DC contactors are critical core components in AI power supply systems, widely applied in AI data centers (AIDC), AI servers, high-voltage DC power supplies, energy storage UPS, and edge/vehicle-mounted AI equipment. Their core functions include high-voltage power distribution, load switching, surge suppression, overcurrent protection, and battery charge discharge control, with good adaptability to 48V/800V HVDC architectures, high power density and millisecond-level load fluctuations. Equipped with advanced arc extinguishing, intelligent control, low contact resistance and long mechanical life, they ensure the stability, safety and reliability of AI infrastructure. Driven by AI development, demand for higher voltage, current, reliability and intelligence of DC contactors is growing, promoting their evolution toward higher ratings, intelligent monitoring, low power consumption and integration. Proper selection of DC contactors is essential for the stable operation of AI servers and data center power systems, supporting the sustainable development of the AI industry.