Jiangsu Changyun Intelligent Technology Co., Ltd
| Model Number | GXGND-12 |
| Brand Name | ChangYun |
| Certification | ISO9001 |
| Place of Origin | CHINA |
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Product Specification
| Model Number | GXGND-12 | Brand Name | ChangYun |
| Certification | ISO9001 | Place of Origin | CHINA |
The GXGND-12 12kV SF₆ Smart Grid 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, 24kV 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:
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 smart grid 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:
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:
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.
A Smart Grid Ring Main Unit (RMU) is an intelligent medium-voltage switchgear equipped with automation and communication functions. It enables remote monitoring, remote switching, fault detection, and seamless integration with modern power distribution systems.
A Smart Grid RMU improves power reliability, reduces outage time, supports remote operation, and enhances the efficiency of distribution automation. It is widely used in utility networks, renewable energy projects, industrial facilities, and urban power distribution.
Yes. Our Smart Ring Main Unit can support SCADA integration, IEC 61850, and Modbus communication protocols, enabling real-time monitoring, remote control, and intelligent distribution management.
Yes. The RMU can be equipped with a motorized operating mechanism and remote terminal unit (RTU), allowing operators to remotely open and close switches through the SCADA system.
Our Smart RMU supports communication protocols including IEC 61850, Modbus RTU/TCP, and other protocols according to project requirements.
Smart Grid Ring Main Units are suitable for:
Yes. The RMU is designed for distribution automation and can integrate with intelligent monitoring systems to improve network reliability and reduce maintenance costs.
Our Smart Ring Main Units are available in 12kV and 24kV configurations with customized solutions for different power distribution applications.
Yes. Our Ring Main Units are designed and tested in accordance with IEC 62271 standards to ensure safety, reliability, and long-term performance.
Yes. We provide OEM and ODM services, including customized configurations, communication modules, protection schemes, and private labeling to meet different project requirements.
Company Details
Business Type:
Manufacturer,Exporter,Seller
Year Established:
2008
Total Annual:
29460000-44190000
Employee Number:
120~130
Ecer Certification：
Verified Supplier
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