Product Overview: What Is the XGN15 Air Insulated RMU?
XGN15-12/24/36 Air Insulated RMU (Fixed Type), used in rated voltage 12/24/36kV, rated current 630A and below the ring power supply or radiation power supply system, especially suitable for pre-installed substation as a power system control and protection. This product is equipped with FLN36-12D type sulfur hexafl uoride load switch or FLRN36-12D type load switch and disintegrator combination electrical appliances, with small size, light weight, easy operation, light operation force, reliable interlock, maintenance-free and other characteristics, is a new generation of high voltage switchgear required for urban power grid transformation and construction.
This product complies with: GB3906 “3~35kV AC metal enclosed Switchgear”, GB/T11022 “High voltage switchgear and control equipment standard common technical requirements”, IEC298 “rated voltage above 1kV 50kV and below AC metal enclosed switchgear and control equipment”, DI/T404 “Indoor AC high voltage switch cabinet ordering technical specifi cations” standard.
Model Meaning
| X | G | N | 15 | – | 12/24/36 | (F.R) |
| ↓ | ↓ | ↓ | ↓ | | | |
| Box type | Stationary | Indoor | Design sequence number | | Rated voltage | Load switch-breaker combination appliance |
Installation & Normal Service Conditions
1 Ambient air temperature: -15℃ ~+40℃ ;
2 Altitude: 1000m and below;
3 Humidity conditions:The daily average value is not more than 95%, and the daily average water vapor pressure is not more than 2.2kPa; The monthly average value is not more than 90, and the monthly average water vapor pressure is not more than 1.8kPA.
4 Earthquake intensity: not more than 8 degrees;
5 There is no obvious pollution such as turbid or combustible gas.
Note: When the above normal conditions of use are exceeded, the user can negotiate with the company.
XGN15-12/24/36 Air Insulated RMU (Fixed Type)
| Sr.No. | Description | Unit | Value |
| 1 | Rated voltage(Ur) | kV | 12 | 24 | 36 |
| 2 | Rated current(Ir) | A | 630 | 630 | 630 |
| 3 | Rated frequency(fr) | Hz | 50 | 50 | 50 |
| 4 | Rated short-time power-frequency withstand voltage/1min
(phase-to-phase &to-earth/across the isolating distance) | kV | 28/32 | 50/60 | 70/80 |
| 5 | Rated lightning impulse withstand voltage
(phase-to-phase &to-earth/across the isolating distance) | kV | 75/85 | 125/145 | 170/195 |
| 6 | Rated short-time withstand current | kA/s | 45741 | 45736 | 45673 |
| 7 | Rated peak withstand current | kA | 62.5 | 50 | 40 |
| 8 | Rated short-circuit making current | kA | 62.5 | 50 | 40 |
| 9 | Rated transfer breaking current | A | 1700 | 1400 | 630 |
| 10 | Rated closed-loop breaking current | A | 630 | 630 | 630 |
| 11 | Maximum rated current of the fuse | A | 200 | 200 | 63 |
| 12 | Main switch Mechanical endurance | ops | M2(5000) | M2(5000) | M1(1000) |
| 13 | Earthing switch | ops | M1(2000) | M1(2000) | MO(1000) |
| 14 | Electrical endurance | 1 | Class E3 | Class E3 | Class E3 |
| 15 | IAC class | 1 | A-FLR
20kA/1s
25kA/1s | A-FLR
16kA/1s
20kA/1s | A-FLR
16kAV1s |
| 16 | Degree of protection | 1 | IP4X | P4X | IP4X |
FAQs
What is the XGN15 air insulated ring main unit and what is it used for?
The XGN15-12/24/36 is a fixed-type indoor air insulated ring main unit (RMU) designed for rated voltages of 12kV, 24kV, and 36kV, with rated current up to 630A. It is primarily used in ring power supply networks and radial distribution systems for power control and protection. The XGN15 is especially suitable as the high-voltage switching unit inside compact prefabricated substations, making it a standard choice for urban power grid upgrades, residential developments, and industrial distribution networks. For a broader comparison of available RMU types, see our guide on different types of ring main units.
What load switch types are available for the XGN15 RMU?
The XGN15 can be configured with two types of load switches: the FLN36-12D SF6 gas-insulated load switch or the FLRN36-12D load switch and fuse combination unit. Both options offer maintenance-free operation, light operating force, and reliable interlocking. The SF6 load switch is particularly suited to applications requiring long mechanical endurance (up to 5,000 operations at 12kV and 24kV), while the fuse combination unit provides integrated overcurrent protection for transformer feeder circuits. Please specify your preferred switching configuration when submitting your inquiry.
What are the compliance standards for the XGN15-12/24/36 RMU?
The XGN15 ring main unit complies with four key standards: GB3906 (3~35kV AC metal-enclosed switchgear), GB/T11022 (common technical requirements for high-voltage switchgear and control equipment), IEC298 (AC metal-enclosed switchgear for rated voltages above 1kV up to 52kV), and DL/T404 (indoor AC high-voltage switchgear ordering technical specifications). These certifications ensure the product meets both domestic and international procurement and engineering approval requirements. Certified test documentation is available on request.
What are the installation environment requirements for the XGN15 RMU?
The XGN15 is designed for indoor installation in environments meeting the following conditions: ambient temperature between −15°C and +40°C; altitude not exceeding 1000m; relative humidity with daily average not exceeding 95% and monthly average not exceeding 90%; seismic intensity not exceeding Grade 8; and no significant pollution from dust, combustible gases, or corrosive substances. For installations that fall outside these standard conditions — such as high-altitude sites or corrosive industrial environments — please contact our engineering team to discuss customized configurations.
Can the XGN15 RMU be integrated with a prefabricated substation system?
Yes. The XGN15 air insulated RMU is specifically designed to serve as the high-voltage switching and protection unit within compact prefabricated substations (such as the ZBW-12/0.4 European-type outdoor substation). In this configuration, the XGN15 handles ring network switching, fault isolation, and load control on the HV side, while the transformer and low-voltage distribution panel are integrated in the same enclosure. This all-in-one approach reduces installation footprint, simplifies civil works, and speeds up project commissioning. Our technical team can assist with full substation system design from HV ring main unit selection through to LV distribution panel specification.
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