I’ve made this quick reference guide to help pick the contact materials for your relay. The abbreviations are those used by Finder.
| Abbreviation | Material | Benefits | Downsides | Used for |
| 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 |
| AgSnO2 | Silver Tin Oxide | Best Resistance to contact welding | Capacitive Loads with very large inrush currents (more than twice as much as AgCdO |
Sources: