Silver-plated switches, oil-switch, high current model switch

Silver-plated contact surface is to prevent oxidation and reduce the contact resistance of the contact, reducing heat generation. Usually high-voltage isolation switch requires silver, and there are provisions for coating thickness and hardness, such as the thickness of 20 microns. By current, silver-plated layer and the copper react? Did not study, it is estimated it will not have any magical reaction. There was a problem plated contacts test 3 microns may be too thin coating between the static and dynamic contact due to wear, damage and other causes coating to increase the contact resistance may be required to look up the switch contact pressure of coating thickness.