A terminal block, consisting of an insulating frame and a clamping system, is an insulated connection that fastens two or more wires together. In a screw category terminal block, wires are clamped down to a metal part (mostly metal) by the screw. This gives the benefit of connecting more than one circuit to other circuits. There are various terminal blocks, including barrier strips, modular terminal blocks, PCB terminal blocks, and power distribution blocks.

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