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Terminal blocks, also known as headers, plugs and sockets, are pieces of electrical equipment used to connect two or more circuits together. This connection is usually performed through a screw or terminal strip which is crimped onto the wire. They can also be used to create a permanent electrical connection between two or more components, such as a Data Communications Interface (DCI) port or a remote terminal unit (RTU) in a control system.The range of applications that terminal blocks can be used in is broad. Industrial power and automation control processes, such as lighting, motors, monitoring and control, process control, voltage protection, and switchgear, all have applications for terminal blocks. High voltage switching and distribution, telecommunications, security systems, and other related aspects of the electronic systems design field also have terminal block uses.In terms of working principles, terminal blocks are generally comprised of two components: a switch and a connector. The switch controls the flow of electricity, while the connector collects and distributes it. This process allows for easy connection and disconnection of circuits without the need for complex re-wiring. On some models, the terminal block can also be opened to allow for modification of wiring connections without affecting the overall connection. Additionally, some models come with built-in safety features, such as thermal cutoffs and self- adjusting pressure contacts, to help prevent accidental short-circuits.Terminal blocks are widely used in a variety of fields and applications, from industrial to home automation. They are essential components for any system that requires reliable connection between two or more circuits, including those involving electricity, electronics, and communications. Due to their wide range of applications and their ability to make electrical connections simple, terminal blocks are must-have components for any system designer.