SF6 Gas Fully Insulated Ring Main Unit (RMU)

Industrial zones, coastal regions, and highly humid underground chambers present incredibly hostile environments for traditional, air-insulated electrical switchgear, often causing flashovers, corrosion, and costly downtime. We developed our premium SF6 Gas Fully Insulated Ring Main Unit (RMU) to solve these challenging environmental conditions, completely sealing all primary live parts and switching mechanisms inside a 3.0mm thick, robotically welded 304 stainless steel gas tank filled with SF6 gas. This hermetically sealed design gives our SF6 Gas Fully Insulated Ring Main Unit (RMU) an IP67 protection class, ensuring continuous, safe, and reliable power distribution even in flood-prone underground municipal grids, salt-spray coastal environments, or dusty mining sites.

Featuring a highly compact and modular design, our SF6 Gas Fully Insulated Ring Main Unit (RMU) fits easily into small box-type substations, helping municipal utilities and industrial parks minimize their urban land footprint. We subject every welded gas tank to rigorous helium mass spectrometry leak testing, guaranteeing a leak rate of less than 0.1% per year over a 30-year maintenance-free operational lifespan. As an established, certified supplier to major state power utilities, our RMUs have been successfully deployed in urban smart grids, heavy chemical plants, and high-speed rail networks globally, demonstrating absolute field reliability.

Urban Secondary Distribution Networks: Safe and compact ring main distribution in modern residential and commercial districts.

Coastal & Offshore Facilities: Corrosion-resistant switchgear for sea-breeze ports, offshore wind farm substations, and coastal industries.

Mining & Heavy Chemical Plants: Safe, dust-proof power distribution in explosive, dusty, or chemically corrosive environments.

High-Speed Rail Traction Substations: High-durability switchgear capable of handling frequent switching operations and load fluctuations.

We operate a world-class manufacturing facility covering 25,000 square meters, equipped with high-precision laser cutting machines, robotic welding stations, and specialized cleanroom assembly halls. We offer complete custom configurations for our SF6 Gas Fully Insulated Ring Main Unit (RMU), including standard combinations of Load Break Switch (C) units, Vacuum Circuit Breaker (V) units, Fuse-switch (F) units, and Metering (M) modules. All units are fully certified with third-party Type Test Reports, verifying their performance at high-altitude plateau regions up to 4,000 meters.

 

Packaging: Securely wrapped in thick anti-static film with heavy-duty desiccants, vacuum-sealed inside a moisture-barrier bag, and housed in reinforced, steel-framed seaworthy wooden crates.

 

Shipping: Shipped on heavy-duty steel channel skids, bolted securely to prevent any movement or vibration during long-distance maritime transport.