GTXGN-12 Solid Insulated Ring Main Unit
Ring Main Unit GTXGN-12 Solid Insulated Ring Main Unit The GTXGN-12 Solid Insulated Ring Main Unit (RMU) is an innovative, environmentally friendly, and fully sealed
Outdoor Ring Main Unit (RMU)
Outdoor Ring Main Unit (RMU)
The Outdoor Ring Main Unit (RMU), or Switching Station, features SF6-insulated components within a metal casing. It can be customized with incoming, outgoing, connection, and power units, supporting distribution automation systems. Designed for 10-35kV power networks, it provides compact, modular, and reliable solutions for ring network, double-radiation, and terminal power supplies. The intelligent version offers real-time monitoring and control.
Key Features:
The outdoor ring cabinet has a high degree of integration, a compact structure and a small footprint. It adopts a fully insulated and fully sealed design, with excellent protection performance. It can be directly deployed outdoors without the need for building a civil construction machine room. The installation and construction are efficient and convenient. It can adapt to various harsh outdoor environments, operate stably and reliably, and also has the characteristics of simple operation and maintenance, flexible expansion and renovation, and affordable cost, suitable for various distribution scenarios such as urban distribution networks and new energy support.
Why choose Outdoor Ring Main Unit (RMU)
The outdoor ring box is compact in structure and highly integrated. It adopts a fully insulated and fully sealed design, which is safe, reliable and has strong protection performance. It can be directly installed outdoors without the need for a civil construction machine room. The construction and installation are quick, and the operation and maintenance are simple. It can adapt to various complex environments. At the same time, the investment cost is low, and the expansion and renovation are flexible. It is widely applicable to distribution scenarios such as urban power grids, industrial parks, and new energy projects.
Product Advantages
Compact and Flexible Design: The ring main unit or switching station occupies less space, offers flexible configuration, and is more cost-effective than traditional switching stations.
Strong Environmental Adaptability: Resistant to condensation, frost, salt spray, pollution, corrosion, ultraviolet exposure, small animals, and chemicals, making it suitable for harsh environments.
Modular Integration: The unit can be equipped with vacuum circuit breaker modules, high-voltage monitoring components, digital relays, metering modules, and other high-voltage devices.
Maintenance-Free and Cost-Effective: The switch station is maintenance-free with a long service life, significantly reducing operating costs.
Usage Conditions
Ambient Temperature: -35°C to +40°C.
Humidity: Daily average ≤ 95%, monthly average ≤ 90%.
Seismic Resistance: Up to magnitude 8, with horizontal acceleration ≤ 4g and vertical acceleration ≤ 0.2g.
Altitude: Not exceeding 3000m.
Environmental Considerations: No fire, explosion, or severe vibration hazards in the installation area.
Application
The outdoor ring switchgear is a compact, non-construction-required outdoor power distribution unit. Its core function is to distribute electrical energy, isolate faults, and provide ring network power supply in the medium-voltage distribution network. It is directly installed on the ground in an open area and does not require a power distribution room.
Model meaning
Technical Parameters
Overall and mounting dimensions(mm)（Reference）
Model meaning
| Outdoor Ring Main Unit (RMU) | D: | Cable distribution |
| F: | Outdoor type | |
| W: | Weather-proof | |
| K: | Switching station / ring main unit |
Technical Parameters
| Item | Technical Parameters |
|---|---|
| Rated Voltage | 12 kV |
| Maximum System Voltage | 17.5 kV |
| Rated Frequency | 50 Hz |
| Rated Current | 630 A (standard); 1250 A (optional) |
| Rated Short-Time Withstand Current (3s) | 20 kA / 25 kA |
| Rated Peak Withstand Current | 50 kA / 63 kA |
| Rated Short-Circuit Breaking Current | Circuit breaker unit: 20 kA / 25 kA |
| Rated Transfer Current of Load Break Switch | 1250 A |
| Transformer Protection Capacity of Fuse-Switch Combination | ≤ 1600 kVA |
| Insulation Medium | SF₆ gas / dry air (eco-friendly) / solid insulation |
| SF₆ Gas Pressure | 0.04–0.06 MPa at 20°C |
| Degree of Protection | Enclosure: IP44 / IP54; Internal switching unit: IP67 |
| Ambient Temperature | -30°C to +40°C |
| Altitude | ≤ 1000 m (up to 3000 m for high-altitude type) |
| Power Frequency Withstand Voltage (Phase-to-Phase / Phase-to-Earth) | 42 kV / 1 min |
| Lightning Impulse Withstand Voltage (Peak) | 95 kV |
| Mechanical Life | Load break switch: ≥ 5,000 operations; Circuit breaker: ≥ 10,000 operations |
| Cable Entry / Exit | Bottom entry & bottom exit / side entry & side exit, cable-type connection |
| Control Mode | Local manual operation, motorized operation, integrated intelligent control |
| Communication Interface | RS485, Ethernet, supports IEC 60870-5-101 / 104 protocols |
| Enclosure Material | Powder-coated cold-rolled steel / 304 stainless steel |
| Network Configuration | Single ring network, double ring network, open-ring operation, radial power supply |
Overall and mounting dimensions(mm)（Reference）
Custom Outdoor Ring Main Unit (RMU) Solutions for Your Project
(The values can be customized according to local project requirements.)
If you have specific requirements for the parameters, structure, or configuration of the outdoor ring main unit (RMU), please contact us. Our team of account managers, technical engineers, and product consultants will assess your medium‑voltage distribution needs, rated electrical parameters, installation environment, protection and control requirements, and project timeline to provide a tailored solution that precisely matches your application scenario.
We can customize the rated voltage levels, rated current capacity, insulation technology (such as SF₆ gas insulation or solid dielectric), switchgear configuration (including load break switches, circuit breakers, and fuse combinations), compartment layout, enclosure protection grade (e.g., IP65 weatherproof rating), intelligent monitoring and communication systems, and other key design details to ensure reliable performance in outdoor distribution networks. The outdoor RMU is a compact, fully enclosed medium‑voltage switchgear unit designed to withstand harsh environmental conditions while providing dependable switching, protection, and control functions in ring‑type power distribution systems.
Outdoor RMUs are widely applied in urban power grids, suburban distribution networks, industrial parks, renewable energy facilities (such as wind and solar plants), utility substations, and other outdoor electrical infrastructure projects where durability, weather resistance, and operational reliability are essential. Their modular design and robust enclosure allow for flexible configurations and easy maintenance, enabling efficient power distribution and improved system reliability — even in challenging environments.
FAQ
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