Tasks and functions of terminal blocks
Due to the selection of high-quality materials, the electrical conductivity of the terminal can be guaranteed, and the surface is plated with silver or tin, which is anti-oxidation and anti-corrosion. Part of the circular and fork-shaped terminals are divided into different widths in the same specification as the electrical connection part to meet the different width needs of customers. The terminal insulating sleeve is in the shape of a funnel, which is easy for wire insertion. The thickness of the terminal will directly affect the current load, temperature and crimping strength.
High-quality and qualified terminal products will not break under pressure, and can still have a strong and reliable pulling force in a harsh environment. This product is actually used to facilitate the connection of wires. It is actually a piece of metal enclosed in insulating plastic. There are holes at both ends to insert the wires. There are screws for fastening or loosening. It is suitable for a large number of wire interconnections. , There are special terminal blocks and terminal boxes in the power industry.
From a functional point of view, the main task of the terminal is to make a reliable mechanical and electrical connection to the wire. The wire crimping frame is made of quenched hardened and galvanized passivated steel, and the steel screws that can withstand huge moments can firmly compress the wires. The copper conductive sheet is plated with a flexible tin-lead alloy to ensure air tightness, low resistance and connection with the wire.
In the process of using terminal blocks, contact force is one of the basic elements. That is to say, if the contact pressure is insufficient, no matter how good the conductive material is, it will not help. And if the contact force is too low, there will be displacement between the wire and the conductive sheet, resulting in oxidation pollution, increasing the contact resistance and causing overheating.
In addition, the voltage drop at the contact point of the terminal is also one of the indicators to identify the quality of the terminal. Even if a small torque is applied to the screw, the value of the voltage drop is still much lower than the required limit. At the same time, the applied torque changes in a wide range, and the voltage drop is almost unchanged. Therefore, although the torque used by different operators is different, it will not affect the quality of the connection.
