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Terminal Blocks - Headers, Plugs and Sockets

Terminal blocks, also known as terminal boards, headers, plugs, and sockets are devices used to terminate wiring or electronic components and to provide a secure connection. They are usually made of plastic and metal. Terminal blocks are typically used for power, data, control, and signal connections. They provide fast and secure connections for wiring and electronic components including power lines, switches, and motors.

Terminal blocks have various application fields, depending on the specific purpose. Common application of terminal blocks include electrical power distribution, industrial automation, automotive, renewable energy, telecommunication systems, as well as aerospace and defence equipment.

The working principle behind a terminal block can be summarized as follows. Each terminal block is composed of two or more sockets and contacts. These sockets are designed to accept the corresponding wires or cables and make electrical contact with them. Depending on the model, the electrical contact is made either by direct connection or by inserting plugs into the sockets. As the cables are inserted, they are gripped by the clamps which provide strain relief and electrical current conduction.

The contact material within the terminal block ensures a secure connection and no current leakage. The contact resistance between the pin and the terminal determines the connection quality. By choosing appropriate terminal blocks, users can benefit from increased electrical efficiency, longevity, safety, and lower maintenance costs.