| Brand | ROCKWILL |
| Series | RMR |
| Rated voltage | 33/35/40.5kV |
| Power frequency withstand voltage | 70/80/95kV |
| lighting impulse withstand voltage | 170/185/250kV |
| Rated Frequency | 50/60Hz |
G3 (Green Gas for Grid) is a sustainable alternative to SF6, consisting of a fluoronitrile-based gas mixture (e.g., 3M™ Novec™ 4710) blended with CO₂. It provides equivalent insulation and arc-quenching performance while reducing the global warming potential by more than 99% compared to SF6. RMR-33...35...40.5 is a medium voltage ring main unit insulated with G3 gas (a sustainable alternative to SF6).
It has the advantages of compact structure, fully enclosed, fully insulated, long service life, maintenance free, small indoor space occupation, reliability, and low environmental impact.
It is suitable for various occasions and meets the needs of different users. Very suitable for industries such as small and medium-sized secondary substations, switching stations, factories and mines, airports, railway lines, residential areas, multistory buildings, highways, subway stations, tunnel construction, etc.
Eco-friendly G3 Insulation：99% lower GWP than SF₆, same insulation & arc-quenching performance. Meets CIGRE and ISO 14001 standards.
Maintenance-free & Durable：IP67 gas/fuse compartments, annual leakage rate ＜0.1%. 3mm stainless steel chamber for harsh conditions.
Compact Structure：Space-saving design with IP4X enclosure, ideal for substations, buildings and tunnels.
Reliable Performance：Covers 33kV/35kV/40.5kV. Strong current withstand capacity, quick fault response.
Customizable：Modular design, various configurations. Custom production and one-stop solutions available.
| Rated voltage(kV) | 33/35/40.5 |
| Insulation level | |
| Short-duration power frequency withstand voltage 50 Hz 1min(kV rms) | 70/80/95 |
| Rated lightning impulse withstand voltage 1.2/50µs (kV peak) | 170/185/250 |
| Switch | |
| Rated current(A)⁽¹⁾ | 630/1250 |
| Normal load current | 630 |
| earth fault current | 120 |
| cable charging current | 50 |
| Short time withstand current(kA, rms/s)⁽²⁾ | 20/4 or 25/3 |
| Closing current of load switch and earth switch(kA peak) | 50/63 |
| Transformer circuit | |
| Rated current(A) | 200 |
| Breaking current of no-load transformer(A) | 16 |
| Fuse switch (F function) | |
| Short circuit breaking current(kA) | 20/3 |
| Closing current(kA peak) | 50/63 |
| Circuit breaker (V function) | |
| Short circuit breaking current(kA) | 20/3 |
| Closing current(kA peak) | 50/63 |
(1) According to IEC standards, this feature is recommended to be effective between -25 and+40 ambient temperatures.
(2) This is the expected value, and the actual current is limited by the fuse.
Anti-misoperation Interlock：Three stable positions and mechanical interlock prevent misoperation.
Reliable Earthing：Earthing switch has short-circuit making capacity; earthing bar meets grid standards.
Integrated Isolation & Breaking：Dual functions of isolation and disconnection.
Safe Operating Mechanism：Electric & manual mechanism with position indicator; earthing operation locked when switch is closed.
Anti-accidental Operation & Padlock：Anti-misoperation handle; padlock available for switches and buttons.
Visual Earthing Indication：Earthing status clearly displayed on front panel.
Internal Arc Resistance：Withstands 1s internal arc, safe pressure relief, compliant with IEC.
Live Indicator：Equipped with IEC-compliant L-6 type live indicator.
Urban Power Grids：Meets high power demand in cities, with quick fault isolation to reduce outage impact. Compact design fits urban substations, ensuring stable performance with G3 insulation.
Industrial Parks & Mines：Handles heavy loads and frequent switching in industrial zones. Sealed, dust/moisture-proof design withstands tough conditions in factories, mines, and manufacturing facilities.
Critical Infrastructure：Ideal for airports, subways, hospitals, and railway lines. Delivers uninterrupted power supply with reliable performance in harsh environments, ensuring safety for essential services.
Renewable Energy Projects：Suitable for remote wind farms and solar plants. Low-maintenance design minimizes upkeep needs for off-grid sites, with efficient power handling for high-energy flow.
Rural Power Grids：Cost-effective solution for rural grid upgrades. Durable performance in harsh rural environments, with low maintenance requirements to reduce long-term operation costs.
Chinese Standards: GB/T 11022, GB/T 3906, GB/T 3804, GB/T 1984, GB 1985
International Standards: IEC 62271-1, IEC 62271-100, IEC 62271-200, IEC 60265-1
Environmental Standards: CIGRE TB 802, ISO 14001 certified production
Factory Inspections: Gas tightness testing, inflation pressure detection, partial discharge testing, voltage withstand testing, and more
Dimension Drawing
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