SSR Relay is an electronic switching device that uses semiconductor components, typically a thyristor or triac, to switch and control the power supply to an electrical load. Unlike traditional electromechanical relays, SSR relays do not have moving parts, which makes them more reliable and durable. SSR relays are commonly used in industrial and commercial applications, such as process control, robotics, and automation, where high reliability and long-term performance are required.