DC surge protectors (DC SPD) are specifically designed for DC applications such as photovoltaic power plants, energy storage systems, and industrial control cabinets. As a critical safety barrier for DC systems, they provide transient overvoltage protection and lightning surge protection. Utilizing fast-response technology, these products can dissipate surge energy within microseconds, effectively suppressing transient overvoltages caused by lightning strikes, switching operations, or grid fluctuations, preventing damage to sensitive equipment and system interruptions. They possess bidirectional fault current breaking capacity, capable of handling both forward and reverse surge impacts, ensuring comprehensive protection. Through arc suppression mechanisms such as magnetic field drive and self-excited commutation, they enhance breaking reliability and electrical life. Their compact structure integrates filtering and surge absorption elements, simplifying system design while improving protection efficiency, providing long-term stable safety assurance for photovoltaic energy storage and industrial DC systems, safeguarding core investments and operational reliability.