I’ve made this quick reference guide to help pick the contact materials for your relay. The abbreviations are those used by Finder.
|AgNi||Silver Nickel||Low Cost, popular||Everything. Resistive Loads, slightly inductive loads|
|AgNi + Au||Silver Nickel + Gold plated||Lower contact resistance||Low power loads. Use at medium power will erode the gold and turn it into an AgNi contact.|
|AgCdO||Silver Cadmium Oxide||Good Resistance to contact welding||Cadmium is toxic, and is slowly being banned.||Heavy Inductive Loads with large inrush currents|
|Best Resistance to contact welding||Capacitive Loads with very large inrush currents (more than twice as much as AgCdO|