Which Wall Switch Has Better Contacts?

Wall switches are electrical switches and sockets installed on the wall. They are household appliances used to connect and disconnect circuits. There are good and bad wall switches
The quality of Wall Switch depends on the contact of the switch. The contact is the contact point of the conductive parts during the switching process. The first thing to look at is the size of the contact. The bigger the better. The second thing to look at is the material of the contact. There are three types of materials for the contacts of wall switches: silver-nickel alloy, silver-cadmium alloy and pure silver.
Pure silver is used as a contact, and the conductivity is indeed good, but pure silver is relatively soft and easy to oxidize. If it oxidizes and rusts, the conductivity will be much worse, and the rust points are easy to heat up, which may burn the contacts when carrying large currents.
Silver-nickel alloy has better conductivity and hardness, and silver-cadmium alloy contacts are better in other aspects, but cadmium is a heavy metal. On the one hand, it is harmful to the human body. On the other hand, the fusion with silver is not ideal, and small cadmium metal particles will form on the surface of the contact, which may draw an arc when conducting electricity.