Here are the key points about relay materials:

Contact Materials: The materials used in the contacts of a relay (the part that opens or closes the circuit) are crucial for performance. Common materials include: Silver alloys: Silver is commonly used because of its excellent conductivity and resistance to corrosion. However, silver alloys (such as silver-cadmium oxide or silver-nickel) are often used to improve durability and resistance to arcing. Gold: Gold is sometimes used for small signal relays due to its superior conductivity and resistance to corrosion, though it is more expensive. Core Materials: The core in a relay is typically made from materials like: