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Terminal blocks are widely used in industrial, instrumentation and automation applications. They are used to reliably connect and protect wires or cables, allowing user-friendly installation and re-configurability. Traditional terminal blocks are made up of two components-headers and plugs.

Headers

Header blocks consist of a metal strip to which a number of screws, terminals or posts are attached. This block provides the electrical interface between the wire and headers with the header block. Headers are generally mounted on DIN rails, chassis or printed circuit boards.

Plugs

Plugs are designed to mate with the header and provide a secure connection. They are also referred to as cable blocks, pluggable blocks or connecting blocks. These blocks contain one or more connectors that are typically used for fast, reliable and secure connections to terminal strips, wire raceways, cables or potentiometers.

Sockets

Sockets are available in single and multiple pole configurations and are suitable for use in a wide range of applications. Sockets provide an easy way to connect to electronic devices, such as potentiometers, sensors and other instruments. Sockets can be connected to a header or PCB directly or via an adapter.

Working Principle

Terminal blocks are based on a simple but effective mechanical design. The most common type of terminal block is the screw type, in which a screw is tightened to make a connection between the header and the plug. The screw makes contact on the metal of the plug and the header, thereby creating an electrical connection between the two. There are also spring-clamp types, where a spring-loaded terminal is pressed down onto a contact pad on the plug, and also insulated versions where the connection is made by a pin that is pressed onto an insulated contact pad.

Application Field

Terminal blocks are widely used in many industries such as industrial, energy, aviation, telecommunications, instrumentation and other automation applications. They are used to ensure fast, easy and reliable connections between electric, electronic and lighting devices. They are especially useful in applications where connectors and wires need to be changed or rearranged frequently. For example, they are commonly used in industrial and electrical control panels, machine tools, automation systems, cars, aircraft, ships and consumer appliances.

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