1. The patch touch switch contact depends on the size (the bigger the better). There are currently three main types of contacts, silver-nickel alloy, silver-cadmium alloy and sterling silver. Silver-nickel alloy is an ideal contact material at present, which has good electrical conductivity and hardness, and is not easy to oxidize and rust. Silver-cadmium alloy contacts are also better in other aspects, but the cadmium is a heavy metal, which is harmful to the human body. The fusion of silver and silver is also not ideal. It will form small particles of cadmium metal on the contact surface and conduct electricity. The arc may be pulled out. The contact of sterling silver is not suitable. The conductivity is good, but the texture of sterling silver is soft, it is easy to oxidize, the texture is soft, and the switch is deformed when the switch is more. If the rust is oxidized, the conductivity will be much worse, and the rust point will be It is easy to heat up and it is easy to burn the contacts.

2. The patch touch switch contact depends on the material. Tap the switch housing material. The main switch brands in the market use PC materials. The characteristics of impact resistance, high temperature resistance and non-discoloration are very important for controlling electrical switches. The front panel of the tactile switch and the base on the back are made of PC material.