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Terminal Blocks - Headers, Plugs and Sockets

Terminal blocks are versatile and cost effective connection solutions for both prototyping and production. They enable the user to make or break connections quickly and easily without the need to solder or unscrew components. The functionality of terminal blocks usually centers around either a header, plug, or socket, each of which has its own particular application field and its own working principle.

Header

A header on a terminal block is used to make electrical connections to a PCB. The header consists of a base, usually made of plastic, with metal pins embedded in it. These metal pins are pushed onto pads on the PCB. A wire is then connected to the header pin using a tool such as a screwdriver. The header helps to keep wiring organized while providing a secure electrical connection. Commonly used for prototyping or in industrial robotics, a header can be used for most electronic applications.

Plug

A plug on a terminal block is used for connecting two different wires together. In this configuration, the plug sits on top of the terminal block and is connected to a wire via a tool that is supplied by the terminal block manufacturer. The other wire is then inserted into the plug. The plug provides a secure, fast, and reliable connection. It is ideal for connecting two wires together with a temperature rating of up to 105°C (221°F). A plug is commonly used in high-vibration environments, such as in automotive manufacturing.

Socket

The socket part of a terminal block is typically mounted on the side of the terminal block and is used to provide electrical connections to other wired devices such as sensors, actuators, and other terminals. The socket is normally soldered onto the PCB and is connected to a wire from a device, such as a temperature sensor. The socket can also be used to connect two wired devices together, though this is not its primary application. Due to its connection strength, a socket is great for automated systems that require constant cycling and frequent connections.

Terminal blocks provide a cost effective, versatile, and easy to use solution for connecting wires in a variety of applications. The header, plug, and socket each have their own particular working principle and application fields. The header is used to make electrical connections to a PCB. The plug is used for connecting two different wires together. And the socket is commonly used for connecting wired devices together.

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