| Brand | ROCKWILL |
| Model NO. | SF6 insulated switchgear/ring main unit for power distribution-12kV |
| Rated voltage | 12kV |
| Rated frequency | 50/60Hz |
| Series | RMU |
SF6 insulated ring main unit is compact, high-performance equipment for medium-voltage power distribution networks. It uses SF6 gas insulation for reliable operation in 12kV systems, serving as a critical component for controlling, protecting, and distributing power in urban grids, industrial parks, and commercial complexes.
Fully insulated and fully sealed design; enclosure IP67
Environmentally friendly materials-most are recyclable after decommissioning
Complete enclosure grounding with mechanical safety interlocks
Maintenance-free: high-voltage parts sealed in SF6 gas enclosure
Ergonomically designed operating mechanism with low operating force
Flexible expansion for wide application
| Rated voltage | 12kV |
| Rated current | 630A |
| Rated short-time withstand current | 20kA，4s |
| Rated peak withstand current | 50kA |
| 1min power frequency withstand voltage | 28kV |
| Lightning impulse withstand voltage | 75kV |
| Protection level | IP67 |
Suitable altitude: ≤2000m
Temperature: -40℃ ~ +55℃
Humidity: daily mean ≤95%, monthly mean ≤90%
Seismic withstand: ≤ Level 8
Yes. The product features a fully insulated and fully sealed design with the high-voltage parts sealed inside the SF₆ gas enclosure. This ensures a maintenance-free lifecycle — no gas replenishment or internal inspection required under normal operating conditions.
The enclosure achieves IP67 protection rating, providing complete dust-proof and water-proof sealing. This ensures reliable operation in harsh environments including high humidity, dust, and corrosion conditions.
The RMU features complete enclosure grounding with mechanical safety interlocks. These interlocks prevent misoperation and ensure operator safety by blocking access when the grounding switch is in the closed position.
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