| Brand | ROCKWILL |
| Model NO. | Sealed Air-Insulated Switchgear / RMU for urban substations -12kV |
| Rated voltage | 12kV |
| Rated frequency | 50/60Hz |
| Series | XGN |
The XGN-12/630-20/25 Three-Circuit Normal Pressure Sealed Air-Insulated Switchgear / Ring Main Unit is a medium-voltage power distribution solution engineered to support three independent power supply loops. Operating at a rated voltage of 12kV, it features a normal-pressure sealed enclosure using air as the primary insulating medium, eliminating SF₆ gas or pressurized systems.
This switchgear integrates switching, protection, and control functions for applications requiring robust multi-loop distribution, such as industrial complexes, urban substations, commercial hubs, and critical infrastructure with redundant power requirements.
Three-Circuit Configuration: Supports three separate power loops, enabling flexible distribution, seamless load switching, and enhanced redundancy. Mininmizes downtime by ensuring continuity even if one loop requires maintenance.
SF₆-Free Air Insulation: Operates at atmospheric pressure with air as the insulating medium, eliminating gas leakage risks, environmental pollution, and refilling costs. Aligns with eco-friendly standards.
Sealed Enclosure: Hermetically sealed structure protects against moisture, dust, corrosive substances, and external debris, ensuring stable performance in harsh environments.
Compact and Space-Efficient: Optimized modular design reduces footprint versus traditional multi-circuit switchgears, suitable for space-constrained urban substations and indoor distribution rooms.
High Safety and Reliability: Mechanical interlocks, anti-misoperation mechanisms, and visible isolation points prevent accidental contact. Enclosed design mitigates arc flash risks.
Low Maintenance: Simplified mechanical components with long service life (up to 10000 operations) and no gas monitoring needed, reducing lifecycle costs.
Smart Grid Compatible: Supports remote monitoring and control. Modular structure allows easy installation and future expansion.
| Item | Unit | Value | |
|---|---|---|---|
| Rated Voltage (Ur) |
kV | 12 | |
| Rated Frequency (fr) |
Hz | 50/60 | |
| Rated Current (Ir) |
A | 630 | |
| Power-frequency Withstand Voltage (Ud) | To earth & between phases | kV | 28 |
| Across isolating distance | kV | 32 | |
| Lightning Impulse Withstand Voltage (Up) | To earth & between phases | kV | 75 |
| Across isolating distance | kV | 85 | |
| Rated Short-time Withstand Current (Ik) |
kA | 20/25 | |
| Rated Short-circuit Duration (tk) |
s | 4 | |
| Rated Peak Withstand Current (Ip) |
kA | 50/63 | |
| Rated Short-circuit Breaking Current (Isc) |
kA | 20/25 | |
| Rated Short-circuit Making Current (Ima) — Vacuum Interrupter |
kA | 50/63 | |
| Auxiliary and Control Circuit Rated Voltage (Ua) |
V DC/AC | ≤400 | |
| Auxiliary Circuit Power-frequency Withstand Voltage (1 min) |
V | 2000 | |
| Mechanical Life | Circuit Breaker | Times | 10000 |
| Disconnecting Switch | Times | 3000 | |
| Earthing Switch | Times | 3000 | |
| Electrical Life | Circuit Breaker | Class | E2 |
| Earthing Switch | Class | E2 | |
| Protection Grade of Cabinet Enclosure | IP4X | ||
| Protection Grade of Sealed Box | IP65 | ||
Ambient Temperature: -5°C to +40°C (IEC indoor; -25°C to +45°C available as customized)
Altitude: ≤ 1000m (Ka derating for higher altitudes)
Relative Humidity: Daily average ≤ 95%, Monthly average ≤ 90%
Installation: Indoor, free from corrosive or flammable gas, steam, and excessive dust
Seismic Resistance: ≤ Magnitude 8
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