Photovoltaic combiner boxes are key combining and protection devices in photovoltaic power generation systems. They are specifically designed to combine multiple photovoltaic string inputs into one or more outputs, effectively simplifying wiring structures and improving system efficiency. The product integrates a DC protection solution, equipped with core protection components such as DC disconnect switches, fuses, surge protectors (SPDs), and DC circuit breakers. This provides overcurrent, short-circuit, and transient overvoltage protection for each photovoltaic string, ensuring safe and stable system operation under lightning strikes, grid fluctuations, or fault conditions. With its compact design and high protection level, this combiner box can be flexibly adapted to large-scale photovoltaic power plants, commercial and industrial rooftops, and residential distributed systems, enabling centralized management and rapid fault isolation after photovoltaic string combining, reducing operation and maintenance costs, and providing a solid guarantee for the long-term reliable operation of the photovoltaic system.