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Terminal blocks (also known as terminal boards, barrier strips, and terminal strip) are multi-pin connectors that mechanically and electrically connect wires or cables. The connection uses head screws or cage connections to provide secure electrical contact and is used to connect two or more electrical components. They are commonly used to join wires to a printed circuit board (PCB) or to connect multiple electrical wires.

The design of a terminal block consists of a plastic enclosure with multiple holes each containing a screw contact. The number of holes available for connection is typically referred to as the pitch of the terminal block. There are two types of terminal blocks; the header (or Power Control) and the plug. The two types are used in different applications and come in different sizes.

Header terminal blocks are used in applications where electrical components are connected to the PCB. The header terminal block is made up of two main components, a base and a screw nut. The base has multiple pins designed for mating with the PCB component as well as a pairing of holes for mounting the base and restricting any movement while the screw nuts have a threaded portion for fastening. Headers are available in vertical, right angle and horizontal configurations.

Plug terminal blocks, also known as “PC plug and socket”, are primarily used in applications that require wiring for commercial DC power systems. It consists of a plastic housing that contains multiple, looped metal contacts that make contact with a shared metallic surface. The plug terminal blocks come in a variety of sizes and configurations, including solid plug, flexible plug, modular plug, and stacking plug.

The working principle of the terminal blocks depends on the type. For the header block, the working principle is based on the idea that when a wire is inserted and tightened, it will secure contact between the two metal components and create conductive path. For the plugs, the working principle is similar in that it helps to ensure that the wire is secured in place by making electrical contact between two metal components.

Terminal blocks play an important role in many applications. They make wiring easy and provide secure electrical contacts. With the different types of terminal blocks available, design engineers can find a solution suitable for their application.

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