The contact determines the quality of the micro switch

The quality of the micro switch largely depends on the contact.

There are currently three main types of contacts, silver-nickel alloy, silver-cadmium alloy and pure silver.

At present, silver-nickel alloy is an ideal contact material, which has good conductivity and hardness, and is not easy to be oxidized and rusted. The silver-cadmium alloy contacts of the vibrating switch are also good in other aspects, but cadmium is a heavy metal, on the one hand, it is harmful to the human body, and on the other hand, it has poor compatibility with silver and will form small cadmium metal particles on the surface of the contact. , It may lead to an electric arc when conducting electricity.

Pure silver is actually not suitable as a contact. The conductivity is really good, but the texture of pure silver is relatively soft, and it is easy to oxidize the normally closed switch. Soft texture. If there are more contacts in the switch, it will deform. Many rust spots are also easy to generate heat, easy to burn the contacts.

In the switching process of the micro switch, the contacts of the conductive parts have higher electrical and mechanical properties and value-added models. These models are developing to the high-end market.