| Brand | ROCKWILL |
| Series | RHB |
| Rated voltage | 72.5kV |
| Rated current | up to 4000A |
| Rated peak withstand current | up to 125kA |
| Rated frequency | 50/60 |
| Rated voltage | kV | 72.5 |
| Rated frequency | Hz | 50/60 |
| Rated current | A | up to 4000 |
| Rated short-time withstand current, up to 3 s | kA | up to 50 |
| Rated peak withstand current | kA | up to 125 |
| Rated short-duration power-frequency withstand voltage, 1 min | kV | 140 |
| Power-frequency withstand voltage, 1 min across open contacts | kV | 160 |
| Rated lightning impulse withstand voltage, 1.2/50 μs | kV | 325 |
| Rated lightning impulse withstand voltage, 1.2/50 μs, across open contacts | kV | 375 |
| Rated filling pressure (abs. at 20 ℃) circuit-breaker /other components | MPa | 0.6 |
| Minimum functional pressure (abs. at 20 ℃) circuit-breaker/other components | MPa | 0.5 |
| Temperature range (ambient) | ℃ | -30～+40 |
| Type of installation | - | outdoor |
| Partial discharge | pC | ＜5 |
| SF₆ annual leakage rate | - | ＜0.5% |
| Maintenance cycle | Year | 30 |
Note: The parameters listed above apply to the standard 72.5kV configuration. Leveraging the scalable RHB platform, we offer customized solutions across the full voltage spectrum (11kV–363kV/550kV) to meet specific grid requirements. Please consult our engineering team for specialized designs regarding extreme altitudes, seismic zones, or non-standard frequency applications.
The self-blast principle utilizes the energy from the arc itself to assist in extinguishing it, significantly reducing the operating energy required by the mechanism. This results in lower mechanical stress on components, leading to smoother operation, reduced wear and tear, and a longer service life for the operating mechanism.
Yes. While our standard parameters are based on altitudes below 1000m, the RHB platform is designed with high insulation margins. For high-altitude applications, we can customize the insulation distance and sealing structures to ensure full performance compliance without the need for significant capacity derating.
ROCKWILL stands firmly behind the quality of the RHB Series. We provide a comprehensive 20-year warranty for the main body of the circuit breaker, reflecting our confidence in its hermetic sealing integrity and mechanical durability. This long-term coverage ensures peace of mind for your grid investment.
Absolutely. The RHB Series is designed with modularity in mind. The real-time SF₆ density monitoring system and other secondary components are easily accessible and replaceable. This allows for seamless upgrades to smarter monitoring solutions as your substation's digitalization needs evolve over time.
We understand that grid assets must last for decades. ROCKWILL guarantees a long-term supply chain for critical spare parts and special tools. Our standardized design across the voltage spectrum means that many common components are shared, simplifying inventory management for your maintenance teams.
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