Ring main unit（RMU）
Designed for modern secondary distribution networks, our Outdoor Ring Main Unit (RMU) is a highly reliable, compact, and maintenance-free medium voltage switchgear. It integrates a fully sealed SF6 (or Eco-gas) insulated RMU within a robust, weatherproof metallic enclosure (Ring Main Kiosk). Engineered to withstand harsh outdoor environments—from high-humidity coastal areas to dusty industrial zones—it ensures continuous power supply and grid safety. Ideal for urban distribution, wind/solar power plants, and industrial parks.
Product Description
Designed for modern secondary distribution networks, our Outdoor Ring Main Unit (RMU) is a highly reliable, compact, and maintenance-free medium voltage switchgear. It integrates a fully sealed SF6 (or Eco-gas) insulated RMU within a robust, weatherproof metallic enclosure (Ring Main Kiosk). Engineered to withstand harsh outdoor environments—from high-humidity coastal areas to dusty industrial zones—it ensures continuous power supply and grid safety. Ideal for urban distribution, wind/solar power plants, and industrial parks.
Core Features & Advantages
Weatherproof & Anti-Corrosion Enclosure: Constructed with high-grade stainless steel (or optional C4/C5 marine-grade coating), ensuring an IP54/IP55 rating for the outer enclosure and IP67 for the inner gas tank. Completely flood and dust resistant.
Ultimate Safety (IAC Rated): Tested for Internal Arc Classification (IAC AFLR). Features an independent pressure relief channel directing arc gases downwards into the cable trench, maximizing public and operator safety.
Compact & Maintenance-Free: The fully insulated sealed tank isolates all live parts from environmental impacts. Design life exceeds 25 years with zero OPEX for the high-voltage compartment.
Smart Grid Ready (Automation): Can be easily upgraded to a Smart RMU. Compatible with motorized operation, Fault Passage Indicators (FPI), and integrated Remote Terminal Units (RTU) supporting IEC 61850 / DNP3 protocols for SCADA integration.
Modular & Flexible: Supports highly customizable configurations (e.g., CCV, CCC, CCF, VVV) using Load Break Switches (LBS) and Vacuum Circuit Breakers (VCB) to suit various network topologies.
Technical Specifications
Applicable Standards | IEC 62271-200, IEC 62271-100, IEC 62271-103 |
Rated Voltage | 12kV / 24kV |
Rated Frequency | 50Hz / 60Hz |
Rated Current - Busbar | 630A / 1250A |
Rated Current - LBS | 630A |
Rated Current - VCB | 630A / 1250A |
Short-time Withstand Current | 21kA / 25kA (3s) |
Internal Arc Classification | IAC AFLR 21kA / 1s |
Degree of Protection | Enclosure : IP54/IP55
Gas Tank: IP67 |
Insulation Gas | SF6 / Dry Air / Eco-friendly gas |
Mechanical Endurance | 5,000 ~ 10,000 operations |
Main Applications
Renewable Energy: Wind tower internals and Solar PV collector networks.
Urban Infrastructure: Compact distribution substations in densely populated areas.
Harsh Environments: Coastal areas, mining sites, and heavy industrial plants requiring high resilience.
