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    Abstract: To address the potential risk of rainwater backflow in underground power distribution rooms under extreme weather conditions,which could severely damage electrical equipment and trigger large-scale power outages, this study proposes a short-term submersible low-voltage switchgear design. By incorporating waterproofing measures for critical components and a sealed structural design for the cabinet, the water resistance and sealing performance of the low-voltage switchgear are significantly improved. A three-dimensional model was developed for simulation analysis to optimize the structural design, followed by experimental validation to ensure reliable operation of the switchgear under submerged conditions. Test results demonstrate that this design effectively enhances the overall performance of the low-voltage switchgear, offering critical technical support for equipment upgrades in specialized scenarios such as coastal high-humidity regions,with promising application prospects.

    Key words: low-voltage switchgear; submersible design; busbar connector; waterproof plug and socket connector; sealed design