During use, the wiring terminals of connectors may experience various adverse factors such as peeling, corrosion, bruises on the surface of the coating, flash and fracture of the plastic shell, rough machining or deformation of the close contact parts, which can lead to poor appearance.

1、 Poor insulation of connector wiring terminals

The function of the connector terminal insulator is to maintain the correct position of the contacts and to insulate them from each other, as well as from the shell. Therefore, insulation components must have excellent electrical, mechanical, and process forming properties. Especially with the widespread use of high-density and miniaturized terminal blocks, the effective wall thickness of insulators is becoming thinner and thinner. This puts forward more stringent requirements for insulation materials, Injection mold construction precision and molding process.

2、 Poor fixation of connector wiring terminals

The connector wiring terminal needs to be fixed in a specific position to achieve stable connection. If the installation is not complete or the product's insertion and extraction life cycle is insufficient, resulting in poor fixation, the mild may affect contact reliability and cause instantaneous power outage, and the serious may be product disassembly. Disassembly refers to the abnormal separation between plugs and sockets, as well as between pins and sockets, caused by unreliable structure due to material, design, process, and other reasons when the wiring terminal is in the plug-in state, which will cause serious consequences such as power transmission and signal control interruption in the control system. Due to unreliable design, incorrect material selection, improper selection of forming process, poor quality of heat treatment, mold, assembly, fusion and other processes, and inadequate assembly, poor fixation can all be caused.

3、 Poor contact of connector wiring terminals

The metal conductor inside the connector terminal block is the core part of the terminal block, which transmits power, signals, etc. to other parts in contact with it. Therefore, the metal conductor inside the terminal block must have good conductivity. If the contact design is unreasonable, the material selection is incorrect, the size is non-standard, or the electroplating treatment is improper, it can cause poor contact of the connector terminal.