Guolian Minsheng Securities·2026-01-19 12:28Investment Rating - The report provides a neutral investment rating for the industry [59]. Core Insights - Solid State Circuit Breakers (SSCB) represent a significant technological advancement in circuit protection, transitioning from traditional electromechanical structures to power electronic devices, which better meet the demands of DC systems for high-speed, frequent operations, and compact designs [4][21]. - The necessity for SSCBs in AI Data Centers (AIDC) is emphasized, as they are critical components in the 800V DC ecosystem, enhancing the system's capacity to handle high power density loads and ensuring safety and rapid fault protection [5][30]. - The report identifies key players in the SSCB market, including companies like ABB, Eaton, and domestic firms such as Liangxin, Chint, and Taiyong Changzheng, highlighting their innovations and contributions to the industry [32][36][39][41][43]. Summary by Sections 1. What is a Solid State Circuit Breaker? - SSCBs utilize power semiconductor devices like IGBT, MOSFET, and SiC MOSFET to achieve current interruption, addressing challenges faced by traditional mechanical circuit breakers in DC systems [4][21]. - The advantages of SSCBs include extremely fast interruption speeds, no arcing or contact wear, excellent adaptability to DC systems, and high electrical longevity and reliability [16][21]. 2. Why AIDC Needs Solid State Circuit Breakers? - The evolution of data center power supply architecture is moving towards DC systems, which reduce energy conversion losses and improve efficiency [24][26]. - The report outlines the transition from traditional AC systems to a centralized DC supply model, which enhances power density and reliability [26][30]. 3. Related Companies - ABB: A leading provider of electrical solutions, ABB's SACE Infinitus solid state circuit breaker offers rapid fault interruption and significant power loss reduction [36]. - Eaton: Known for its power management solutions, Eaton's Polaris solid state circuit breaker features fast fault interruption and is designed for data centers and renewable energy applications [39]. - Liangxin: A domestic leader in low-voltage electrical products, Liangxin is focusing on smart distribution and has developed solid state circuit breakers for high power density applications [41]. - Chint: A major player in the low-voltage electrical industry, Chint is expanding its product line to include solid state circuit breakers to meet the growing demand in renewable energy and data centers [43]. - Taiyong Changzheng: This company has been an early adopter of SSCB technology, offering products that enhance the reliability and safety of DC power systems [49].