A Brief Introduction To The Terminal Block


Terminal block is an accessory product used to realize electrical connection, which is divided into the category of connector in industry. It is actually a piece of metal sealed in insulating plastic. There are holes at both ends to insert wires, and screws are used to fasten or loosen them. For example, two wires need to be connected sometimes and sometimes need to be disconnected. They can be connected with terminals and disconnected at any time without having to solder them or twist them together, which is quick and easy. And it is suitable for a large number of wire interconnections. In the power industry, there are special terminal blocks and terminal boxes, all of which are terminal blocks, single-layer, double-layer, current, voltage, common, breakable, etc. A certain crimping area is to ensure reliable contact and to ensure that enough current can pass.


With the increasing degree of industrial automation and the stricter and more precise requirements of industrial control, the amount of terminal blocks is gradually increasing. With the development of the electronics industry, the use of terminal blocks is increasing, and there are more and more types. In addition to PCB board terminals, the most widely used ones are hardware terminals, nut terminals, spring terminals and so on.


Classification according to the function of the terminal
According to the function of the terminal, there are: common terminal, fuse terminal, test terminal, ground terminal, double-layer terminal, double-layer conduction terminal, three-layer terminal, three-layer conduction terminal, one-in and two-out terminal, one-in and three-out terminal , Double input and double output terminal, knife switch terminal, overvoltage protection terminal, marked terminal, etc.
Classification by current
According to the current size, it is divided into ordinary terminals (small current terminals) and high current terminals (more than 100A or more than 25MM).
Classification by appearance
According to the appearance, it can be divided into: plug-in type terminal series, fence type terminal series, spring type terminal series, track type terminal series, through-wall type terminal series, etc.
1. Plug-in terminals
It is made up of two parts plug-in connection, one part presses the wire, and then plugs into the other part, which is soldered to the PCB board. The mechanical principle of the bottom connection and the anti-vibration design ensure the long-term airtight connection of the product and the reliability of the finished product. Mounting ears can be added at both ends of the socket. The mounting ears can protect the tabs to a large extent and prevent the tabs from being arranged in a bad position. At the same time, this socket design can ensure that the socket can be correctly inserted into the mother body. Receptacles can also have assembly snaps and locking snaps. The assembly buckle can be used to more firmly fix to the PCB board, and the locking buckle can lock the mother body and the socket after the installation is completed. Various socket designs can be matched with different parent insertion methods, such as: horizontal, vertical or inclined to the printed circuit board, etc., and different methods can be selected according to customer requirements. Available in both metric and standard wire gauges, it is the best-selling terminal type on the market.

2. Spring terminal
It is a new type of terminal using a spring device and has been widely used in the world's electrical and electronic engineering industries: lighting, elevator control, instrumentation, power, chemistry and automotive power.

3. Screw terminal
Circuit board terminals have always played an important role in the electronics industry and have now become an important part of printed circuit boards. Its structure and design are more sturdy in terms of convenient wiring and reliable screw connection; compact structure, reliable connection, and its own advantages; using the principle of lifting and lowering of the clamping body to ensure reliable wiring and large connection capacity; welding feet and clamping lines The body is divided into two parts to ensure that the distance when tightening the screws will not be transmitted to the solder joints and damage the solder joints;

4. Rail-type terminals
The rail-type terminal block can be installed on the U-type and G-type rails, and can be equipped with a variety of accessories, such as shorting strips, marking strips, baffles, etc. Safety.

5. Through-the-wall terminals
The through-wall terminals can be installed side by side on panels with thicknesses ranging from 1mm to 10mm, and can automatically compensate and adjust the thickness of the panel to form a terminal block with any number of poles. In addition, isolation plates can be used to increase air gaps and creepage distances. Through-wall terminal blocks are widely used in some occasions that require through-the-wall solutions: power supplies, filters, electrical control cabinets and other electronic equipment.

Post time: Jul-25-2022