More about Terminal Blocks

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Terminal blocks are insulated bases used to connect wires, printed circuit boards, and other electronic components to one another. Depending on the application, a terminal block may be designed to accept clips, stripped wires, plugs or other specialized connectors. They are regularly used in telecommunications operations and as secure mounts for computer and electronic equipment circuit boards.

Wires and other components can be affixed to terminal blocks through soldering, screws, clamps, tabs, tubular screws and plugs. The most basic types of terminal blocks involve simply the plastic base, conductive metal plates and screw fittings. With screw fittings, input wires can be fitted with spade terminals (standard, locking or flanged), clamped into place or simply wound around terminal connections. Terminal block mounts include a variety of quick disconnect shapes, jumpers and specialized plugs.

Multi-level terminal blocks simplify circuit design and minimize system size. These blocks allow users to affix multiple inputs (generally up to three) to a single panel width. Modular terminal blocks can be used for a variety of power and system control applications, as well as various telecommunications systems. In telephone wiring, terminal blocks enable technicians to easily change lines by moving cross-connect wires. They also allow for relatively easy line inspection, tracking and setup procedures.

Among the specifications to look for when selecting a terminal block are its number of inputs/poles and levels, its size, its intended use, whether it is forward facing or otherwise, its connection type, its mounting, its amp rating per pole and its wire-size capacity. Certain applications, such as marine and high-temperature operations, may also preclude the use of certain materials. Terminal blocks are typically fabricated from synthetics, such as nylon and polyester, and their connectors are made of a variety of conductive metals.