A budget-friendly pack of two relays with harness sockets for $12.49 at Walmart . Electronics & Hobbyist Relays
Built for panel mounting or DIN rail installation, these handle high voltage and current for industrial automation. buy relay switch
An industrial solution for motor loads up to 1.5hp. Available for $41.30 at Grainger . A budget-friendly pack of two relays with harness
Industrial Solid State Relay 60A–400A — High-Power AC Output | DC Control 3-32V, 300A Go to product viewer dialog for this item. Available for $41
Relay switches are categorized by their application, ranging from smart home automation to heavy-duty industrial or automotive use. When choosing a relay, ensure the matches your control signal (e.g., 5V for Arduino, 12V for cars) and the contact rating can handle the power of the device you are switching. Smart Home Relays
A stackable shield for Arduino that adds four independently controlled 2A relays. Available for $28.40 at DigiKey or $32.65 at RobotShop . 1 Channel Relay Module 5V DC Goliath Automation & Robotics& more Go to product viewer dialog for this item.