Relays play a key role in industry, safely controlling high-power devices through low-power signals, achieving isolation between strong and weak electricity, and protecting sensitive components. Their advantages include electrical isolation, high load capacity, multi-channel control, environmental tolerance, and automatic adaptation. They are widely used in motor start and stop, safety interlocks, power distribution, HVAC control, and industrial lighting. With their reliability and flexibility, relays have become core components of automation and safety systems in manufacturing, energy, automotive and other industries, and continue to promote efficient and safe operation of industry.