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24KV Ring Main Units for MV System Electric Distribution - Reliable Solutions from China Suppliers & Factory
Product Advantages
Our Ring Main Units are designed for maximum safety, reliability, and ease of operation.
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Compact & Modular Design
Saves critical space in tight urban substations, commercial basements, or wind turbine foundations. The modular design allows for flexible configurations and future expansion.
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Advanced Insulation Technology
Available in SF6 Gas Insulated and Environmentally Friendly Dry Air/Vacuum options, offering superior arc-quenching and insulation in a sealed, maintenance-free environment.
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Fully Sealed & Maintenance-Free
The live parts are enclosed in a stainless steel or robust polymer tank, protected from moisture, dust, salt, and other environmental contaminants, drastically reducing maintenance needs.
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Enhanced Safety Features
Earthing Switch and Visible Isolation ensure operator safety during maintenance. Fault indicators and remote monitoring capabilities provide real-time system status.
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Load Breaking & Fault Making Capability
Equipped with advanced vacuum interrupters or SF6 technology for reliable switching of load currents and safe closure onto faults.
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Easy Installation & Integration
Pre-assembled, tested, and ready for connection, reducing on-site labor and commissioning time.
Primary Applications
Our RMUs are versatile and critical for a wide range of distribution scenarios:
- Secondary Distribution Substations in urban and residential areas
- Industrial Plants & Manufacturing Facilities
- Commercial Complexes, Hospitals, and Data Centers
- Renewable Energy Integration (Wind Farms & Solar Parks)
- Infrastructure Projects (Airports, Railways, Tunnels)
- Mining and Offshore Applications
Types of Ring Main Units We Offer
We provide tailored solutions to meet specific network requirements and environmental preferences.
SF6 Gas Insulated RMU
The industry standard for compactness and proven performance, offering excellent dielectric and arc-quenching properties.
Vacuum Insulated RMU
Utilizes vacuum interrupters for load switching, housed in a sealed tank, often with dry air as the main insulation for an eco-friendly profile.
Solid Insulated RMU (SIR)
Uses solid epoxy insulation for enhanced environmental safety and an extremely compact footprint.
Compact RMU (2-Way)
Standard two-way units for simple T-off points in the ring.
Fully Equipped RMU (3-Way or 4-Way)
Include circuit breakers or combined switch-fuse units for comprehensive feeder protection.
Our Quality Commitment
We deliver products you can trust. Our Ring Main Units are:
- Designed and tested in accordance with IEC, IEEE, and other major international standards.
- Manufactured in state-of-the-art facilities with rigorous Quality Control.
- Backed by global technical support and service expertise.
Frequently Asked Questions
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What is a Ring Main Unit (RMU) and what is it used for?
A Ring Main Unit (RMU) is a compact, factory-assembled switchgear unit used in medium-voltage (MV) power distribution networks. It is primarily used to connect a secondary substation to a ring distribution circuit, enabling power to be fed from two directions for improved reliability. RMUs are widely deployed in urban areas, industrial plants, commercial buildings, and renewable energy installations.
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What is the difference between SF6, Vacuum, and Solid Insulated RMUs?
SF6 Gas Insulated RMUs use sulfur hexafluoride gas for arc-quenching and insulation — proven, compact, and highly reliable. Vacuum Insulated RMUs use vacuum interrupters for switching, often combined with dry air insulation for a more eco-friendly solution. Solid Insulated RMUs (SIR) use solid epoxy resin insulation, offering excellent environmental safety and the most compact footprint, with no gas handling required.
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Are your Ring Main Units compliant with international standards?
Yes. All our Ring Main Units are designed, manufactured, and tested in full compliance with major international standards including IEC 62271-200, IEC 62271-100, IEEE standards, and other relevant regional requirements. Our manufacturing facilities operate under strict Quality Control processes to ensure every unit meets the highest performance and safety benchmarks.
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How much maintenance do Ring Main Units require?
Our RMUs are designed to be fully sealed and maintenance-free under normal operating conditions. The live components are enclosed in a hermetically sealed stainless steel or polymer tank, protecting them from moisture, dust, salt fog, and other contaminants. This sealed design eliminates the need for regular internal maintenance, significantly reducing lifecycle costs and operational downtime.
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Can Ring Main Units be used in renewable energy projects?
Absolutely. Our RMUs are widely used in renewable energy applications including wind farms and solar parks. Their compact and robust design makes them ideal for installation in wind turbine foundations and outdoor solar field substations. They facilitate reliable medium-voltage switching and protection for energy collection networks, supporting seamless integration into the main grid.
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What configurations are available and can they be customized?
We offer a comprehensive range of configurations including 2-way compact units for simple ring connections, as well as 3-way and 4-way fully equipped units incorporating circuit breakers or switch-fuse combinations for feeder protection. All units can be tailored to meet specific voltage ratings, current ratings, protection relay requirements, and communication/remote monitoring needs. Our engineering team is available to support custom project specifications.
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