Feed-through terminal blocks, also known as pass-through terminal blocks or through terminal blocks, are electrical connectors used to create secure and reliable connections for electrical wires. The two-stage + earth design of feed through the terminal block allows wires to be inserted from both sides, passing through the terminal block, and contacting the internal conducting elements.

Feedthrough terminal blocks provide a convenient solution for maintenance and modifications. As the wires pass through the block, individual wires can be disconnected or added without affecting the rest of the circuit. This flexibility makes it easier to make changes or repairs in complex electrical systems.