Three-phase pad-mounted transformers can be directly used to supply power to three-phase loads. They integrate transformers, high- and lowvoltage switches, and protection devices into a single unit. Designed for outdoor ground installation, they feature a fully sealed and fully insulated structure, making them suitable for residential communities, commercial facilities industrial sites, and other scenarios. They can be directly connected to 10kV/20kV distribution systems to supply power to low-voltage loads. They are suitable areas such as urban roadside green belts, residential communities, and public places. For temporary construction power supply, they offer quick installation, mobility, and reusability. As miniature subst, they seal transformers, load switches, fuses, and low-voltage outgoing cabinets within a metal enclosure. Their volume is only 1/5 that of traditional distribution rooms, occupying small footprint. They can be put into operation immediately upon on-site cable connection, shortening the installation cycle to 1-3 days and reducing civil engineering investment. Fully enclosed with exposed live parts, the oil tank is sealed and maintenance-free, and the plug-in fuses are easy to replace, ensuring safety and reliability while reducing later operation and maintenance costs With built-in ring main unit functions, they provide an efficient power distribution solution for urban power grids, industrial parks, rural power grids, and temporary power supply scenarios.