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Terminal Blocks - Headers, Plugs and Sockets

Terminal blocks, such as headers, plugs and sockets, are the essential components in most electronic circuits. They provide connectors for electrical power and data transmission, and also serve to protect the circuits from short circuits. Their application fields and working principles can be classified into two categories; DC and AC, as discussed below.

DC Type Terminal Blocks

DC type terminal blocks are used in small electronic devices, like portable computers and mobile phones. They are usually made up of metal strips, which are shaped like miniature fuse holders and are slid into the housing of the device. Inside the terminal blocks, electrical contacts are made, so that electrical current can be routed from one component to another. The design of these blocks also allows for secure and heat-resistant connections.

When the device is powered up, the blocks connect securely and form an effective connection. The current is routed through the metal strips and then is directed to the components inside the device as desired. Once the device is powered off, the connection is broken and the components are disconnected from each other until the device is powered up again.

AC Type Terminal Blocks

AC type terminal blocks are used in large electronic systems such as vehicles, aircraft and machines. They are usually made up of metal plates and pins, which connect to the circuit board of the system. A bridge is formed between the board and the terminal blocks to provide a secure connection and also to eliminate any possibility of overload. The working principle of this type of block is similar to that of the DC type, but the connection is much stronger, due to the greater surface area of the metal plates and pins.

When the system is powered on, the connection is automatically formed between the components and the terminal blocks. Current is then directed through the bridge, where it is routed to the desired components in the device. Once the power is turned off, the connection dissolves and the components are then disconnected from each other until the system is powered on again.

Terminal blocks are essential components in electronic systems and have a wide range of applications in both DC and AC circuits. Their secure and heat-resistant connections allow for effective power and data transmission while protecting the circuits from overloads. The working principles of these types of blocks differ between the DC and AC circuits, but both provide efficient connections and reliable performance.

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