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Some factors of terminal blocks quality

 The quality of the terminal block depends on the following factors:  1.design 2.material 3.processing technology. 
When choosing terminal blocks, you need pay attention to distinguish them carefully: first, look at their appearance, a good product looks like a handicraft. Second material is considered as the most important part,the insulating parts should be made of flame-retardant engineering plastics. the conductive of material should be copper, iron must not be used; Third is the thread processing. If the thread processing is not good, the torque is not up to the standard, then the role of connecting the wire will be lost. The easiest inspection method is: visual inspection (look at the appearance); weigh the weight (check whether cutting material); burn with fire (flame retardant); test torque.

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