| Brand | ROCKWILL |
| Series | RMR，REC |
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.
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.
The tank holds conditioned dry air — breathable, harmless, and with a GWP of zero by definition.
Epoxy/resin encapsulated live parts carry no gas at all — a GWP-free alternative for compact or harsh sites.
Current breaking is handled by sealed vacuum interrupters — independent of the insulation medium and proven over decades.
No fluorinated gas means no phase-out exposure, no quarterly gas reporting and no recovery obligation at end of life.
You can truthfully report zero CO2-equivalent leakage from the switchgear — not just a lower number, but zero.
Air does not displace oxygen. No asphyxiation risk in cable pits, no specialized gas-handling for installers.
No gas-density top-ups, no gas recovery disposal fees — just sealed vacuum parts and air-pressure monitoring.
12–24kV class, 20kA/3s typical, IEC 62271 tested. Going zero-GWP is not a compromise on ratings.
Many utility and green-project tenders now require zero-GWP equipment — this RMU meets that criterion directly.
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.
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.
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.
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.
Yes. We manufacture these RMUs for distributors and EPCs under OEM/ODM — see our SF6-free RMU manufacturing service.
Read our technical guide: Pure air vs SF6 switchgear - IEE-Business
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