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Terminal Blocks – Headers, Plugs and Sockets have been around for many years and are essential parts of the electrical and electronic industry. These devices have a specific application field and working principle that is important to understand to ensure proper usage and performance.

Terminal blocks, also known as terminal boards, are electrical or electronic components used to connect and secure two or more wires, cables, or printed circuit boards (PCBs). Terminal blocks may contain several terminals, and provide a convenient way to interconnect multiple wires without the need for soldering. In addition, they provide structural support and strain relief for electrical wires.

Headers are a common terminal block type. They typically feature two or more parallel bars (“headers”) with terminals evenly spaced along each bar. Headers can accept a variety of wire, with the width of the terminal determining the wire size range. Header terminal blocks are often used in applications such as prototyping, test rigs, and small production runs.

Plugs are used as a cable to cable connector, to connect wires from one cable to another. Plugs typically consist of a couple of pins that accept a multi-stranded core of wire and a spring-loaded lid. This lid is usually made of metal or sometimes plastic and springs open, like a lid of a box, upon insertion, thus providing a secure connection.

Sockets also provide a similar kind of connection as plugs, but with a different design. Sockets usually have two or more protruding pins on one end, and a recess or hole on the other. The recess or hole of the socket receives the pins of the plug, which allows for a secure connection when mated. Used in wiring applications, they are mainly used to connect a device or appliance to a wall outlet.

Terminal Blocks, headers, plugs and sockets all have their own specific application and working principle. For example, header terminal blocks are mainly used in prototyping, test rigs, and small production runs, whereas plugs are mainly used for cable to cable connections, and sockets are mainly used for wall outlet connections. It is important to understand these applications and principles in order to choose the right terminal block for the right job and to ensure proper and reliable performance.

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