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Terminal blocks, headers, plugs and sockets refer to the same general type of interconnect device, but with specific designs and features that make each type unique. Terminal blocks are electrical components used to connect low-voltage and low-power circuits together in controls and electrical systems. The three common types of terminal blocks are headers, plugs and sockets.

Headers

Header terminal blocks are typically used to join power lines to a printed circuit board. They are designed with a two-part housings, consisting of a hard plastic body and a flexible tongue. The tongue helps to secure and seat the cables in place. Feature options for header terminal blocks include strain relief, soldered pins, and wire wrap terminals.

Plugs

Plug terminal blocks are used primarily for joining two or more connectors in series. Plugs have two or more pins with conductive surfaces, allowing them to securely attach wires. They are designed with a plastic, non-conductive body for electrical insulation. Common features include solderless connections, convenient clamping, and short-circuit safety.

Sockets

Socket terminal blocks are used to terminate the free ends of electrical cables to devices. They are designed to accept a male plug for connection. Like plug terminal blocks, sockets have two or more pins with conductive surfaces. Popular features include safe, snap-on latching, and convenient pluggability.

Application Field and Working Principle

Terminal blocks, headers, plugs and sockets have a wide range of applications. They are commonly used in control machines and electrical equipment, such as motors, generators, automatic control circuits, switch panels, and control boards. Their working principle is based on the principle of electrical conductivity and insulation, which involves two points of contact receiving an electrical current. The circuit is then completed when an electrical current passes through the two points of contact.

Terminal blocks, headers, plugs and sockets provide a secure and organised means of connecting circuits. They are designed to be flexible, durable, and reliable. In addition, they are available in various shapes and sizes to fit different types of wiring systems. As a result, they are versatile and widely used in various industries.

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