What is the material difference between ac and dc relay contacts?

The primary material difference between AC and DC relay contacts lies in their design and construction to handle varying electrical characteristics. AC relay contacts are often made with materials that can withstand arcing caused by the alternating current, such as silver alloys, and may have a wider gap to dissipate heat. In contrast, DC relay contacts must be designed to minimize arcing, as DC does not naturally zero out like AC; therefore, they may use materials with better conductivity or coatings to reduce wear and prolong lifespan. This distinction ensures optimal performance and reliability in their respective applications.