| Brand | ROCKWILL |
| Model NO. | SF6 gas-insulated box-type Ring Main Unit/closed switchgear-12kV to 40.5kV |
| Rated voltage | 40.5kV |
| Rated frequency | 50/60Hz |
| Series | RMR |
The RMR series SF6 gas-insulated ring main unit (RMU) covers a wide range of medium-voltage applications from 12kV to 40.5kV. It offers a compact, fully enclosed, and fully insulated design with a long service life and maintenance-free operation. Its small footprint makes it ideal for space-constrained indoor installations, while the hermetically sealed gas tank ensures zero gas leakage during normal operation.
This versatile switchgear is widely deployed in urban distribution networks (residential complexes, commercial buildings, high-rise structures), transportation infrastructure (airports, subway stations, railways, tunnels, highways), industrial facilities (factories, mines, industrial parks), as well as renewable energy projects and data centers.
Safe & Reliable Operation:Comprehensive safety protection designs, including a full mechanical interlocking system and overload protection, ensure operational safety and effectively prevent misoperation and short-circuit risks. This provides a solid foundation for continuous, stable power system operation.
Integrated Three-Position Load Switch:The integrated three-position load switch (with closing, opening, and earthing positions) simplifies the internal structure and operating procedures. Precision mechanical linkage design significantly improves switching accuracy, coordination, and response speed, reducing operational errors and enhancing stability.
Cost-Effective & Durable:High-quality materials and advanced sealing technology deliver maintenance-free performance throughout the designed service life, eliminating costly shutdowns for routine maintenance. With excellent anti-aging and anti-corrosion properties and a service life of up to 20 years, the equipment substantially reduces full-life-cycle operating costs.
Flexible & Versatile Solutions:Supports multiple cable entry options (left, right, top, and front), freely selectable according to site layout. Modular design enables flexible unit combinations, including series and parallel configurations. Combined with insulated busbar connection technology, it accommodates both front-back and left-right cabinet layouts to suit diverse installation scenarios.
Broad Application Adaptability:The design balances standardization and customization, meeting conventional industrial and commercial distribution needs while adapting to demanding environments such as renewable energy plants, rail transit systems, and data centers. Flexible structural design readily accommodates varying voltage levels and load capacity requirements.
Efficient Outgoing & Space-Saving Design:High-capacity outgoing circuits support power delivery for high-demand equipment. Compact structural layout minimizes footprint while maintaining full performance, making it especially suitable for urban core areas and industrial parks where land resources are at a premium.
| Parameter Item | Unit | 12kV System | 24kV System | 36kV System | 40.5kV System |
|---|---|---|---|---|---|
| Rated Voltage (Ur) | kV | 12 | 24 | 36 | 40.5 |
| Power Frequency Withstand Voltage (Ud) (Ph-Gnd) | kV | 28 | 50 | 70 | 95 |
| Lightning Impulse Withstand Voltage (Up) (Ph-Gnd) | kV | 75 | 125 | 170 | 185 |
| Rated Normal Current | A | 630 / 1250 | 630 / 1250 | 630 / 1250 | 630 / 1250 |
| Rated Short-time Withstand Current (3s) | kA | 20 / 25 | 20 / 25 | 20 / 25 | 20 / 25 |
| Rated Peak Withstand Current | kA | 50 / 63 | 50 / 63 | 50 / 63 | 50 / 63 |
| Rated Frequency | Hz | 50 / 60 | 50 / 60 | 50 / 60 | 50 / 60 |
| Insulating Gas | - | SF6 | SF6 | SF6 | SF6 |
Applicable altitude: ≤ 1000m (Note: For altitudes >1000m, external insulation requires Ka correction factor adjustment).
Applicable temperature: -40°C to +40°C
Relative humidity: Daily average ≤ 95%, Monthly average ≤ 90%
Earthquake damage level: ≤ 8 degrees
Yes. The hermetically sealed gas tank ensures zero gas leakage during normal operation, eliminating the need for gas replenishment or internal inspection. With anti-aging and anti-corrosion properties, the product delivers a service life of up to 20 years, substantially reducing full-life-cycle operating costs.
Yes. The RMR series supports multiple cable entry options (left, right, top, and front), freely selectable based on site layout. The modular design enables series and parallel configurations, and insulated busbar connections accommodate both front-back and left-right cabinet layouts.
Yes. The compact structural design minimizes footprint while maintaining full performance. High-capacity outgoing circuits support high-demand equipment, making it especially suitable for urban core areas and industrial parks where land resources are at a premium.
Yes. The modular design enables flexible unit combinations with insulated busbar connection technology. On-site expansion requires no special tools or gas-handling equipment, supporting convenient and flexible configuration changes as distribution needs evolve.
The RMR series ring main unit is designed, manufactured and fully type tested in accordance with IEC 62271 standard. It adopts SF6 gas as insulating medium, and is specially developed for secondary distribution networks with stable performance and high safety.
The cabinet adopts hermetically sealed gas enclosure structure. The annual SF6 gas leakage rate is ≤0.1%. Low leakage rate greatly extends maintenance cycles and reduces long-term operation and maintenance costs.
We provide a 10-year factory warranty for this RMR series SF6 gas insulated ring main unit. When the equipment is installed and operated in strict accordance with IEC standards within specified environmental limits, any failure caused by manufacturing defects, material or workmanship problems will be covered. During the warranty period, we offer free technical support and fault troubleshooting. We also provide lifelong spare parts supply and paid maintenance service to guarantee stable operation of your ring network system.
Yes. This ring main unit is specially optimized for ring network topology. It supports looped power supply architecture and can realize rapid fault isolation, effectively limiting the outage scope and minimizing power loss in secondary distribution systems.
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