12kV SF6 Ring Main Unit (RMU) for Medium Voltage Power Distribution
The GXGND-12 12kV SF₆ Ring Main Unit (RMU) is a compact, metal-enclosed medium-voltage switchgear engineered for reliable power distribution in modern electrical networks. Designed for 12kV distribution systems, it combines SF₆ gas insulation, modular construction, and advanced protection functions to provide safe, efficient, and maintenance-friendly operation.
All live components are enclosed within a hermetically sealed stainless-steel gas tank filled with SF₆ insulating gas, effectively protecting the internal switching devices from dust, moisture, salt spray, and other environmental contaminants. This fully sealed design significantly improves operational reliability while reducing maintenance requirements throughout the product's service life.
The GXGND-12 integrates load break switches, vacuum circuit breakers, earthing switches, fuse protection, busbars, and intelligent monitoring modules into a compact cabinet. It supports flexible configurations for ring networks, radial feeders, transformer protection, and intelligent distribution automation, making it an ideal solution for utility companies, industrial facilities, commercial buildings, renewable energy projects, and infrastructure developments.
The stainless-steel gas tank adopts a fully sealed structure with an annual SF₆ leakage rate of ≤0.1%, ensuring stable insulation performance throughout its entire service life. The sealed design effectively resists humidity, dust, pollution, and corrosive environments, making it suitable for both indoor and demanding outdoor applications.
Designed for 12kV medium-voltage distribution systems, the GXGND-12 provides rated currents up to 630A with excellent short-circuit making and breaking capabilities. The switchgear complies with IEC 62271-102 and IEC 62271-103, delivering reliable protection against overloads and short circuits while ensuring stable power supply continuity.
The modular cabinet design allows various functional units to be freely combined, including:
- Incoming feeder panels
- Outgoing feeder panels
- Transformer protection units
- Metering panels
- Circuit breaker panels
- Bus sectionalizer units
This flexibility enables customized solutions for different distribution network layouts while minimizing installation space.
With its space-saving footprint, the GXGND-12 is particularly suitable for compact substations, commercial buildings, industrial plants, underground distribution stations, and urban power distribution projects where installation space is limited.
The switchgear supports both manual and motorized operation. It can also be integrated with intelligent monitoring systems, RTUs, DTUs, SCADA platforms, and remote communication modules, enabling smart grid applications and distribution automation.
Multiple mechanical and electrical interlocking systems prevent incorrect switching operations and ensure operator safety. The integrated earthing switch, pressure-resistant enclosure, and arc-resistant design further enhance operational security during maintenance and fault conditions.
Manufactured using high-quality components and strict quality control procedures, every unit undergoes routine factory testing, including insulation tests, mechanical operation tests, gas leakage tests, and high-voltage withstand tests. The corrosion-resistant cabinet structure and maintenance-free sealed gas tank ensure reliable long-term performance with minimal servicing requirements.
The GXGND-12 SF₆ Ring Main Unit is widely used in:
- Urban medium-voltage distribution networks
- Utility substations
- Industrial plants
- Commercial buildings
- Residential communities
- Airports and railway systems
- Data centers
- Hospitals
- Renewable energy projects (solar and wind power)
- Mining and infrastructure projects
- Smart grid distribution systems
Customized configurations are available to meet different project requirements, electrical specifications, communication protocols, and installation environments.
As a professional manufacturer of medium- and low-voltage power distribution equipment, Jiangsu Changyun Intelligent Technology Co., Ltd. provides reliable OEM and ODM solutions for customers worldwide.
Our advantages include:
- Over 17 years of manufacturing experience
- Advanced CNC production equipment
- Strict IEC-compliant quality control
- Complete in-house manufacturing process
- Stable product quality
- Fast delivery
- Competitive factory-direct pricing
- Professional technical support
- Global export experience
- Customized engineering solutions
Whether for utility distribution projects or industrial power systems, the GXGND-12 delivers outstanding reliability, safety, and long-term operating value.
| Parameter | Unit | Value |
|---|---|---|
| Rated Voltage | kV | 12 |
| Rated Frequency | Hz | 50 / 60 |
| Rated Current (Busbar/Feeder) | A | Up to 630 |
| Rated Short-Time Withstand Current (4s) | kA | 20 |
| Rated Peak Withstand Current | kA | 50 |
| Rated Short-Circuit Making Current | kA | 50 |
| Insulation Medium | — | SF₆ Gas |
| Tank Protection Rating | — | IP67 |
| Enclosure Protection Rating | — | IP4X (Indoor) |
| SF₆ Gas Pressure (20°C) | bar | 1.4 |
| Annual Gas Leakage Rate | % | ≤0.1 |
| Operating Mode | — | Manual / Motorized (Optional) |
| Busbar System | — | Composite Insulation |
| Typical Dimensions (W × D × H) | mm | Approx. 500 × 1000 × 1900 (Configuration Dependent) |
Specifications can be customized according to project requirements.
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