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Terminal blocks, also known as terminal boards, are used to connect two or more electrical circuits. In particular, wire-to-board terminal blocks are components used to connect wires to electronic circuits. Since the 1970s, with the development of modern electronic technology, the application field and working principle of the terminal blocks have been developed.

Terminal blocks can be divided into two main categories - traditional and Euro-style. Traditional terminal blocks are characterized by flat pins with an open or shrouded "spring" connection. These types of terminal blocks are most commonly found in industrial applications and in industrial equipment. Euro-style terminal blocks offer a standardized, modular design with an integrated plug-in system. The Euro-style terminal blocks feature a wide range of features such as Easy release latching, PCB retention clips and pluggable jumper links.

The main application areas of terminal blocks are board connectors, panel connectors and cable connectors. These applications can be found in a wide range of industries and products from white goods, electronics and computers to automotive, lighting and audio equipment.

The working principle of terminal blocks is relatively simple. Electric current passes through the terminal block from one terminal to the other terminal. The two terminals can be either fixed or movable. The most common type of connection is by soldering or crimp connections. Soldering consists of heating a metal-filled hole (called a ‘through hole’) with a soldering iron and connecting two wires. This type of connection is considered to be the most secure and reliable connection.

Terminal blocks also offer various advantages and features that include:

• Easy installation and assembly
• Cost effective design
• High quality, reliable connections
• Flexibility and custom design options
• Safety and reliablity
• High temperature resistance

Terminal blocks offer numerous benefits, including easy installation and assembly, cost-effective design, high-quality connections, and flexibility in design. These features make them ideal for most electrical applications. As technology continues to develop, the application field and working principle of terminal blocks evolves to meet the needs of industry.