What are the common fatal faults of terminal blocks?
There are three main fatal failures of the terminal blocks in use. What are the common failures of the terminal blocks< br> 1. Poor contact
The metal conductor inside the terminal is the core part of the terminal. It transmits the external voltage, current or signal to the contact corresponding to its matching connector, which is very important in the overall circuit. Therefore, the contact must have excellent structure, stable and reliable contact retention force and good conductivity
Due to unreasonable design of contact structure, wrong material selection, processing size deviation, unstable mold, bad storage and use environment, improper operation and use, poor contact will occur at contact parts and mating parts of the contact
2. Poor insulation
The function of the insulator is to keep the contacts in the correct position, and to insulate the contacts and the shell from each other. Therefore, insulating parts must have excellent electrical performance, mechanical performance and process shaping performance. However, due to the existence of metal residues on the surface or inside of the insulator, surface dust, welding flux and other pollution and moisture, aging of insulation materials, it is easy to cause short circuit, electric leakage, breakdown, low insulation resistance and other poor insulation phenomena
3. Poor fixation
The insulator not only plays an insulating role, but also usually provides precise neutralization protection for extended contacts, and also has the function of installation, positioning, locking and fixing on the equipment. Poor fixation may cause instant power failure due to slight impact on contact reliability, or even product disassembly. Due to unreliable design, wrong material selection, improper selection of forming process, poor quality of heat treatment, welding and other processes, improper assembly and other reasons, poor fixation will be caused
In addition, poor appearance due to coating peeling, corrosion, bumping, cracking, deformation and other reasons, poor interchangeability due to over tolerance of positioning and locking fit size, poor consistency of processing quality and other reasons are also common diseases. These kinds of faults can generally be found and eliminated in time during inspection and use