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C-GIS RMU-12 SF6 Ring Main Unit (12kV)
C-GIS RMU-12 SF6 ring main unit is a compact gas-insulated switchgear assembly rated at 12kV, designed for secondary distribution networks. This SF6 RMU features a modular architecture with configurations from 2-switch to 4-switch assemblies, incorporating three-position load break switches and optional VCB modules. The sealed SF6 pressure system provides maintenance-free operation with IP65 enclosure protection for indoor, pad-mounted, and underground installations. The modular lineup design with front-accessible controls and metering displays supports easy service access and centralized panel operation, making this RMU suitable for utility networks, residential substations, and renewable energy projects.
- Overview
- Applications
- Technical Data
- Services
- Quality Control
- Recommended Products
Modular cabinet architecture: Repeated panel configurations supporting extensible lineups from 2-switch to 4-switch assemblies with field-expandable capability.
Three-position load break switches: Closed, Open, and Earthed positions within each switch, providing safe isolation and grounding without separate earthing equipment.
Sealed SF6 pressure system: Maintenance-free design with no gas refilling required throughout service life; insulation integrity independent of ambient conditions.
IP65 enclosure protection: Waterproof and dustproof construction suitable for ground-level, pad-mounted, and underground installations.
Front-accessible controls: Visible metering displays, monitoring interfaces, and centralized panel operation for straightforward service access.
Optional VCB module: Integrated vacuum circuit breaker for fault protection, automatic reclosing, and coordination with protection relays.
Flexible cable connection: Bottom cable entry via plug-in elbow connectors (200A, 400A, 630A) or bolted lug termination.
C-GIS RMU-12 SF6 ring main unit is a compact gas-insulated switchgear assembly engineered for 12kV three-phase power systems at 50/60Hz. This RMU is specifically designed for secondary distribution networks, providing load switching, fault isolation, and protection functions within a sealed SF6 environment.
The construction employs a modular cabinet architecture featuring repeated panel configurations that support extensible switchgear lineups. Each module houses switching devices within a hermetically sealed stainless steel tank filled with SF6 insulating gas, ensuring insulation integrity independent of ambient conditions. The modular design supports a range of configurations from basic 2-switch arrangements to comprehensive 4-switch assemblies incorporating integrated vacuum circuit breaker modules for protection duties.
The front-facing design provides centralized panel operation with visible metering displays and monitoring interfaces on each cabinet. The metering display interfaces allow operators to view system parameters and switch status at a glance. The front controls enable direct operation of switching functions, simplifying routine switching procedures and emergency response.
The three-position load break switches offer Closed, Open, and Earthed positions within a single integrated assembly, providing safe circuit isolation and cable grounding without additional earthing equipment. The optional VCB module integrates a vacuum circuit breaker for fault protection and automatic reclosing functions.
The sealed pressure system utilizes SF6 gas as both insulation and arc quenching medium, with a leak rate supporting maintenance-free operation throughout the equipment service life. The IP65 enclosure rating provides protection against dust ingress and water jets. The bottom cable entry arrangement supports plug-in elbow connectors or bolted lug termination, accommodating various cable types and installation requirements.
