and have a long history of use in transportation and industrial equipment. Terminal blocks or terminal connectors are simple, useful, cost-effective and often critical components in transportation applications.
Terminal blocks are also known as screw terminals or spacer bars. They are essentially a switching device that connects two or more wires together and distributes power throughout the application. They are used as simple but powerful connectors to connect wires together without the use of solder or other interconnects in many cases.
They include conductive components with wire retention sockets, all enclosed in a one-piece plastic housing. Some terminal blocks have contact pads or feet for connecting to the PCB, but most are designed with their own housing for screwing onto machine frames, attaching to the sides of industrial electrical components, snapping into industrial rails and rack systems or mounting to the inner wall of the control panel enclosure.