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Terminal blocks - headers, plugs and sockets are a set of components used to join electrical wires, similar to the plugs and outlets that join electrical wires in homes. The purpose of a terminal block is to permit the connection of two circuit elements within an application. This type of connection is known as an interconnect. Generally, terminal blocks are used in applications requiring high current, or high voltage, which require a reliable interconnect.

The terminal blocks form an important part of the current carrying components used in PC board design. They provide the ability to easily connect and disconnect conductors without affecting other elements of the circuit board. The block allows a solid connection between two separate conductor, preventing them from shorting out or creating hazardous conditions. Generally, the smaller the terminal block, the more difficult it is to make reliable connections.

Terminal blocks typically have a plastic body, with metal connector tabs on top. Depending on the type of the terminal, the connection terminals can be through-hole or surface mount. This allows for versatility in design when considering certain requirements such as space and power. Generally, the conductors are segregated from each other and separated by electrical insulation. This ensures that when the electrical power supply is active, the currents do not mix or cross-circuit.

The design of terminal blocks can vary, but generally they consist of two metal parts that form an appropriate mechanical connection. Depending on the application, there are several types of mechanical designs; blocking off access (using retractors or an electrical seal), locking (for instance with the help of a locking screw), or latching for quick access and disconnecting operations.

Terminal blocks are used in a wide variety of applications, including carpeting, wiring, industrial equipment, energy control, and computer applications. The most common type of terminal blocks used in industry are the insulated type, which provide safety insulation between conductors. For example, the National Electric Code requires that most electrical connections be made in the junction box of an electrical panel or power source.

Generally, a terminal block is rated according to the maximum current capacity of its conductor and the cross-section of the cable coming from the wires. The ratings, along with the number of terminals, will determine the amount of power that can be delivered to a circuit. Knowing the ratings is essential when installing a terminal block; if it is too small, the fixture will be unable to handle the power required, leading to a possible electric shock or fire hazard.

In summary, terminal blocks - headers, plugs and sockets are an essential part of any electrical system or application. They provide a connection between two conductor elements to safely transfer energy, or in some cases, data. In order to ensure a reliable connection, proper installation and sizing is required.

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