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A budget-friendly pack of two relays with harness sockets for $12.49 at Walmart . Electronics & Hobbyist Relays

Industrial Solid State Relay 60A–400A — High-Power AC Output | DC Control 3-32V, 300A Go to product viewer dialog for this item. buy relay switch

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. A budget-friendly pack of two relays with harness