1728710000

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Terminal Blocks - Headers, Plugs and Sockets

Terminal blocks are a type of electrical connection widely used in many applications, including industrial, automotive, computer and consumer products. The term ‘terminal block’ typically refers to a printed circuit board or connector device that enables electrical connections between multiple lines. There are three main categories of terminal blocks – header, plug and socket.

Header Terminal Blocks

Header terminal blocks are part of a modular system that enables users to quickly connect wires or terminals with either a crimp or solder connection. This type of terminal block is a common component of printed circuit boards, possessing multiple groups of spring-loaded contacts stacked one on top of the other. The contacts are designed to accept an individual cable conductor, which can then be used to complete an electrical connection. Usually, header blocks can be easily inserted and locked in place with a small screwdriver. This makes them a popular choice for rapid prototyping.

Plug Terminal Blocks

Plug terminal blocks are similar to headers, however, instead of stacking multiple contacts side by side, they offer a single set of contacts in a housing. This form of terminal block is typically used to connect several individual wires to a single circuit, such as in an automated production process. To make the connection, the end of each wire must be inserted into the plug, making it a popular choice for applications that require plugging and unplugging of components during a process.

Socket Terminal Blocks

Socket terminal blocks have an open construction, allowing them to be mounted to the side of a printed circuit board or chassis. They typically have two rows of contacts for connecting wire or terminal, allowing the convenient and rapid connection of multiple lines. Socket terminal blocks are particularly useful for connecting multiple devices to a single circuit or allowing a single sensor to interface with multiple circuits. This type of terminal block differs from a header terminal block in its exposed design, allowing devices to be connected quickly and easily.

1728710000 Application Field and Working Principle

Terminal blocks are used in a wide range of applications, from automotive manufacturing and telecommunications, to industrial computing and consumer electronics. For instance, header and plug terminal blocks are often used in embedded systems to join multiple lines from microcontroller I/O interfaces, while socket terminal blocks are used to join two or more sensors to a single circuit. As the name implies, terminal blocks are blocking elements, rather than switching elements, and as such employ no moving parts or contacts. In most cases, they consist of a series of contacts mounted between a substrate and insulation barrier, which form electrical connections when two or more components are joined.

Header, plug and socket terminal blocks are generally classified in terms of wire or terminal size, rated current and voltage, number of connections and type of connection. Depending on the type of terminal block used, these variations can enable a wide range of applications. For instance, a socket terminal block may employ a single type of connection, typically used in low power sensing applications, while a header or plug terminal block may employ numerous types of connections, from 6 to 11mm, for commercial applications.

The main advantages of terminal blocks are their convenience, low cost and flexibility when used in different applications. As such, they form an essential part of many electrical systems and are often used in place of more expensive wiring solutions.

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