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Types and Selection of Terminals

Jan. 11, 2021

Brass Terminal Block is an accessory product used to realize electrical connection, which is classified as a connector in the industry. Specifically speaking, the terminal is used to facilitate the connection of wires. It is actually a piece of metal enclosed in insulating plastic, with holes at both ends to insert the wires. Insert or unplug according to the connection needs to be disconnected or connected.

Small Terminal Blocks are also of all kinds, with different materials and shapes. According to the raw materials, the most common terminal block is PCB board material, in addition to metal. Except for the conductive metal inserts, the rest are insulators, which can ensure the safety of the link and avoid accidents caused by electric shock. According to the shape of the terminal, there are about two hundred specifications in the market. Mainly include fence type terminal block, fence type terminal block, spring type terminal block, spring type terminal block, straight type terminal block, plug-in terminal block, European standard terminal block, European style terminal block and so on. According to different wire connection occasions, different wiring ports are required. Different shapes can meet different needs. The quality of the terminal blocks is also very good. The quality of the terminal is firm and not easy to be damaged. The internal metal insert has excellent conductivity to ensure smooth power-on. In addition, its torsion force is also very strong.

Brass Terminal Block

Brass Terminal Block

The specifications of high-current terminal products manufactured in Europe use IEC standards, while products manufactured in the United States use UL standards. There is no unified standard when determining the power and performance specifications of terminal products, so users need to understand the difference between UL and IEC specifications.

The difference between these two standards is very large. Engineers who do not understand the method of determining product specifications will take considerable risks, because the selected devices may not reach the required power level, or the specifications of the selected devices far exceed the design requirements. In Europe, the current rating of the device is determined by monitoring the temperature of the metal conductor as the current increases. When the temperature of the metal pin is 45 higher than the ambient temperature, the measurement personnel will use the current at this time as the rated current value of the device. Another item of the IEC specification is the allowable current value, which is 80% of the maximum current. In contrast, the UL standard uses 90% of the current value when the metal conductor temperature is 30 higher than the ambient temperature as the nominal value of the current European terminal block of the device.

Therefore, there are many factors to consider when choosing a suitable terminal to complete the wiring. Generally, it is determined by the wiring environment, space, wiring area, wiring method and the voltage and current that need to be passed.

Environmental factors are one of the most important reference factors, such as the choice of terminals made of high temperature resistant materials in high temperature environments. In a humid environment, you need to choose a terminal with very good sealing performance and excellent moisture resistance. In an acid-base environment, you need to choose a material that can withstand acid and alkali.

The size of the space limits the choice of products under certain conditions. Only smaller size terminals can be selected in a narrow space. If the fixing method is rail type, but the height of the terminal plus the rail exceeds the wiring space, then you can only choose other methods Fixed terminal. If the height is enough to connect multiple cables, double or multilayer terminals are required.

The wiring area is also an important factor that affects the choice of terminals. For example, the area of the cable is 2.5 square meters. So should we actually choose 2.5 square meters or choose larger terminals? In fact, in many cases we need to choose terminals with a wiring area larger than 2.5 square meters, because in actual use we need to use not only direct wiring, but also some accessories to assist wiring, such as cold-pressed terminals Head, SC terminal, etc., so the actual wiring area will be larger than the cable area.

The selection of voltage and current is similar to the selection of the size of the terminal area. Normally, there is no problem with voltage and current, but high voltage and high current will be generated when the circuit is disconnected, so the voltage and current required in this case are far The voltage and current are much higher than the normal working environment, and these factors need to be taken into consideration in the actual selection.

The comprehensive selection of terminals needs to consider the actual use environment and foreseeable special circumstances. If you have more questions, please contact the Terminal Block Connector Factory

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