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Terminal blocks, headers, plugs and sockets are components that form a mechanism for connecting two wire circuits housed in separate pieces of electrical equipment. In some industries, the need for reliable electrical interconnection has driven the development and proliferation of these devices.

The terminal blocks, headers, plugs and sockets comprising a circuit interconnection system perform several basic functions:

• Enable the secure connections between two circuits without physical contact.
• Protect the equipment and the circuitry it contains.
• Provide a safety shield to prevent arcing and shorts.
• Make the connections in a manner that is secure, reliable and easily performed.

Terminal blocks, headers, plugs and sockets are the main devices used in the connection of electrical components. Their use helps to ensure that the circuitry can be connected safely and securely. Because of the wide range of sizes, pitch and configurations of these devices, they can be tailored to fit virtually any application.

Terminal blocks are available in a variety of styles, from standard plug-and-play types for audio and telecommunications applications, to regular and specialty types for industrial systems. The blocks typically contain a printed circuit board (PCB) or terminal board, a contact surface, and a connector assembly. The connectors may include strips of metal, adjustable spring contacts, or other devices.

Headers and sockets are components typically used to maek connections between two or more wiring or cable assemblies, or to a single cable. Headers are especially designed for use in overmolding or surface mount process. They provide a reliable, low cost alternative for making electrical connections in remote areas and for terminating power and/or signal wiring. Some header styles can accommodate multiple sizes of plugs which make them more convenient for use when individual wiring segments need to be spliced or joined.

Plugs are typically used to connect two or more cables, or to extend the length of a single cable run. The plug types currently available are either male or female and can be manufactured in a wide range of sizes. Plugs are typically available with either metal or plastic housings and can affix to either solder or crimp connection. Both solder and crimp types of plugs are commonly available for both industrial as well as aviation applications.

Sockets are typically used to provide a housing for the male connector. It is important to choose the right fit when selecting a socket for your application. Sockets are available in a variety of shapes and sizes and can be used for joining two wires or a single wire. The sockets are typically constructed of two sections, one that has a threaded contact base and the other which houses a female receptacle. The socket’s contact base is mounted on the surface mount or overmoldable circuit board and the female receptacle is then inserted into the base. This creates a secure connection which is often used in signal, RF, and power applications. The sockets may be insulated for additional safety and protection.

Terminal blocks, headers, plugs and sockets are an essential part of everyday life due to their ability to securely and reliably interconnect components in a variety of applications. Their ubiquity in the industry makes them an important part of our daily lives. They allow us to interact with the electric devices in our daily lives more efficiently and securely.

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