C-GIS RMU-12 SF6 ring main unit is deployed across a wide range of 12kV secondary distribution applications:
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Utility secondary distribution networks:
In urban and suburban ring network configurations, this SF6 RMU serves as the primary switching and protection assembly for underground cable feeders. The modular architecture supports network expansion as load grows, with additional switch modules integrated into existing lineups without complete replacement. The sealed SF6 design ensures reliable operation in underground vaults and pad-mounted enclosures where moisture ingress is a concern. -
Residential and commercial complex substations:
The RMU-12 provides incoming supply switching, feeder protection, and load management for residential compounds, shopping centers, and office complexes. The front-accessible metering displays enable facility management teams to monitor power consumption and switch status without specialized training, while the IP65 enclosure supports installation in semi-outdoor substation environments. -
Industrial park distribution ring networks:
Industrial estates and manufacturing zones utilize this RMU for ring network switching and fault isolation. The optional VCB module provides protection for industrial feeders serving large motor loads and transformer circuits. The modular lineup design accommodates future expansion as industrial demand increases. -
Renewable energy medium voltage collection:
Solar farms and wind projects deploy the RMU-12 for inverter and turbine feeder aggregation within collection substations. The sealed construction protects internal components from environmental contaminants, making it suitable for installation in renewable energy project environments where outdoor conditions prevail. -
Compact substations and pad-mounted installations:
The RMU-12 is specified for compact secondary substation designs and pad-mounted enclosures in urban areas where space is limited. The front-access design enables installation against walls or in confined spaces without rear access requirements, reducing civil works costs and project timelines. -
Utility distribution automation:
With remote control and status monitoring capability, the RMU supports distribution network automation schemes, enabling rapid fault isolation and service restoration.
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Parameter
|
12kV RMU | 24kV RMU |
|---|---|---|
| Rated Voltage | 12 kV | 24 kV |
| Rated Power-Frequency Withstand | 42 kV (1 min) | 50 kV (1 min) |
| Lightning Impulse Withstand Voltage (BIL) | 75 kV (peak) | 125 kV (peak) |
| Rated Normal Current (LBS) | 630 A | 630 A |
| Rated Short-Circuit Making Current | 40 kA (peak) | 40 kA (peak) |
| Rated Short-Time Withstand Current | 16 kA / 20 kA (1s) | 16 kA (1s) |
| Rated Frequency | 50 / 60 Hz | 50 / 60 Hz |
| SF6 Gas Pressure (Gauge) | 0.04 MPa | 0.04–0.05 MPa |
| Protection Degree | IP65 | IP65 |
| Insulation Medium | SF6 gas (sealed) | SF6 gas (sealed) |
| Number of Switch Units | 2–5 (configurable) | 2–4 (configurable) |
| Enclosure Material | Stainless steel 304 | Stainless steel 304 |
| Ambient Temperature | -25°C to +55°C | -25°C to +55°C |
| Altitude | ≤ 1000 m | ≤ 1000 m |
| Cable Connection | 200 / 400 / 630A elbow or lug | 400 / 630A elbow or lug |
| Overall Dimensions (W×D×H) | ≈ 900×600×1100 mm | ≈ 1100×700×1300 mm |
| Compliance Standard | IEC 62271-103, IEC 62271-200 | IEC 62271-103 |
Our Services-Services That Support Your Power Distribution Projects
- 1-Product Selection Support
We help customers choose the right MV and LV switchgear products based on voltage, application, and project requirements. - 2-Technical Parameter Confirmation
We support technical checking for cabinet type, rated voltage, current, breaker type, and system configuration. - 3-Project Solution Matching
We provide suitable power distribution product combinations for substations, factories, buildings, and infrastructure projects. - 4-OEM & Customized Support
We support customized cabinet structure, components, labels, packaging, and project-based requirements. - 5-Export Documentation Support
We provide product documents, packing information, commercial documents, and export-related support. - 6-After-Sales Communication
We offer responsive communication for installation questions, product details, and project follow-up.
Reliable Quality for Every Power Distribution Project
Moldvolt focuses on stable product quality from material selection to final delivery. Each switchgear product is checked according to project requirements, technical parameters, and export standards to ensure safe and reliable performance.
Key Quality Control Points
- Component Inspection – Key electrical components are checked before assembly.
- Cabinet Structure Check – Cabinet size, structure, wiring layout, and installation details are reviewed.
- Electrical Parameter Confirmation – Rated voltage, rated current, breaker type, and configuration are verified.
- Functional Testing – Products are tested for operation, protection, and basic electrical performance.
- Appearance & Packaging Check – Surface finish, labels, accessories, and packaging are inspected before shipment.
- Delivery Documentation – Technical documents, packing details, and export information are prepared for delivery.
