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Terminal Blocks - Wire to Board

Terminal blocks, often called strip or plug connectors, are one of the most common devices used in electrical engineering. Connecting electric wires to electrical equipment is an important process in circuit design, and the terminal block makes the connection between wires and equipment. The terminal block (also known as a joiner block) is designed to provide conductive paths from the source to the load or device. They can provide power and/or signal connection, and they are available in a variety of styles and materials to fit a variety of needs. The two main types of terminal blocks are wire to board and wire to wire.

Wire to Board Terminal Blocks

Wire to board terminal blocks, also known as pluggable or bolt- down terminal blocks, are used to connect electric wires to equipment or boards. The terminal block has male and female connector parts. The connection is made by securing the female part of the terminal block to the board or device using a screw, and then plugging the male part of the terminal block into the female part. There are a variety of connector sizes available, and the most common sizes are 2.54mm, 3.54mm, and 5.08mm. Other sizes are available, depending on the application.

Working Principle

The wire-to-board terminal blocks work by relying on the spring forces shown in the "spring diagram". The most common type is the two- springs-in-one-block. The springs are integrated into the plastic housing of the terminal block eliminating the need for the external fixtures usually necessary with other types of electrical connectors. The springs are designed to accept a variety of wire sizes and to securely grip the wires, providing a good electrical connection. The second spring provides a grounding contact, which reduces the electrical resistance.

Applications

Wire-to-board terminal blocks are used in a variety of industries and applications, including automotive, medical, industrial, process control, and communications. The terminal block has become the industry standard for connecting electric wires to other components in many areas of engineering. Typical applications include connecting assembly boards, motor drives, panels, and more. The terminal block is a reliable, cost-effective way to make electrical connections and reduce wiring costs.

Conclusion

Wire-to-board terminal blocks have become an integral part of modern electrical engineering applications. They are simple to install, efficient, and cost effective. The variety of sizes and types make them suitable for a wide range of applications. While the traditional two-spring-in-one-block construction remains the most common, new innovations are taking terminal blocks to the next level, providing increased contact density, higher voltage ratings, and improved reliability for a wide range of applications.

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