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Terminal Blocks - Barrier Blocks

Terminal blocks, also known as \'barrier-blocks\', are a type of electrical connector primarily used to connect A/C and D/C conductors. They are typically used for high-power circuits, as they reduce the risk of electrical shock due to their insulation and physical barrier walls between terminals.

0387205407 Application Field

Terminal blocks are commonly used in industrial automation systems, for safety reasons they are employed in potentially hazardous areas subject to spark- or arc-creating connections. As such, they are often used to connect signal and power connectors in datacom, telecom, and general-use circuits. They are also frequently used in control systems and home automation systems.

Working Principle

The most common type of terminal block is the barrier type, which consists of two plastic insulators held together by an insulating barrier. The two parts of the insulator form a sliding barrier, which allows for two separate conductor pairs to be connected, without any physical contact between them. This prevents arcing between the connections and also provides insulation from electrical shock.

The conductor pairs are typically connected via two types of connections: screw and spring. Screws are the most common type of connection, as they provide a strong electrical connection, and can be tightened to hold the conductor securely in place. Spring connections are used when the conductor needs to be adjusted frequently, as they are designed to allow for easier movement of the conductor.

Notable Features

Terminal blocks offer several features which make them particularly useful in industrial automation systems. They can be daisy-chained to allow for multiple connections on a single wall space, and multiple conductor types can be connected at the same time. Furthermore, because they are designed with a sliding barrier, they are also considered to be more reliable than other types of electrical connectors, as they can be adjusted further if necessary. This makes them especially useful in high-power circuits, where regular maintenance and inspection are a necessity.

Safety

Safety is one of the primary features of terminal blocks, as they protect against shock and arc faults. The barrier walls of the blocks provide insulation which prevent accidental shocks, and the conducting materials of the blocks are typically made from fire-resistant material which reduces the risk of fire in the event of an electrical fault. Furthermore, most terminal blocks are designed with tight wiper contacts, which improve the electrical connection and reduce the possibility of arcing.

Conclusion

Terminal blocks are a vital part of any industrial automation system, as they provide both electrical safety and high-power connections. Their sliding barrier walls provide insulation and thus reduce the risk of electrical shock, and their tight wiper contacts ensure good electrical connections. Furthermore, they can be used to connect multiple types of conductors, and can be daisy-chained to allow for multiple connections in a single wall space. With their high degree of safety and reliability, it is no surprise that terminal blocks are so commonly used in industrial automation.

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