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A terminal block is a connector that terminates a single wire and connects it to a circuit or other system. Terminals come in a variety of shapes, sizes, and ratings, but they always terminate with a single wire, not multi-pole.

Terminal blocks can be provided in rows, but each terminal is connected to only one wire. Terminal block connectors are very useful in situations where semi-permanent connections are required, which may require inspection, wire replacement, repair and replacement.

Although not all terminals have PCB contact pads or feet, they always have some mechanical entities made of plastic or other insulating materials.

The most common connection method for terminal blocks is to use screws, where the wires are inserted and then clamped with a single screw. Larger terminals for large cables usually use screws to push the wires to the metal body, while terminals for thinner wires use screws to push down on the lever or flat head to press the wires against the metal insert.

Other terminals may use screwless levers, which can be considered as fish traps; when the wire is inserted, the lever is lowered, which prevents the wire from being pulled back. Another terminal type is a terminal block with screws, which is used to fix the inserted cable at one end and a plug at the other end to insert the block into the female connector.