Views: 0 Author: Site Editor Publish Time: 2022-12-05 Origin: Site
The terminal block is a kind of accessory product used to realize the electrical connection, which can be divided into the category of the connector in the industry. The terminal block is used to facilitate the connection of the wire. The terminal block is a piece of metal wrapped in insulating plastic. There are holes at both ends to insert the wire. It is suitable for a large number of wire interconnections. There are special terminal blocks in the power industry.
Here is the content list:
●What are the common production materials for terminal blocks?
●What are the characteristics of terminal blocks of different materials?
Terminal blocks and connectors, and the conductive fluid used in the busbar are made of electrolytic copper (H65) as the basic material. The electrical conductivity of copper is inferior to that of silver. Because the wires connected to the terminal blocks are made of copper, the same Material, the same expansion coefficient will not cause the problem of loose connection. Common materials include thermosetting plastic EP, glass fiber reinforced nylon PA-F, thermoplastic polycarbonate PC, thermoplastic polyester PBT, thermoplastic nylon 6.6, and so on.
Thermosetting plastic EP has good geometric stability, low water absorption, and a higher tracking index than the leakage current. Terminal blocks made of it are very flame-retardant. In the case of elevated temperature, they are stable and superior to thermoplastics, but have poor toughness; glass fiber reinforced nylon has strong rigidity and hardness, compared with non-reinforced nylon, its use temperature is higher. Therefore, it is also suitable for the production of terminal blocks in the field of overvoltage protection. Reinforced nylon absorbs less moisture than non-reinforced nylon. In addition to the above differences, the other characteristics of the two materials are the same. According to UL94, the flame retardant grade of fiber-reinforced nylon ranges from HB to V0, among which V0 materials are dyed black in most cases; the thermoplastic polycarbonate PC has such features as high hardness, good impact toughness, transparency, and size. Stability, good insulation performance, and good thermal stability. Particularly suitable as a covering or marking material is transparent polycarbonate. Polycarbonate is stable to the erosion of mineral acids, saturated fatty carbohydrates, gasoline, lipids, and oils. At the same time, polycarbonate shows poor resistance to solvents, benzene=lye, acetone, and ammonia. Stress cracks may be formed when in contact with certain chemical reagents; PBT has good geometric stability, and the glass fiber reinforced material has high strength and heat resistance. Terminal blocks made of PBT also have reliable flame retardancy and excellent electrical properties; there are high requirements for the quality of the insulating shell of the combined terminal block, most of which are made of thermoplastic nylon 6.6, this plastic can be processed economically by injection molding, is not harmful to the environment, and is conducive to recycling.
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