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Terminal blocks, or terminal boards, are electrical connections that provide a safe and reliable process for connecting wires and cables to electrical equipment. Traditional base and cover terminal blocks consist of an insulated base with individual conductive pins, situated in columns, upon which the wire loop is placed. The cover is then closed and clamped over the wire loop and two metal contacts are firmly tightened down, securely forming an electrical connection. A wide variety of terminal block systems, devices, materials and accessories are available to meet various electrical engineering, design and installation applications.

Headers, plugs and sockets are a type of terminal block and are used to make the connections for electrical and communication systems. A header is a female terminal block that often features several receptacles for cabling. The header contains a number of pins and is attached to a circuit board where the pins come in contact with the traces on the board. The header is often a two-part device with the socket base having multiple pins, placed in a specific pattern, where the wires plug-in from the back or side.

Plugs are the male version that fits into the headers. The plug can contain one or more contacts and can come as an individual part with pins or can be installed into a molded cable or wire harness. Plug-in systems are available in many styles with various connection methods to fit the application.

Sockets, also known as receptacles, are the terminal blocks used to connect male plugs. Many different designs are available from traditional breakaway type sockets, group plugging to spring clamp or cold crimp connection. Sockets also come in panel mount and free hanging cover versions. Strain reliefs, board locks, and other accessories are often needed for tighter mounting of the socket.

Terminal blocks, including headers, plugs and sockets, provide an easily identifiable and safe method of transferring power and signals to equipment. They also provide insulation barriers, protection from accidental shorts, and secure connections while providing a clutter-free wiring environment. Designers often use them in new and replacement equipment for ease of expansion and servicing.

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