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Terminal blocks, also known as headers, plugs and sockets, are an integral component in any electrical device. They provide a reliable connection between two electrical devices, connecting signals and power to each other. This gives them a wide range of application fields and working principles.

Connection Types

The type of terminal block and its design depends upon the application and electrical requirements. There are different types of terminal blocks, such as split-bar, barrier, conductor bar and power entry units. Each type has its own advantages and disadvantages in specific applications.

Split-Bar Terminal Blocks

Split-bar terminal blocks are widely used in industrial applications. They are used in devices with multiple power feeds, such as switchboards, control systems and LV switchgear. They offer a compact and simple way of connecting multiple wires, with fewer entanglements than with traditional terminal blocks. They also provide quick and reliable connections for large current applications. The advantage of split-bar terminal blocks is that they are easy to install and require minimal space.

Barrier Terminal Blocks

Barrier terminal blocks are designed to be used in hazardous environments or areas where high loads are present. They are primarily used in steel, mining, paper and furniture industries. The barrier terminal blocks are designed to provide easier handling and greater safety when installing and maintaining electrical systems. The advantage of barrier terminal blocks is that they offer a high degree of protection against dust and dirt.

Conductor Bar Terminal Blocks

Conductor bar terminal blocks are designed for one-off or high-volume applications. They are most used in heavy-duty industrial power distribution systems. They are designed to provide a reliable and durable connection for various types of wires and cables. Additionally, the conductor bar terminal blocks provide the possibility to quickly and easily add or remove conductors without having to disconnect the entire power system. The advantage of conductor bar terminal blocks is that they are suitable for carrying large amounts of current.

Power Entry Units

Power entry units are self-contained terminal blocks designed for quick and easy installation in control cabinets. They are typically used for switching and controlling medium voltage circuits up to 400A. Power entry units are designed to offer a reliable connection for high-load applications. They provide a secure, solid connection between the supply and the device being powered. The advantage of power entry units is that they are suitable for withstanding large currents.

Working Principle

Terminal blocks work by connecting signals and power between two electrical devices. To ensure a correct connection, it is important to match the right type of terminal block to the application. When two wires are connected to a terminal block, electricity passes between them through the connection. A terminal block can also be used to switch the power supply from one circuit to another. Also, most terminal blocks have an insulation sleeve to protect the wires from any damaging outside elements.

Conclusion

Terminal blocks are widely used in many industrial applications and electrical systems. Their application field and working principle can vary widely depending on the type of terminal block used. Nonetheless, terminal blocks are vital components in modern electrical systems, providing reliable connections and protection.

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