When using the switch, it is necessary to identify the quality. Meanwhile, it is also very important in methods and methods. What specific requirements do you need? Here we give you a detailed introduction, starting from four aspects.
1. Turn the switch first to look at the shell material. The main switch brands in the market generally choose PC materials, PC materials also known as bullet-proof glue, impact resistance, high temperature resistance, non-discoloration characteristics for the control of electrical switches is very important. Better switch front panel and back base are made of PC material, while the general switch will replace PC material with black nylon material on the base, so the cost can be reduced a lot.
2. Look at the contact point, which is the contact point of conductive parts in the process of switching. Contacts depend on size (the bigger the better) and material. At present, there are three main types of contacts: silver-nickel alloy, silver-cadmium alloy and pure silver. Silver-nickel alloy is an ideal contact material at present. It has good electrical conductivity, hardness and is not easy to oxidize and rust.
3. Silver-cadmium alloy contacts are also good in other aspects, but cadmium belongs to heavy metals. On the one hand, cadmium is harmful to human body, on the other hand, the fusion of silver is not ideal. Small particles of cadmium metal will form on the surface of contacts. When conducting electricity, arcs may be pulled out. Selection of basic computer knowledge.
4. Pure silver is not suitable for contact. It has good conductivity, but it is soft and easy to oxidize (like silver jewelry will turn black after a long time). Soft texture, more contacts on the switch will deform; oxidation rust, the conductivity will be much worse, rust is easy to heat, it is easy to burn contacts.
The quality appraisal of the switching switch must be done well from these problems, and we also need to understand these four points.
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