Zero GWP RMU
Key attributes
| Brand | ROCKWILL |
| Series | RMR，REC |
Description
Zero GWP RMU
Zero GWP switchgear
A ring main unit whose insulation medium has a global warming potential of zero. No SF6, no fluorinated gas — just pure/dry air or solid insulation, paired with vacuum interruption, for 12–24kV distribution.
What does "zero GWP" mean for an RMU?
Global Warming Potential (GWP) measures how much heat a gas traps compared to CO2. SF6 has a GWP of around 23,500 — meaning each kilogram leaked equals thousands of kilograms of CO2. A zero GWP RMU contains no gas with any climate warming potential, so over its entire life there is effectively nothing to leak into the atmosphere.
Pure / dry air insulation
The tank holds conditioned dry air — breathable, harmless, and with a GWP of zero by definition.
Solid insulation option
Epoxy/resin encapsulated live parts carry no gas at all — a GWP-free alternative for compact or harsh sites.
Vacuum interruption
Current breaking is handled by sealed vacuum interrupters — independent of the insulation medium and proven over decades.
Why specify a zero GWP RMU
F-gas compliance
No fluorinated gas means no phase-out exposure, no quarterly gas reporting and no recovery obligation at end of life.
Real ESG / net-zero value
You can truthfully report zero CO2-equivalent leakage from the switchgear — not just a lower number, but zero.
Safe on site
Air does not displace oxygen. No asphyxiation risk in cable pits, no specialized gas-handling for installers.
Lower long-term cost
No gas-density top-ups, no gas recovery disposal fees — just sealed vacuum parts and air-pressure monitoring.
Same performance
12–24kV class, 20kA/3s typical, IEC 62271 tested. Going zero-GWP is not a compromise on ratings.
Tender-ready
Many utility and green-project tenders now require zero-GWP equipment — this RMU meets that criterion directly.
Typical specifications
Representative values of our zero-GWP RMU range. The certified datasheet for your project is prepared on request — contact us.
| Parameter | Typical value |
|---|---|
| Rated voltage | 12kV / 24kV (up to 36kV solid-insulated) |
| Rated frequency | 50 / 60 Hz |
| Insulation medium | Pure/dry air or solid epoxy — GWP 0, SF6-free |
| Arc interruption | Sealed vacuum interrupter |
| Busbar rated current | 630A (up to 1250A on request) |
| Rated short-time withstand | 20kA / 3s (25kA on request) |
| Configuration | 2–4 ring incomers + transformer feeder (switch-fuse / VCB) |
| Standard | IEC 62271-1, -102 / -103 |
| Global warming potential | Zero |
| Monitoring | Air pressure, position; optional SCADA / DA interface |
See also: our pure air insulated RMU and the full SF6-free product range.
Solutions for zero GWP RMU
-
Analysis of Common Problems in 10kV Gas-Insulated Ring Main Units (RMUs)Introduction10kV gas-insulated RMUs are widely used due to their numerous advantages, such as being fully enclosed, possessing high insulation performance, requiring no maintenance, having a compact size, and offering flexible and convenient installation. At this stage, they have gradually become a critical node in urban distribution network ring-main power supply and play a significant role in the power distribution system. Problems within gas-insulated RMUs can severely impact the entire distr
Documentation Resource Library zero GWP RMU
Certifications zero GWP RMU
FAQ for zero GWP RMU
Read our technical guide: Pure air vs SF6 switchgear - IEE-Business
Yes. We manufacture these RMUs for distributors and EPCs under OEM/ODM — see our SF6-free RMU manufacturing service.
Yes. Zero-GWP and SF6-free are exactly the criteria many utility and renewable tenders now require; we supply the test reports and declaration to support your bid.
Conditioned dry air or solid epoxy provides phase-to-earth insulation, and a sealed vacuum interrupter handles current breaking. Together they meet the same IEC 62271 class ratings as SF6 gear.
It is a factual claim about the insulation medium. Because the RMU uses dry air or solid dielectric — not SF6 or any fluorinated gas — there is no gas with a non-zero GWP inside the equipment, so climate-warming leakage from the switchgear is zero.
