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VCB Ring Main Units Series Ring Main Units (RMU)
2 Models available
Images are for illustration purposes only
VCB Ring Main Units — Vacuum Circuit Breaker RMU
VCB ring main units use vacuum circuit breakers for the transformer and feeder protection ways, providing full breaking capacity instead of load-break switching alone. Rated 12–24 kV, 630–1250 A with circuit-breaker protection modules, for distribution networks requiring fault interruption at each way.
Applications
Distribution networks with high fault duty
Transformer and feeder protection
Industrial and data center networks
Renewable plant collector feeders
Key Features
- Vacuum circuit breaker protection modules
- Full fault-breaking capacity per way
- 12–24 kV, 630–1250 A
- Load-break plus breaker protection
- Relay protection and metering options
- Compact ring-main configuration
Specifications Range
All specifications and dimensions can be customized upon request
Model Selector
| Key parameters | Model Range |
|---|---|
| Rated Voltage | 12 |
| Rated Current | 630 A |
| Max. Fuse Rating | 63 A |
| Short-time Withstand Current | 20 kA |
| Protection Level | IP4X |
| Standard | GB3906, IEC 62271-200 |
| Compare | Model | Series | Rated voltage (kV) | Current (A) | Frequency (Hz) | Standard | Weight | Dimensions |
|---|---|---|---|---|---|---|---|---|
| VCB-12-630 | VCB Ring Main Units | 12 | 630 | - | GB3906, IEC 62271-200 | 131 kg | 2015×2015×4790 mm | |
| VCB-12-1250 | VCB Ring Main Units | 12 | 630 | - | GB3906, IEC 62271-200 | 141 kg | 2660×2660×6325 mm |
Product Drawing
Ring Main Unit - VCB-12-1250
Note: This is a general product illustration. For detailed technical drawings and specifications, please contact our engineering team.
Selection Guide
Protection
Choose VCB ways where fault interruption and relay protection are required.
Rating
Match 630–1250 A and the network fault level.
- Frequently Asked Questions
What is a VCB ring main unit?
A VCB RMU uses vacuum circuit breakers instead of load-break switches, providing full fault-breaking and protection capability at each way.
Load-break vs breaker?
Load-break switches only switch load current; vacuum circuit breakers also interrupt fault currents with relay protection.
Instant Selection & Quote Calculator
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Certification
The values below are computed from what you selected above. Anything that cannot be computed yet is shown as an em dash — never as zero.
Iₙ = S / (√3·U) · I_sc = 100·Iₙ / uₖ · S_sc = √3·U·I_sc · I_p = k·Iₖ
Still required to complete the calculation: rated capacity S, impedance voltage uₖ, short-time or peak withstand current.
Per-model values (P0 / Pk / uₖ declared by the factory, losses, noise, temperature rise, dimensions, weight) are not in the product library: those rows stay at an em dash until the factory parameter sheet is supplied. An em dash means the value is unavailable — it is never rendered as zero.
Reference prices are for estimation only and do not constitute a formal offer.
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