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Terminal blocks are a type of electrical connector used to connect two or more conductors in a single electrical circuit. As with other types of connectors, terminal blocks come in a variety of sizes, materials, and configurations. In the world of electronics, terminal blocks are one of the most essential components as they are used to provide a safe, reliable connection for the transmission of electricity and data.

Terminal blocks belonging to the ‘Wire to Board’ category provide a safe and efficient method of connecting wires to printed circuit boards (PCBs) while maintaining a high level of safety and reliability. The WTB (wire-to-board) terminal block receives wires from the outside environment, provides electrical continuity between the wires, and continues onto the board. In comparison to other types of connectors, WTB blocks have a few substantial advantages:

• Safety: WTB blocks use insulated plastic shells to ensure maximum safety compliance.
• Reliability: The terminals are designed to provide a dependable electrical connection without straining or damaging the wire.
• Versatility: WTB blocks can be adapted to a variety of PCB designs, configurations, and applications.
• Cost-Effectiveness: WTB blocks are relatively low-cost components.

WTB terminal blocks are divided into two main categories, depending on the type of contact used to conduct the electricity: screw-type terminals and spring-type terminals. Both types encode the electrical connection using a coding system.

Screw-Type Terminals

Screw-type terminal blocks are the most commonly used type of WTB blocks. Within these blocks, the electrical connection is established by tightening a screw (or screws) over the conductor or wire. The screw is then held in place using a locknut. When using this type of terminal block, it is important to make sure that the conductor or wire is properly tightened so that the electrical connection is secure.

Screw-type terminal blocks have several distinct advantages over their spring-type counterparts. For example, they are much less susceptible to vibration, which makes them a good choice for applications that may experience sudden or sustained vibrations. Additionally, they require very little maintenance, since the connection is made permanent by the screws.

In terms of coding, screw-type terminal blocks are usually marked using an alphanumeric code. This code indicates the size of terminal and the type of material used. For example, an “M8-BR” code indicates a terminal with an 8mm diameter body made of brass.

Spring-Type Terminals

Spring-type terminal blocks (also known as PCB connector blocks) are similar to screw-type terminals in that they create an electrical connection by securing a conductor or wire. However, unlike screw-type terminals, spring-type blocks achieve this connection by using a spring-loaded mechanism. To create the connection, the conductor or wire is inserted into the terminal and then a spring-loaded mechanism (usually a lever) is used to clamp the wire in place.

Spring-type terminal blocks have several advantages over their screw-type counterparts. For example, they are more resilient to vibration, as they are designed to perform better in high-vibration applications. Additionally, they are much easier to install, as they do not require any specialized tools or the use of screws. However, one of the biggest benefits of using spring-type terminal blocks is that they allow for easy re-wiring, since the wire can be quickly detached and re-attached.

As with screw-type terminals, spring-type terminal blocks are also marked using an alphanumeric code. This code indicates the size of terminal and the type of material used. For example, an “M8-ABS” code indicates a terminal with an 8mm diameter body made of ABS plastic.

Conclusion

Terminal blocks belonging to the ‘Wire to Board’ category are essential components used to safely and efficiently connect wires to printed circuit boards (PCBs). Depending on the application, either screw-type or spring-type terminals can be used to reliably establish the electrical connection. Screw-type terminals are more reliable and require less maintenance, while spring-type terminals are more resilient to vibration and allow for easy re-wiring.

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