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Ring Main Unit
SAGE
8537209000
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Our Ring Main Unit (RMU) is a factory‑assembled, metal‑enclosed medium voltage switchgear designed for reliable power distribution in secondary networks. All live parts are housed inside a stainless‑steel tank filled with SF6 gas, providing complete insulation and protection against environmental contaminants such as dust, humidity, and salt spray.
The modular design allows you to combine functional units – switch‑fuse, circuit‑breaker, load‑break, PT, and metering – to match your network topology exactly. With a compact footprint and IP67‑rated tank, this RMU is equally suitable for indoor substations, outdoor kiosks, and underground vaults.
Fully insulated and sealed – SF6 gas insulation ensures stable dielectric performance regardless of ambient conditions.
Maintenance‑free operation – sealed‑for‑life tank eliminates the need for gas refilling or regular servicing.
Modular & flexible – combine up to 6 modules (C, F, V, PT, M, etc.) to suit complex ring‑main or radial networks.
High safety – integrated interlock mechanisms prevent mal‑operation; pressure relief devices protect against internal arc faults.
Compact design – up to 50% space saving compared to traditional air‑insulated switchgear.
Robust construction – stainless steel tank with anti‑corrosion treatment; suitable for harsh environments.
Easy installation – pre‑wired and pre‑tested at factory; quick plug‑in connections for field cables.
Wide current range – up to 630A for load‑break and 200A for fuse‑combination units (or up to 1250A with circuit breaker).
Parameter | Value |
|---|---|
Rated Voltage | 12kV / 24kV / 36kV (specify) |
Rated Frequency | 50/60 Hz |
Rated Current (busbar) | Up to 630A (load switch) / 1250A (CB) |
Rated Short‑time Withstand Current | 20kA / 1s (or 25kA) |
Rated Peak Withstand Current | 50kA / 63kA |
Power Frequency Withstand Voltage | 28kV / 50kV / 70kV (depending on voltage level) |
Lightning Impulse Withstand Voltage | 75kV / 125kV / 170kV |
Internal Arc Classification | IAC AFLR 20kA / 1s |
Enclosure Protection (gas tank) | IP67 |
Enclosure Protection (cable compartments) | IP4X |
SF6 Gas Pressure (20°C) | 0.14 MPa (relative) |
Operating Ambient Temperature | –25°C ~ +55°C |
Relative Humidity | ≤ 95% (non‑condensing) |
Altitude | ≤ 1000m (higher altitude versions available) |
Standards | IEC 62271‑200, IEC 60420, GB/T 11022 |
Our RMU can be assembled with the following module types to meet different system requirements:
C Module – Load‑break switch + earthing switch
F Module – Switch‑fuse combination (load switch + fuse)
V Module – Vacuum circuit breaker + earthing switch
PT Module – Voltage transformer + load switch
M Module – Metering unit (CT / VT)
CB Module – Circuit breaker with protection relay
All modules are fully compatible and can be combined in any sequence.
Urban secondary distribution networks (ring‑main and radial)
Commercial complexes, shopping malls, and high‑rise buildings
Industrial plants, mining sites, and oil & gas facilities
Airports, railway stations, and metro power supply
Wind farms and solar photovoltaic substations
Prefabricated compact substations (pad‑mounted or kiosk)
IEC 62271‑200 – High‑voltage switchgear and controlgear (AC metal‑enclosed)
IEC 60420 – High‑voltage alternating current switch‑fuse combinations
GB/T 11022 – Common specifications for high‑voltage switchgear
Internal arc tested according to IEC 62271‑200 (IAC AFLR)
CE marking available upon request
Our manufacturing facility is ISO 9001 and ISO 14001 certified.
Proven reliability – thousands of units operating worldwide in demanding conditions.
Custom engineering – we tailor solutions to your specific voltage, current, and protection requirements.
Fast delivery – standard configurations in stock; custom orders within 4–6 weeks.
Competitive pricing – factory direct, no hidden costs.
Global support – technical documentation, on‑site commissioning assistance, and after‑sales service.
When placing an order, please specify:
Rated voltage (12kV / 24kV / 36kV)
Rated current (e.g., 630A / 1250A)
Number of modules and their types (e.g., C + F + V)
Cable entry direction (top / bottom / side)
Auxiliary voltage (AC/DC, 110V / 220V)
Any special accessories (e.g., CT, VT, surge arresters, remote control panel)
Example order code:
RMU‑24‑630‑C‑F‑V‑PT
(24kV, 630A busbar, load‑break + fuse‑combination + circuit‑breaker + PT module)
Each RMU is shipped complete with all internal wiring and gas filled. Installation requires only anchoring the enclosure, connecting power cables, and wiring auxiliary signals. Detailed instruction manuals and wiring diagrams are provided. We also offer remote technical support and on‑site supervision at extra cost.
Product Brochure (PDF)
Technical Datasheet (PDF)
Dimensional Drawings (DXF / PDF)
Type Test Reports (IEC)
Operation & Maintenance Manual
(Contact us for download links)
For more information, custom solutions, or to request a quotation, please fill in the inquiry form or email us at [your email]. Our sales engineers will respond within 24 hours.
