| Brand | ROCKWILL |
| Model NO. | Extendable Indoor Ring Main Unit for distribution network-12kV to 36kV |
| Rated voltage | 36kV |
| Rated frequency | 50/60Hz |
| Series | RMR |
The Ring Main Unit (RMU) uses an SF6 load break switch as the main switch. The entire cabinet is suitable for power distribution automation and features a compact, expandable metal-enclosed design.
It offers a simple structure, flexible operation, reliable interlocking, and convenient installation. The VCB series with permanent magnet mechanism can also be assembled with RCB to meet diverse distribution requirements.
| No | Item | Unit | 12 kV | 24 kV | 36 kV |
|---|---|---|---|---|---|
| 1 | Rated voltage | kV | 12 | 24 | 36 |
| 2 | Rated frequency | Hz | 50 / 60 | 50 / 60 | 50 / 60 |
| 3 | Rated current | A | 630 / 1250 | 630 / 1250 | 630 |
| 4 | 1 min power frequency withstand voltage (Phase-to-earth / Across open contacts) | kV | 28 / 32 | 50 / 60 | 70 / 80 |
| 5 | Lightning impulse withstand voltage, BIL (Phase-to-earth / Across open contacts) | kV | 75 / 85 | 125 / 145 | 170 / 195 |
| 6 | Rated short-circuit breaking current (RMS) | kA | 31.5 | 25 | 16 |
| 7 | Rated mainly active load breaking current | A | 630 | 630 | 630 |
| 8 | Rated closed-loop breaking current | A | 630 | 630 | 630 |
| 9 | Rated transfer current [For LBS-Fuse combination] | A | 1700 | 1000 | 800 |
| 10 | Rated short-time withstand current (RMS, 2s / 3s) | kA | 31.5 | 25 | 16 |
| 11 | Rated short-circuit making current (peak) | kA | 80 | 63 | 40 |
| 12 | Rated peak withstand current (peak) | kA | 80 | 63 | 40 |
| 13 | Rated cable-charging breaking current | A | 25 / 50 | 25 / 50 | 25 / 50 |
| 14 | Cable-charging breaking current under earth fault | A | 20 | 20 | 16 |
| 15 | Mechanical endurance | Times | 5000 | 5000 | 5000 |
Widely used in distribution automation systems, industrial parks, residential complexes, commercial centers, high-rise buildings, railway stations, airports, and mines. It divides load current, interrupts short-circuit current, controls transformer no-load current, and manages cable charging current.
Yes. We can dispatch experienced engineers for on-site installation guidance, commissioning, and operator training. Remote technical support is also available 24/7 via video or phone.
Our RMU complies with IEC 62271-200 and IEC 62271-100 standards. We provide complete type test reports, routine test reports, and certificates of conformity. Customized designs for specific regional standards (e.g., GOST, ANSI) are also available upon request.
Standard lead time is typically 30–45 days after drawing approval, depending on configuration and quantity. We offer a 10-year warranty from commissioning, covering defects in design, materials, and manufacturing. After the warranty expires, we continue to provide lifetime technical support and spare parts supply.
Standard design supports altitude up to 2000m and monthly average humidity up to 95%. For higher altitudes or extreme humidity, we offer customized designs with adjusted insulation levels and anti-condensation measures. Please advise your site conditions.
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