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Ring Main Unit
Our Ring Main Unit (RMU) series is designed for both indoor and outdoor installations, delivering reliable performance even in the harshest environmental conditions. We offer air-insulated, oil-insulated, gas-insulated, and SF₆-free RMU solutions, all developed through continuous innovation and advanced technology. Each unit undergoes rigorous testing to meet the highest safety standards.
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Reliable Secondary Switchgear Solutions
Ring main units (RNBs) are compact, fully enclosed, factory-prefabricated cabinets designed for medium-voltage (MV) power distribution. These switchgear are easy to replace, require minimal maintenance, and provide a high level of protection. To meet diverse needs, RNBs are available in a variety of voltage options, making them suitable for both indoor and outdoor applications. Our product portfolio includes air-insulated, gas-insulated, and oil-insulated RNBs, all compliant with international power distribution standards. Our latest air-insulated models use synthetic air, eliminating the need for sulfur hexafluoride (SF₆), offering a range of specifications to address specific requirements.
Our RNBs are specifically developed for medium-voltage power distribution networks, suitable for both indoor and outdoor installations, and operate stably even in the most demanding environments. They offer significant environmental benefits without compromising functionality. Whether you are upgrading existing infrastructure or deploying new secondary switchgear, TOONICE’s RNBs ensure efficient, sustainable, and future-proof power distribution.
Solid Insulated Switchgear
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.
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Why Choose TOONICE’s Ring Main Unit?
Reliable Performance 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?
SF₆is 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
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