Email:info@weisho.com
Ring Main Unit manufacturer
WEISHO, as a Ring Main Unit manufacturer of Ring Main Unit in the market, not only creates high-quality products with strict processes, but also provides the most competitive prices with its complete supply chain advantages. At the same time, we support OEM manufacturing and personalized customization services to help customers enhance their brand competitiveness and market value.
What are our characteristics
Production technology
Adopting industry-leading manufacturing processes, continuously optimizing production processes, and improving efficiency and accuracy
Customization and OEM/ODM
Supports OEM/ODM services and can provide customized solutions according to your needs, including rated current, brand identification, etc
High performance-price ratio
Efficient production and strong supply chain management ensure high quality and low prices, reducing customer procurement costs
Long term partnership
Putting customers at the center, establishing long-term stable cooperation, and assisting in the growth of customer business.
Customizable Ring Main Unit
Explore our comprehensive range of customized Ring Main Units designed for reliable medium-voltage distribution networks. Our RMU solutions cover applications from standard load switching and feeder protection to advanced automation and intelligent monitoring, ensuring safety, continuity, and flexibility for modern power systems.
SRM6-12 Gas Insulated Ring Main Unit
XGN15-12 SF6 Gas Insulated Ring Main Unit
HCM-12 Gas Insulated Metal Enclosed Ring Main Unit
HGGN-12 Medium Voltage Ring Main Unit
A brief introduction
WHY CHOOSE US
- Industry-leading testing: Every Ring Main Unit undergoes strict routine, type, and dielectric testing to ensure full compliance with international MV distribution standards.
- High-quality materials: Premium vacuum interrupters, epoxy insulation, and stainless-steel enclosures ensure long service life, stable operation, and excellent environmental resistance.
- Engineering innovation: Our R&D team continuously upgrades RMU technology—including automation, fault indication, and remote SCADA integration—to enhance grid reliability.
- Global certification: Our RMU product line complies with IEC 62271-200/202 and has obtained CE and other regional safety certifications.
- Comprehensive support: From technical selection and system design to installation guidance and after-sales service, we provide complete MV distribution solutions.
Why choose an Ring Main Unit?
Ring Main Units (RMUs) are essential components in modern electrical systems, providing overload and short-circuit protection. They aim to provide reliable performance in various applications, ensuring safety and efficiency. Here’s why ACB is the wise choice to meet your electrical needs.
Efficient Overload Protection
RMUs provide reliable load switching and fault isolation, ensuring stable operation of medium-voltage distribution networks and preventing equipment damage during abnormal conditions.
- Reliable load switching performance
- Fast fault isolation for improved network continuity
- Flexible configuration options for various MV applications
Advanced security features
The Ring Main Unit is equipped with advanced safety features that enhance network protection, prevent electrical faults, and ensure reliable operation of medium-voltage systems.
- Integrated protection devices (fuse or relay options)
- Enhanced isolation and visible break points
- Safe and sealed insulation system (SF₆ or solid insulated)
Versatile Applications
Ring Main Units can be used in various environments and applications, making them a flexible choice for many electrical systems.
- Home usage
- Commercial installation
- Industrial setups
Cost-Effective Solution
Investing in Ring Main Units can save a lot of maintenance and replacement costs because they have a longer lifespan.
- Durable structure
- Reduce maintenance costs
- long service life
The Advantages of Our Ring Main Unit (RMU)
High Arc Withstanding & Fast Fault Clearing
Advanced arc quenching design ensures rapid fault isolation and effective arc control, greatly reducing arc energy and enhancing safety in medium voltage distribution networks.
Intelligent Monitoring & Smart Control
Fully compatible with intelligent monitoring systems, supporting remote operation, real-time status monitoring, fault diagnosis, and early warning to improve power system efficiency and reliability.
Long Mechanical & Electrical Lifespan
Using high-quality insulation materials and optimized mechanical structure, the mechanical life exceeds 10,000 operations, with excellent long-term stability for continuous operation.
Low maintenance cost
Fully sealed structure with SF6 gas or solid insulation, no oil maintenance required. Compact design reduces failure rate, minimizes routine maintenance, and lowers total operating costs.
High Breaking Capacity & Strong Protection
Short-circuit breaking capacity up to 20–25kA, suitable for medium voltage distribution systems up to 24kV, ensuring reliable protection under extreme fault conditions.
