- Telephone: +86-139-8977-9778
- Email: jack@toonice.com
- English
Ring Main Unit
Engineered for dependable fault protection, stable operation, and easy maintenance in industrial, commercial, and utility systems.
Request Quote
Compact, Reliable, and Efficient Ring Main Unit Solutions
Ring main units (RMUs) are compact, fully enclosed, factory-prefabricated switchgear systems designed for medium-voltage power distribution. They are easy to replace, require minimal maintenance, and provide a high level of protection. By allowing multi-directional power flow, they ensure a continuous power supply even during partial grid failures. With integrated switching, protection, and control functions, RMUs enable safe and uninterrupted power distribution.
TOONICE RMUs are available in a range of voltage options for both indoor and outdoor applications. They reduce environmental impact without compromising performance. Whether upgrading existing infrastructure or deploying new secondary switchgear, TOONICE provides efficient, sustainable, and future-ready power distribution solutions.
Our portfolio includes air-insulated, gas-insulated, and oil-insulated RMUs, all compliant with international power distribution standards. The latest air-insulated models use synthetic air, eliminating the need for sulfur hexafluoride (SF₆), and are available in various configurations to meet specific requirements. Advanced engineering and rigorous testing ensure high reliability, low maintenance costs, and long-term operational stability.
Solid Insulated Switchgear
Solid insulated switchgear (SIS) is an advanced medium-voltage solution that uses solid-state insulation instead of gas or oil insulation, enabling safe, environmentally friendly, and maintenance-free operation. Its compact, modular design facilitates easy installation and flexible configuration, providing reliable, efficient, and sustainable power distribution for modern power systems.
Gas Insulated Switchgear
Our gas insulated ring main units are compact, highly reliable, and suitable for locations with limited space or harsh climates. These units are insulated with SF₆gas, providing excellent safety and operational performance.
Air Insulated Switchgear
Our air insulated RMUs are designed to balance high performance and sustainability. These SF₆-free units use synthetic air insulation materials, providing the same robust protection and reliability while delivering significant environmental benefits by eliminating harmful greenhouse gases.
CATALOGUE
Know Our Products
All the information related to our products at your disposal:
Product Portfolio
Why Choose TOONICE’s Ring Main Unit?
Performs reliably in harsh conditions
TOONICE’s ring main unit is suitable for indoor and outdoor use in harsh environments, offering air-insulated, gas-insulated, and compact designs to meet diverse application needs.
Compact & Space-Efficient Designs
Our compact RMUs feature a highly integrated design that’s 30–50% smaller than conventional units, making them ideal for space-constrained installations.
Ease of Installation & Operation
With a factory-assembled, modular design, TOONICE RMUs enable fast installation and commissioning while reducing labor costs, and they are easy to operate and maintain.
Customization & Global Support
TOONICE provides flexible customization, such as voltage ratings, insulation types, and configurations, meeting the exact technical needs of utilities and industrial customers.
FAQs
Why is it called a “ring” main unit?
Because it’s used in a ring (loop) network, where power can flow from two directions. If one side fails, supply continues from the other side, better reliability.
What voltage levels do RMUs operate at?
Typically:
- 6 kV
- 11 kV
- 22 kV
- 33 kV
What is SF₆ in RMUs, and is it safe?
SF₆ is a gas with excellent insulation properties
Safe when sealed, but it’s a greenhouse gas
Many manufacturers now offer SF₆-free RMUs due to environmental regulations
How often do RMUs require maintenance?
Gas-insulated RMUs: Very low (often 10–20 years)
Solid insulated RMUs: Minimal
Routine inspections still recommended per utility standards
Power Distribution Solutions for Your Project
Tell us your requirements and our team will recommend the right product solution for your project.
- Factory Direct Supply
- OEM / ODM Support
- Fast Response
Request A Quote
Tell us your basic requirements, and our team will get back to you with the suitable recommendation.
