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Terminal blocks, headers, plugs, and sockets are electrical connectors that are widely used in industrial and commercial electronic applications. They are designed to securely and reliably connect and disconnect wires used to control and power equipment.

Terminal blocks are a type of electrical connector that enables an electrical connection to be easily and quickly made between two wires or other terminal blocks. The electrical connection is made either by using jumpers to bridge two electrical terminals together, or through snap-in/snap-out contacts.

Terminal blocks are made from various materials such as plactic, metal and rubber. The type of material and its thickness will affect the electrical properties of the terminal block including its temperature rating, current carrying capacity, dielectric strength, and any other electrical requirements.

Terminal blocks come in various sizes and configurations. The most common sizes are 4- or 8-pin blocks which can be used to connect multiple wires. Multi- or double-row versions, with up to 20 contacts, are also available. Most terminal blocks feature color-coded screw-holes for easier wire installation.

Headers and plugs are used to form a bridge between two wires that are then connected to the equipment being controlled or powered. Headers are thus the opposite of terminal blocks, as they are used to create a single connection instead of multiple. Plug-in styles are the most common and enable multiple connections to be made in a short amount of time by simply snapping the plugs into the headers.

Sockets are used to safely disconnect wires or other electrical components from a power supply. Common types include banana plugs, D-connectors, and coaxial connectors. Sockets are designed to accept specific types of plugs, and the connection between the two must be secure in order to prevent shorts and ensure safe operation.

Terminal blocks, headers, plugs, and sockets are all essential components in the safe and reliable operation of electrical equipment. With the correct use, each can help to ensure stable electrical connections which can then be used to power or control various types of devices.

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