Indoor Eco‑Friendly Pure Dry Air Insulated Ring Main Unit 12kV

• 100% Clean & Non‑toxic, Zero‑cost Recycling after Decommissioning：Insulated by clean dry air without SF6 or toxic fluorinated gases. All components are clearly labeled for easy dismantling and direct recycling. Proven by field experience, it avoids safety hazards from toxic decomposition under extreme faults and saves high‑cost professional gas disposal fees for clients.

• Ultra‑compact Design for In‑situ Renovation of Old Substations：Optimized electric‑field design and miniaturized vacuum interrupters make it one of the most compact RMUs. Its narrow‑body design enables equal‑size in‑situ replacement in old substation renovation, requiring no wall breaking, expansion or concrete pouring. It significantly shortens project ROI by cutting civil‑construction duration and costs.
• Fully‑sealed System for Lifelong Maintenance‑free Operation：All primary electrical and mechanical components are sealed in a fully enclosed metal housing against dust, moisture and salt fog. Optimized mechanisms with minimal parts and no lubricants perform reliably after long‑term static standby. Field feedback confirms it avoids switching failure caused by aged lubricants and reduces routine maintenance costs greatly.

• Exclusive Visible Three‑position Design to Prevent Misjudgment：Equipped with dedicated viewing windows for operator safety. Maintenance staff can directly check the actual physical status (closed, isolated, earthed) of disconnectors visually, without indirect signals. Together with power indicators and arc‑shielded enclosures, it ensures on‑site operation safety fundamentally.

• Low‑energy Self‑powered & Lego‑style Modular Expansion：Optimized load‑break switch cabinets (for ring‑network sectioning/incoming lines) and circuit breaker cabinets (for cable/transformer protection). Matched with low‑energy tripping mechanisms and self‑powered protective relays to replace traditional fuse combinations. Standard modular components allow easy expansion like Lego blocks, avoiding outdated communication standards.

Technical Parameters