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Terminal blocks are a vital part of the electrical wiring system. They are used to disconnect or connect electrical wires in a safe and efficient way. They are also used to protect wiring and connected circuits from damage caused by voltage spikes or temporary lack of power. They are commonly seen as connectors for connecting high-voltage power supplies, telephone systems, audio systems, and other intricate electrical systems.

Terminal blocks are available in many types, such as board mounted terminals, DIN rail mounted terminals, barrier strips, terminal plates, panel mounted terminals, solderless wrap terminal blocks, and even modular terminal blocks. There are a variety of connection methods, such as screw type, compression type, soldering type, quick connecting type, and removable type. In addition, many terminal blocks are equipped with various functions, such as self-extinguishing, overcurrent protection, or insulation. This article focuses on the application field and working principle of DIN rail mounted, board mounted, and modular terminal blocks.

DIN Rail Mounted Terminal Blocks

DIN rail-mounted terminal blocks are one of the most popular types of terminal blocks. They mount onto standard top-hat 35mm DIN rail which is widely used in multiple industries. This type of terminal block is used for a variety of applications, including communication systems, power distribution, controlling and automation, security systems, and instrumentation systems. These terminal blocks are generally categorized into two groups: direct plug-in or modular. Direct plug-in DIN rail-mounted terminal blocks feature steel parts or blades that act as bridge contacts between the terminal connections. The modular type consists of four components: end brackets, pillar/locking spring, busbar and terminal connections.

The working principle of DIN rail-mounted terminal blocks is simple. When the pair of wires is connected to terminal strip, the steel parts or blades make contact with each other forming an electrical bridge. As the wires are connected, the blades are thrown into the wire contacts automatically. The blades provide the appropriate connection between the terminals.

Board Mounted Terminal Blocks

Board mounted terminal blocks are used to connect wires between electronic boards and other electrically powered components. They are mounted directly onto the printed circuit board (PCB) and allow for easy connection and disconnection of wires. Board mounted terminal blocks are available in multiple styles and with various connection options, such as screw, fuse, plug-in, and spring clamping. Board mounted terminal blocks can also be used for connecting power supplies, alarm systems, and other components.

The working principle of board mounted terminal blocks is the same as that of DIN rail mounted terminal blocks, but instead of blades or steel parts, there is a PCB (print circuit board). The PCB has tracks on top which provide the connection points for the wires. When the wires are connected to the PCB, a contact between the connection points is formed forming an electrical bridge between the two points.

Modular Terminal Blocks

Modular terminal blocks are one of the most versatile electrical connection solutions. They are designed to provide easy and reliable connection and disconnection of wires. They are available in various styles and sizes such as mini, plug-in, and open frame terminals. Modular terminal blocks can be used for a variety of applications, such as lighting, power distribution, control circuits, alarm systems, and other electrical and communication connections.

The working principle of modular terminal blocks is the same as that of board and DIN rail mounted terminal blocks. The terminal connections between the two points are provided by a PCB. When the two wires are connected to the PCB, blades join the two points forming an electrical bridge. This allows current to be passed between the two points.

In conclusion, terminal blocks are an important component of the electrical wiring system. They provide an efficient and reliable way to connect and disconnect wires. Three of the most commonly used types are DIN rail-mounted, board mounted, and modular terminal blocks. Each of them has a simple working principle: when the two wires are connected to the terminal blocks, a connection is formed by either blades or a PCB, that create an electrical bridge between the two connection points. This allows current to pass safely through the wires.

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