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24KV Ring Main Units for MV Electric Distribution | 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:
- ποΈSecondary Distribution Substations in urban and residential areas
- πIndustrial Plants & Manufacturing Facilities
- π’Commercial Complexes, Hospitals, and Data Centers
- π±Renewable Energy Integration (Wind Farms & Solar Parks)
- βοΈInfrastructure Projects (Airports, Railways, Tunnels)
- βοΈMining and Offshore Applications
Types of Ring Main Units We Offer
We provide tailored solutions to meet specific network requirements and environmental preferences.
SF6 Gas
SF6 Gas Insulated RMU: The industry standard for compactness and proven performance, offering excellent dielectric and arc-quenching properties.
Vacuum
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
Solid Insulated RMU (SIR): Uses solid epoxy insulation for enhanced environmental safety and an extremely compact footprint.
2-Way
Compact RMU (2-Way): Standard two-way units for simple T-off points in the ring.
3/4-Way
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:
- β Designed and tested in accordance with IEC, IEEE, and other major international standards.
- πManufactured in state-of-the-art facilities with rigorous Quality Control.
- πBacked by global technical support and service expertise.
Frequently Asked Questions
βWhat is a Ring Main Unit (RMU) and what is it used for?
A Ring Main Unit (RMU) is a compact, factory-assembled set of switchgear used in medium-voltage (MV) power distribution networks. It is primarily used to connect substations in a ring circuit, allowing power to be fed from two directions. This ensures continuity of supply β if one section of the ring fails, power can still be delivered from the other direction, making RMUs essential for reliable urban and industrial power distribution.
βWhat is the difference between SF6, Vacuum, and Solid Insulated RMUs?
SF6 Gas Insulated RMUs use sulfur hexafluoride gas for insulation and arc-quenching β a proven, compact technology. Vacuum Insulated RMUs use vacuum interrupters for switching, often combined with dry air insulation, offering an eco-friendlier alternative. Solid Insulated RMUs (SIR) use solid epoxy resin, eliminating any gas or liquid insulation entirely, making them the most environmentally safe option with an extremely compact design.
βAre your RMUs maintenance-free?
Yes. Our RMUs feature fully sealed designs where all live parts are enclosed in a stainless steel or robust polymer tank. This hermetically sealed construction protects against moisture, dust, salt fog, and other environmental contaminants, making the units virtually maintenance-free over their operational lifetime and significantly reducing total cost of ownership.
βWhat international standards do your RMUs comply with?
Our Ring Main Units are designed and tested in compliance with major international standards including IEC 62271-200 (AC metal-enclosed switchgear), IEC 62271-100 (AC circuit breakers), IEC 62271-103 (switches), and IEEE standards where applicable. All units undergo rigorous type testing and routine factory acceptance testing (FAT) before delivery.
βCan RMUs be used in renewable energy projects such as wind farms or solar parks?
Absolutely. Our RMUs are widely deployed in renewable energy applications, including wind farm collector networks and solar park distribution systems. Their compact and modular design makes them ideal for installation in wind turbine bases or outdoor solar substations, while their sealed construction ensures reliable performance in harsh outdoor environments with minimal maintenance requirements.
βWhat configurations are available and can they be customized?
We offer a full range of configurations from simple 2-way compact units for T-off connections, to fully equipped 3-way and 4-way units with integrated circuit breakers or switch-fuse combinations for feeder protection. Our modular design philosophy allows for customized configurations to meet specific voltage levels, current ratings, protection requirements, and network topologies. Please contact our technical team to discuss your specific project needs.
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