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A terminal block (also called as connection terminal or terminal connector) is a modular block with an insulated frame that secures two or more wires together. It consists of a clamping component and a conducting strip. Due to the terminal connection, the joint of the wire can be kept proper and secure. And the wire can also be properly aligned. Terminal blocks can be classified on the basis of their structure, device type, termination options.

PCB screw terminal blocks are modular, insulated devices that mount on printed circuit boards (PCBs) and secure two or more wires together. PCB terminal block connector also known as electronic blocks, are manufactured to be mounted on a printed circuit board, or PCB. Terminal blocks are used to secure and/or terminate wires and, in their simplest form, consist of several individual terminals arranged in a long strip.

Screwless terminal blocks have spring terminals that automatically grip inserted wires and release when their levers are pressed, enabling easy, temporary connections to a PCB. Various sizes are available in two orientations (side-entry and top-entry) and two pin spacings (0.1″ and 0.2″). These terminal blocks can be combined to make longer ones, or segments can be removed to make them shorter. Each block has two pins per terminal, and they are intended for use with PCBs that have the appropriate footprints.

MCS terminal block uses high-elastic and high-quality spring clips for single-strand and multi-strand connections. The characteristic is safe, fast, and reliable and it is suitable for wire-to-wire, board-to-wire and board-to-board connections to achieve power and signal transmission.

Feed-through terminal blocks are characterized by two terminal points and a compact design. Ground terminals of the same shape are available to match the feed-through terminal blocks. All bridgeable terminal blocks can be bridged together easily with multi-conductor and function terminals. A feed-through terminal block is suitable for joining and/or connecting one or more conductors. They could have one or more connection levels that are on the same potential or insulated against one another.

The barrier terminal block is designed for power applications and integrates a transparent clamshell safety cover. Barriers can tolerate cluttered or worn wire ends to prevent electrical shorts between positions on the same terminal block and adjacent components. There are a variety of high-quality barrier-style terminal blocks in single-row, double-row, and high voltage options to fit a variety of applications. The barrier terminal blocks (sometimes called barrier terminals or barrier strips) are built with sturdy, thermoplastic materials to make them break-resistant and heat-resistant.

DIN rail terminal blocks are used to protect electrical systems against overcurrent and short-circuiting. They clip onto a DIN rail, which is a standard-size metal rail on which terminals are mounted in a control cabinet. DIN rail terminals are made from plastic, as this insulates the electrical current running through the terminal. Fused DIN rail terminals often have a hinged section containing the fuse, which can be opened up to stop the flow of electricity. Some are fitted with an LED blown fuse indicator to let you know when the fuse needs changing. Fused DIN rail terminals come with different fuse size inserts and may be color-coded to indicate the current rating. Non-fused work the same, just without the fuse protection.