Global Certifications & Trusted Brand
Certified by IEC, ISO, and other international standards, widely used in power utilities, industrial plants, renewable energy projects, and urban distribution networks with reliable after-sales support.
Get Your Customized Quotation!
We provide customized solutions. Tell us your needs for a precise quote.
Not just an Ring Main Unit manufacturer
We not only produce Ring Main Units (RMUs), but also offer a range of customized value-added services to meet your project needs. We are committed to pursuing excellence, ensuring that every customer receives personalized attention, expert guidance, and seamless support throughout the entire process of working with us.
Service Consultation
Whether your RMU requirements are basic applications or complex projects, our team can provide professional advice and technical consultation. For high difficulty projects, we provide in-depth engineering support to ensure the selection of the best products and application solutions for you
Product Recommendations
Not sure which RMU is suitable for your system? Our experts will provide free customized advice based on your specific operational and environmental requirements, ensuring that you receive the product that best meets your electrical protection needs.
Service Consultation
If you lack a reliable freight forwarder, we can arrange transportation from the factory to the project site at no additional cost. Our logistics team ensures timely and safe delivery, ensuring that your project proceeds as planned and minimizing downtime and delays.
Installation Support
Need help with installation? Our technical team is always ready to answer your questions and offer hands-on support. For large-scale projects, we can even send engineers on-site to provide professional assistance.
What are our clients saying
Don’t just believe what we say! Take a look at the satisfied customers’ evaluations of air circuit breakers.
“Ring Main Units have significantly improved the safety of our electrical installations.,,
John Doe
Electrical Engineer
“The features of RMUs are revolutionary. They are easy to work with and very efficient.,,
Tom Johnson
Homeowner
“We trust Ring Main Units for their durability and peace of mind.,,
James Brown
DIY Enthusiast
“We switched to RMUs, and the reliability has been outstanding. Maintenance costs are down!,,
Maria Smith
Facilities Manager
WEISHO employs the most advanced production equipment and precise testing methods at all times, providing a solid guarantee for the company’s product manufacturing and quality inspection.
All products of the entire series have undergone strict environmental and electrical tests.
At the same time, the company has obtained ISO9001 quality management system and ISO14001 environmental management system certifications.
♥Wide selection
♥OEM Quality
♥100% Satisfaction Guarantee
Looking forward to working with you
Your trusted electrical equipment supplier
FAQ
Learn more about Air Circuit Breakers through these frequently asked questions.
What is a Ring Main Unit (RMU)?
A Ring Main Unit (RMU) is a compact, fully enclosed medium voltage switchgear used for power distribution networks. It integrates load break switches, circuit breakers, and protection devices to ensure safe, reliable, and flexible power supply.
How do Ring Main Units work?
RMUs control, protect, and isolate electrical circuits by using load break switches and circuit breakers. In case of faults, the RMU can quickly disconnect the faulty section while keeping the rest of the network energized.
Why use Ring Main Units?
RMUs offer high reliability, compact design, enhanced safety, and easy maintenance. They are widely used in urban distribution networks, industrial plants, substations, renewable energy systems, and commercial buildings.
What are the main components of an RMU?
An RMU typically includes:
Load break switches
Circuit breakers
Earthing switches
Protection relays
Current & voltage transformers
Insulated busbars and sealed gas or solid insulation system
How often should RMUs be inspected or tested?
Routine visual inspection is recommended once a year. Detailed electrical testing and functional verification are usually carried out every 3–5 years, depending on operating environment and utility standards.
Can Ring Main Units be used in residential applications?
Yes. RMUs are commonly used in residential power distribution systems for apartment complexes, communities, and smart cities where medium voltage distribution and high reliability are required.
What maintenance do RMUs require?
RMUs feature fully sealed and maintenance-free designs (SF₆ gas or solid insulation). Only periodic inspection and basic functional testing are required, significantly reducing maintenance workload and operating costs.
Are Ring Main Units environmentally friendly?
Modern RMUs use eco-friendly gas alternatives or solid insulation technology. Low gas leakage rates, energy efficiency, and long service life make them an environmentally responsible solution.
What voltage and current ratings do RMUs come in?
RMUs are typically available in voltage ratings of 12kV, 24kV, and 36kV, with current ratings commonly ranging from 630A to 1250A, meeting most medium voltage distribution needs.
Do Ring Main Units come with a warranty?
Yes. Most RMUs are supplied with a standard 1–2 year warranty, with extended warranty options available depending on project requirements and service agreements.
