The terminal block has always been included in the category of the connector. In fact, the terminal block is not completely matched with the connector. With the development of the electronics industry, the use range of terminal blocks is increasing, and there are more and more types. In addition to PCB terminals, the most widely used terminals include hardware terminals, nut terminals, spring terminals, and so on. UK terminal blocks have universal mounting feet so they can be installed on U-rail NS 35 and G-rail NS 32. 1.2. The closed screw guide hole can ensure the ideal screwdriver operation. Terminal block refers specifically to: a series of combined wiring fixtures in electrical engineering. The number of terminal points in each row is different, and the model can be determined according to the needs of engineering technical parameters. The application of the terminal block is mainly reflected in: in the power electronic distribution wiring, when the equipment inside the screen is connected with the equipment outside the screen, some special wiring terminals must be passed. The combination of these wiring terminals is called a terminal block. The connector can play the role of connecting the system circuit, and the terminal block excludes the important role of the connection, and there is a disconnection property similar to the switch. With the improvement of my country's electrical engineering field and the development of the terminal technology industry, the terminal block has attracted more and more attention. The service life of the terminal block is affected by the analysis of various environmental factors.
1. Factors of the terminal block itself
Terminals are mainly composed of insulators, conductive parts and fasteners. The materials of terminal accessories, terminal structure design and coating materials are all important factors affecting terminal life:
In terms of terminal material, it is the insulating material PA or PC (for circuit board terminals, PA>; PC); the conductive material is pure copper, copper alloy or aluminum (pure copper has low resistance and good conductivity); it is a fastener screw Copper or iron (copper & iron), whether the shrapnel material is imported stainless steel.
The terminal structure and design should be suitable for the requirements of the wiring environment: the identification position is clear, the wiring is convenient and intuitive, and the fasteners are easy to use (the most advantageous shrapnel in the current range).
In terms of terminal electroplating, the film of the electroplated layer is also the main factor that directly affects the service life of the terminal. As far as gold plating and silver plating are concerned, the conductivity of silver is higher than that of gold, but the chemical stability is not as good as that of gold. The film resistance caused by silver is much greater than that of gold plating. However, the cost of gold plating is relatively high. It is recommended to use gold plating only for products with acidic or poor application environments. The contact part of the tablet is partially gold-plated, which not only ensures the improvement of the use performance, but also greatly reduces the product cost.
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HANGZHOU BALIANFANG STANDARD PARTS CO.,LTD is a modern hardware enterprise which integrates designing, manufacturing, selling and service together.
2. Wiring work terminal block using network environment
The operating environment is the most direct factor that affects the service life of the terminal block.
Terminals use a variety of external environments, either to assist wind power generation in the desert, to connect high-voltage wires in the tropical rain forest, or to install a basement in it and install it in a residential instrument box. The temperature, humidity and even the degree of corrosion in these geographical locations are different, leading to the salt spray test. With the same quality, the harsher the installation environment, the shorter the service life of the terminal. In addition, the storage environment of the terminal blocks is also the same. Some of the terminal blocks have been stored in the warehouse since production, and the performance and service life of the terminal blocks are much shorter over time.
The internal environment used by the terminal refers to the environment in which the electrical equipment installed with the terminal is in operation, that is, the operating environment. The working environment of the terminal is mainly affected by voltage and current. In the circuit, the wiring terminals that work at high voltage, high current, and high power are undoubtedly under great pressure, and the possibility of damage is also great. There are two ways of terminal damage: overvoltage damage and overcurrent damage