| Brand | ROCKWILL |
| Model NO. | Extensible SF6 Insulated Ring Main Unit (RMU) for 24kV Distribution Networks |
| Rated voltage | 24kV |
| Rated normal current | 400A |
| Rated short circuit breaking current | 16kA |
| Backup Power | NO |
| Series | RMR |
The Sabre RMR Series Ring Main Unit (RMU) is a medium-voltage SF6-insulated switchgear engineered for secondary distribution networks up to 24kV. Featuring a sealed stainless steel tank with SF6 gas insulation (annual leakage rate ≤0.1%) and vacuum interruption technology, it offers a 30-year service life. Available in non-extensible, extensible, and modular configurations, it supports indoor/outdoor installation and integrates advanced safety features, remote monitoring, and flexible expansion capabilities — ideal for utilities, commercial, industrial, and critical infrastructure applications.
Superior Safety Protection: Mechanical interlocks, padlocking facilities, and anti-reflex mechanisms prevent misoperation. Internal arc-rated for operator and public safety.
SF6 Gas Insulation: Sealed stainless steel tank with SF6 provides excellent dielectric performance, minimal maintenance, and immunity to harsh environmental conditions.
Long Service Life and Reliability: Robotic-welded structural integrity and high-mechanical-endurance components deliver a 30-year life expectancy.
Modular and Extensible Design: Non-extensible, extensible, and modular formats allow on-site expansion without special tools or SF6 transfer.
Remote Monitoring and Control: Seamless integration with Gemini 3 RTU for real-time gas pressure, partial discharge, and switch status monitoring. Supports remote operation and predictive maintenance.
Easy Installation and Maintenance: Factory-tested, pre-assembled modules enable fast deployment. Maintenance-free design with ≤4-hour single-bay replacement time.
Wide Environmental Adaptability: Operates from -25℃ to 60℃, up to 1000m altitude without derating, and resists pollution, sandstorms, and coastal salt spray.
Smart Grid Ready: Integrates with SCADA systems and supports auto-changeover, auto-sectionalizing, and real-time condition monitoring.
| Parameter | Details |
|---|---|
| Rated Voltage | 12kV, 15.5kV, 17.5kV, 24kV |
| Rated Current | Up to 630A |
| Rated Short-time Withstand Current | 16kA, 20kA (4 s) |
| Rated Peak Withstand Current | 40kA, 50kA |
| Insulation Medium | SF6 gas (annual leakage rate ≤0.1%) |
| Interruption Medium | Vacuum (vacuum circuit breaker) |
| Power-frequency Withstand Voltage (24kV) | 50 kV |
| Lightning Impulse Withstand Voltage (24kV) | 125 kV |
| Protection Rating—Unit | IP54 |
| Protection Rating —HV Tank | IP67 |
| Protection Rating— LV Control Box | IP54 |
| Operating Temperature Range | -25℃ to 60℃ |
| Maximum Altitude (No Derating) | 1000m |
| Mechanical Endurance—Ring Switch | M2 (5000 operations) |
| Mechanical Endurance—Circuit Breaker | M2 (5000 operations) |
| Internal Arc Rating | Up to 20kA for 1 s |
| SF6 Filled Pressure | 0.4-0.5 Bar (G) |
| Mounting Options | Freestanding (indoor/outdoor), transformer-mounted |
Ambient Temperature: -25℃ to +60℃
Altitude: ≤ 1000m (no derating required)
Relative Humidity: Daily average ≤ 95%, Monthly average ≤ 90%
Installation: Indoor or outdoor (IP54 rated, no kiosk required)
Pollution Resistance: Suitable for salt spray, sandstorms, and industrial pollution zones
Seismic Resistance: ≤ Magnitude 8
Urban & Rural Medium-Voltage Distribution Networks: Ideal for branching and distributing power in residential areas, suburban communities, and rural towns. Its compact design fits narrow installation spaces, while low leakage and long service life reduce grid operational costs. The extensible feature supports future network expansion.
Commercial & Public Facilities: Suitable for hotels, shopping centers, hospitals, office buildings, and data centers. Remote monitoring ensures 24/7 stable power supply, and non-exposed live parts plus safety interlocks protect dense human traffic. Fast installation adapts to building construction timelines.
Renewable Energy Integration: Perfect for wind and solar power projects (utility-scale and distributed). It connects renewable energy systems to the grid, stabilizes power output, and works with energy storage systems. Its environmental adaptability withstands desert, plateau, and coastal conditions.
Critical Infrastructure & Transportation: Deployed in airports, tunnels, underground railways, and ports. Complies with strict safety standards (internal arc protection, seismic resistance) and supports remote operations and maintenance to minimize on-site disruptions. Resists harsh environments like salt spray and sandstorms.
Industrial Plants: Powers manufacturing facilities (automotive, mining, cement, petroleum), water/wastewater treatment plants, and industrial parks. Flexible protection options (TLF/relay) adapt to industrial load demands, and modular expansion supports production capacity growth.
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