What are the common failures of terminal blocks used in schedule life?

The plastic insulating materials and conductive parts of the terminal block are directly related to the quality of the terminal, which determine the insulating and conductive properties of the terminal, respectively. Any one terminal failure will lead to the failure of the entire system engineering. In this regard, domestic and international occurrence of painful lessons is very profound. Prevention is the purpose, analysis is the basis. In a sense, the prevention of failure is more important than the analysis of failure. It is to ensure the quality and reliability of the terminals have more realistic significance.

1, poor contact inside the terminal metal conductor 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 the structural design of the contact parts is not reasonable, the material selection error, mold instability, processing size is poor, surface roughness, heat treatment plating and other surface treatment process is not reasonable, assembly is not appropriate, storage and use of harsh environments and improper use of the operation, will be in the contact parts of the contact parts and with the parts caused by poor contact. 2, insulation insulation is the role of the insulator is to make the contact parts to keep the correct position of the arrangement, and so that contact parts Between 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 contaminants damp, organic material precipitates and harmful gases adsorption film and the surface of the water film fusion to form an ionic conductive channel, moisture absorption, mold, aging of the insulating material, etc., will cause short-circuiting, leakage, breakdown, low insulation resistance and other insulation defects. 3, poorly fixed insulator not only insulating role, usually also for the outreach of the Contact parts to provide accurate centering and protection, but also has the function of installation and positioning, locking fixed in the equipment. 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 and closure, due to materials, design, technology and other reasons leading to unreliable structure caused by the plug and socket between the pins and jacks of the abnormal separation, will cause the control system of 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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