Primary and Secondary Integrated Ring Main Unit Module

The primary–secondary integrated ring main unit module has been completely upgraded and integrated in accordance with State Grid's design specifications, excelling in performance, safety, protection, and user‑friendliness. The enclosure is made of ABS material with a flame‑retardant rating of V0 and an ingress protection rating of IP65, ensuring reliable operation across an ambient temperature range of –25°C to +55°C. Both the station‑side terminal and the secondary circuits adopt a modular, expandable design, replacing the conventional "discrete" configuration; this not only standardizes the system but also simplifies subsequent maintenance and operations. A terminal block‑free design effectively addresses condensation issues within outdoor ring main unit enclosures. The structure of the station‑side terminals and secondary circuits, along with internal modules and connection cables, has been standardized to accommodate modules from various manufacturers. Factory‑based assembly and mechanized installation ensure one‑time, precise alignment, resulting in a sleek, unified appearance. This approach significantly reduces on‑site commissioning time for distribution automation and enhances installation efficiency.