What are the common problems with terminal blocks?

I. What are the common problems of terminals? (1) poor contact with the metal conductor inside the terminal is the core parts of the terminal, it will come from the external wire or cable voltage, current or signal transmission to its matching connector corresponding to the contact parts. Therefore, the contact must have excellent structure, stable and reliable contact holding force and good electrical conductivity. As a result of unreasonable structural design of contact parts, material selection errors, mold instability, processing size is poor, surface roughness, heat treatment plating and other surface treatment process is unreasonable, improper assembly, storage and use of poor environmental and operational use of improper, will be in the contact parts of the contact parts and with the parts caused by poor contact. (2) poor insulation insulator's role is to make the contact parts to maintain the correct position of the arrangement, and make the contact parts and contact parts, contact parts and shell insulation between each other. Therefore, the insulator must have excellent electrical properties, mechanical properties and process molding performance. Especially with the high-density, miniaturized terminals are widely used, the effective wall thickness of the insulator is getting thinner and thinner. This insulating materials, injection mold precision and molding process put forward more stringent requirements. Due to the insulator surface or internal metal excess, surface dust, flux and other contamination by moisture, organic material precipitates and harmful gases adsorption film and the surface of the water film fusion to form ionic conductive channels, moisture absorption, mold, aging of insulating materials, etc., will result in short-circuiting, leakage, breakdown, low insulation resistance and other insulation defects. (3) poorly fixed insulator not only plays an insulating role, usually also for the outstretched contact parts to provide protection, but also has the installation of positioning, locking fixed in the equipment function. Fixed poorly, the light impact on the contact reliability caused by instantaneous power failure, the seriousness of the product disintegration. Disintegration refers to the terminals in the state of insertion, due to materials, design, technology and other reasons leading to unreliable structure caused by the plug and socket, pin and jack between the abnormal separation, will cause control system power transmission and signal control interruption of the serious consequences. Due to unreliable design, wrong material selection, improper selection of molding process, poor quality of heat treatment, molds, assembly, fusion welding and other processes, assembly is not in place, etc. will result in poor fixation.

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