There are many types of light switch selection, we must pay attention to some details in the selection, for friends who are not very able to select, we must do to understand the content, what is the specific? Let's give you a detailed introduction.
Look at the contact point of light touch switch, that is, the contact point of conductive parts in the process of switch. 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.
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, silver fusion is not ideal. Small cadmium particles will form on the contact surface, and arc may be pulled out when conducting electricity.
Pure silver is not suitable for contacts. It has good electrical 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.
Touch switch housing material lightly. 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.
Similarly, with PC materials, many switch manufacturers use domestic products (even if the standard is GE, which is actually made by domestic cooperative factories, only sold by GE). At present, there is no company in China that can produce PC materials. The so-called domestic products are generally processed with recycled materials, so the impurities are relatively high, will be very brittle, and the heat resistance is obviously not good. Poor switches may be replaced by mixtures or ABS in order to reduce the cost of front panels. These materials not only have poor impact resistance and heat resistance, but also are prone to discoloration and rough surfaces when touched more.
This is how to select the light touch switch. These methods can make it easier to select the light touch switch.
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