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Terminal blocks or Barrier blocks, consist of a molded insulating material with conductor connection points affixed to one side. Inside the block, one side of the contacts has removable bridge or clip connection terminals which accept bare or pre-insulated solid or stranded wire. Terminal blocks and Barrier blocks are widely used in industrial control switching equipment, wiring of Data Acquisition Systems, power supply panels, instrumentation and control systems, test and assembly projects, and many electrical products.

The number 03-82-11-12-09 refers to a specific type of terminal block often found in industrial applications. It is a type of Barrier Blocks that come with typically a 4 or 5mm spacing between wires. The terms also refers to a 4 way 2-circuit terminal block with rectangular barriers, and PCB mounting also known as "micro bridge". It is available in “DIN rail” mounting and PCB styles that provide an easy way to mount accessories and components to control panels.

The basic design of terminal blocks consists of three key elements. The first is the insulated base, usually a plastic, though glass-filled plastics are sometimes used for very large blocks. The base provides insulation between the electrical connections which cause shorts and opens. Second is the connection point, which allow new connections and modifications to be made and kept secure. These points usually employ screws, but other types exist. The third is the termination area, which is generally a barrier or plastic block that separates the connection points. This allows different circuits to be kept separate.

The working principle of Terminal Blocks and Barrier Blocks is simple. When a connection is required between two wires, a terminal and or a bridge is used to provide the connection. It can typically be used to connect wire from the backplane to the front panel of products or to connect external components. To install a terminal block, the wires to be connected must be stripped and attached to the base. This is done by either by hand-screw terminals or drilled bridge-wire connection hole. The screw terminations are connected to the terminal strip and the wires are inserted into the Drilled bridges. Once the wiring is connected, the terminal block or barrier blocks are then connected to the PCB.

Terminal blocks and Barrier blocks are used to join multiple electrical wires in a safe manner. It also keeps the connections secure and safe from accidental disconnects. These blocks are used to reduce the need for wiring harnesses in applications where individual wires must be connected together for signal purposes. They are typically used in high-reliability applications such as system telemetry, which require a reliable connection between many sources and points. This connection must resist extreme temperatures and resist corrosion.

The benefits of Terminal Blocks and Barrier Blocks are many. They provide a permanent connection between two points, eliminating the need for long wires, which can corrode or fray. They can increase safety by providing insulation between the connection points and reducing the risk of short circuits or other wiring problems. Furthermore, they allow different types of electronics to be connected together to create complex systems.

Terminal blocks and Barrier blocks are an essential component in many electrical and electronics applications. They provide a secure and reliable connection, are easy to install and maintain and help ensure a robust and reliable machine or system.

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