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Terminal blocks, also known as headers, plugs, and sockets, are interconnecting devices used to join individual electrical wires. They can also be used to connect electrical circuits between two or more devices. The most common type are the plastic types, which are designed for electrical wiring between two devices. The basic principle behind their use is to provide a means to reduce electrical interference, reduce cable clutter, and improve safety and reliability.

Busbars are the simplest type of terminal block. Busbars are typically copper or aluminum strip conductors used for carrying large volumes of current. These are commonly used for applications in both residential and commercial areas, such as powering a central air conditioner or a large electric stove. When the busbars are connected to each other, they can form electrical pathways between the two devices, such as a main fuse board and a branch fuse board. Busbars can also be used to interconnect a wide range of electrical circuits. Busbars are known for their simple and reliable design.

Jumpers are another type of terminal blocks that are used to combine or separate different electrical wires. The most common use of jumpers is to extend two or more wires of the same size. For example, a jumper could be used to connect two lengths of 12-gauge cable. Jumpers are generally lower in cost than their copper or aluminum counterparts, and they can be used in many different circuits. However, they are not suitable for high current applications, since they can cause fuses to blow or to overload the circuit.

Terminal strips, also known as Barrier Strips, are commonly used for industrial and commercial applications. This type of terminal block is composed of two pieces that are differentiated by color. The terminal strips are used to connect one current carrying terminal to a busbar. Barrier strips are designed with multiple connection points, allowing multiple wiring connections, making them suitable for diverse and demanding applications. In contrast to jumpers, Terminal Strips are also used to combine different sized wires and to reduce the exposure of wiring to the human body.

Connectors are another type of terminal blocks. Common types used in industrial and commercial applications include spade connectors, ring terminals, and pin and socket connectors. Connectors offer several advantages compared to jumpers, busbars, and terminal strips, including quick and easy installation and a secure connection. They are also used for a variety of applications, such as joining electrical circuits in automobiles, computers, and telecommunications systems. Connectors are preferred for their resistance to corrosion and for their overall reliability.

Terminal blocks have been used for decades in a variety of applications, from residential wiring to industrial automation. Their simplicity, durability, and reliability makes them an ideal choice for a variety of electrical applications. While they do come in a variety of sizes and materials, some of the most common types are the plastic types, busbars, jumpers, barrier strips, and connectors. Knowing the basic principles of each type of terminal block will help a user make an informed decision about which type of terminal block is the best choice for their application.

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