An Overview of Terminal Blocks

When establishing a circuit and connecting wires together, there are often many ways in which one can carry out such a process. While one of the most basic methods is to simply solder wires together, soldering can be inconsistent and lead to issues if not carried out correctly. Additionally, removing the soldered wire for reuse can also prove more difficult. With modular electrical connectors known as terminal blocks, on the other hand, wires can be connected, removed, and replaced with ease as such components open up more flexible options for connections. Terminal blocks may also provide a more organized connection hub, making troubleshooting a much easier process. With the advantages that terminal blocks bring, they can be very beneficial for a number of common applications.

In their most basic form, terminal block connectors are a type of modular block that has an insulated frame and features a conducting strip and clamping components to secure two or more wires to the assembly. As terminal block electrical components may be attached to a PCB or mounting rail with their terminal block panel mount as well as are modular in design, they facilitate the simple modification of wiring systems to meet changing requirements. There are also various terminal blocks and terminal block connection types available, and they are often classified based on their structure, device type, and termination options.

The screw-in terminal block or terminal screw type is one of the most common variations for establishing connections, and they utilize screws for securing wires. With such types, it is important to never tighten screws too much as they can damage wires.The barrier terminal block is similar to the screw-in type, utilizing screws to secure wires while providing a panel for protecting them as well. Other methods of connection for terminal blocks and strips can be found in the spring-cage and push-in type, both of which allow a ferrule covered wire to simply be inserted into the terminal block assembly. Lastly, the IDC terminal block is another major connection type, and they allow for wires to be attached to the assembly without the need for stripping insulation. Instead, the terminal block assembly has sharp blades present that will slice through insulation and establish electrical contact with the wire as it is inserted.

Beyond connection types, there are also many other terminal block connectors and terminal block accessories that may be procured for various applications. The fuse terminal block is one in which a fuse is placed within the assembly in order to provide protection to the terminal block electrical components. With terminal block accessories such as a built-in fuse failure LED circuit, one can easily tell whether the fuse is in working condition or not. The ground terminal block is similar to terminal screw block types in appearance, though they are for grounding terminal blocks and strips rather than for connecting wires. When utilizing thermocouples, conventional terminal blocks cannot be used. Instead, a thermocouple terminal block is used, that of which is specifically designed to facilitate the connection of thermocouple leads. If the space for a particular assembly is limited, multi-level terminal blocks may be used which allow for groups or clusters of blocks to be established in multi-level configurations.


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April 27, 2021
April 6, 2020

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