How to judge the quality of European-style terminal blocks?

Update:22-12-2018
Summary:

At present, the specifications of the terminal blocks o […]

At present, the specifications of the terminal blocks on the market are similar. Whether the products are good or bad, we first look at the appearance. Generally, the plastic surface is smooth and free of burrs and no gaps. The color is pleasing to the eye without yellowing and dullness; the pins are evenly plated, firm and not easy to wear. No pitting, no blistering.

Next, we can test the torsion and locking force. Firstly, the nail is completely loosened and shaken. The nail will not fall out to confirm that the product has a neck-proof prevention process, and then the locking force is tested with a wire. Tighten the wire to lock the wire. During the process of pressing the wire, you can see that the nail can withstand more than the button force, the wire does not appear, the screw head groove will not collapse, and the plastic case is not deformed. Strong pulling force.

Secondly, we can open the terminal to confirm the advantages and disadvantages of the internal components of the terminal, see the crepe of the rivet, the size and specific gravity of the crimping frame, whether it is copper (can be measured by magnets, scrape the surface plating to see the inside) Whether the material is copper or yellow), the plug-in terminal should also confirm whether the clamping force, elasticity and insertion force of the clip connecting the needle holder are suitable (not easy to loose or not tight); otherwise, the material can be determined by burning the single-phase relay with fire. Whether it is flame retardant (refer to UL94-VO test standard)

The above is just a simple method for judging the European terminal. Regular manufacturers require complete testing equipment and strict testing procedures to ensure the quality of the products.