HV Live tank SF6 gas circuit breaker 252kV 420kV 550kV
Key attributes
| Brand | ROCKWILL |
| Series | RHB |
| Rated voltage | 252kV-550kV |
| Rated current | up to 5000 A |
| Rated short-time withstand current | up to 63 |
| Rated peak withstand current | up to 158 |
Description
Equipped with CT-type spring mechanism, this outdoor live tank SF₆ breaker serves 50Hz three-phase grid for circuit control and protection, allowing single/three-pole switching and auto-reclosing.
With three-phase post porcelain structure and self-blast arc extinction, SF₆ fills all poles for insulation and arc quenching. Pointer density relay tracks gas status. Compact, low-power, low-noise and easy to install; customization supported.
Core Advantages
Three-phase post porcelain construction: Single shared spring mechanism for synchronized three-pole operation, neat compact layout for outdoor installation.
Integrated SF₆ gas system: Interconnected gas chambers across three poles; SF₆ serves as insulation & arc-quenching medium to guarantee steady performance.
Pointer density relay: Real-time SF₆ pressure & density monitoring for early fault warning and safe running.
Self-blast arc extinction: Lower required operating power and improved mechanical efficiency.
Customization available: Tailored design to satisfy individual project requirements, consult our sales team for details.
Main technical parameters
RHB-252
| Item | Unit | Parameter |
|---|---|---|
| Rated voltage | kV | 252 |
| Rated frequency | Hz | 50/60 |
| Rated current | A | up to 5000 |
| Rated short-time withstand current, up to 3 s | kA | up to 63 |
| Rated peak withstand current | kA | up to 158 |
| Rated short-duration power-frequency withstand voltage, 1 min | kV | 460 |
| Power-frequency withstand voltage, 1 min across open contacts | kV | 530 |
| Rated lightning impulse withstand voltage, 1.2/50 μs | kV | 1050 |
| Rated lightning impulse withstand voltage, 1.2/50 μs, across open contacts | kV | 1200 |
| Rated filling pressure (abs. at 20 ℃) circuit-breaker | MPa | 0.6 |
| Minimum functional pressure (abs. at 20 ℃) circuit-breaker | MPa | 0.5 |
| Temperature range (ambient) | ℃ | -30～+40 |
| Type of installation | — | outdoor |
| Partial discharge | pC | ＜5 |
| Annual SF₆ leakage rate | — | ＜0.5% |
| Maintenance cycle | Year | 30 |
RHB-420
| Item | Unit | Parameter |
|---|---|---|
| Rated voltage | kV | 420 |
| Rated frequency | Hz | 50/60 |
| Rated current | A | up to 5000 |
| Rated short-time withstand current, up to 3 s | kA | up to 63 |
| Rated peak withstand current | kA | up to 158 |
| Rated short-duration power-frequency withstand voltage, 1 min | kV | 740 |
| Power-frequency withstand voltage, 1 min across open contacts | kV | 850 |
| Rated lightning impulse withstand voltage, 1.2/50 μs | kV | 1425 |
| Rated lightning impulse withstand voltage, 1.2/50 μs, across open contacts | kV | 1550 |
| Rated filling pressure (abs. at 20 ℃) circuit-breaker | MPa | 0.6 |
| Minimum functional pressure (abs. at 20 ℃) circuit-breaker | MPa | 0.5 |
| Temperature range (ambient) | ℃ | -30～+40 |
| Type of installation | — | outdoor |
| Partial discharge | pC | ＜5 |
| Annual SF₆ leakage rate | — | ＜0.5% |
| Maintenance cycle | Year | 30 |
RHB-550
| Item | Unit | Parameter |
|---|---|---|
| Rated voltage | kV | 550 |
| Rated frequency | Hz | 50/60 |
| Rated current | A | up to 5000 |
| Rated short-time withstand current, up to 3 s | kA | up to 63 |
| Rated peak withstand current | kA | up to 158 |
| Rated short-duration power-frequency withstand voltage, 1 min | kV | 830 |
| Power-frequency withstand voltage, 1 min across open contacts | kV | 950 |
| Rated lightning impulse withstand voltage, 1.2/50 μs | kV | 1675 |
| Rated lightning impulse withstand voltage, 1.2/50 μs, across open contacts | kV | 2125 |
| Rated filling pressure (abs. at 20 ℃) circuit-breaker | MPa | 0.6 |
| Minimum functional pressure (abs. at 20 ℃) circuit-breaker | MPa | 0.5 |
| Temperature range (ambient) | ℃ | -30～+40 |
| Type of installation | — | outdoor |
| Partial discharge | pC | ＜5 |
| Annual SF₆ leakage rate | — | ＜0.5% |
| Maintenance cycle | Year | 30 |
Service Conditions
Ambient temperature: -30℃～+40℃
Altitude: ＜1000m
Max wind speed: ＜34m/s
Daily temperature variation: ＜25℃
Solar irradiance: ＜0.1W/cm²
Monthly average RH: ＜90%
Ice coating: ＜10mm
Seismic resistance: Horizontal＜0.2g, Vertical＜0.1g
Mounting: Outdoor
Outline Dimension Drawing
RHB-245
Documentation Resource Library HV SF6 circuit breaker
FAQ for HV SF6 circuit breaker
ABB’s high-voltage live-tank vacuum breakers are reliable but costly with long lead times. Hitachi Energy is mature yet lacks local high-voltage track records and smart features. Schneider Electric excels in 40.5kV distribution but is limited in voltage range and extreme performance. In contrast, Rockwill offers up to 363kV SF₆-free vacuum solutions with fast local service and spare parts delivery. Featuring robust mechanisms, full smart functions, and superior resistance to extreme cold, heavy salt fog, and short-circuit currents, our breakers ensure long maintenance-free service and lower LCC.
Q:Can Rockwill custom-engineer or modify Live tank Vacuum circuit breaker specifications to meet project-specific requirements?
A:
Rockwill provides comprehensive customized design and parameter modification for live tank vacuum circuit breakers to meet diverse project requirements. Backed by our professional R&D team, we flexibly adjust product structures, technical parameters and environmental adaptability, delivering exclusive tailored solutions in line with various on-site conditions and project standards.
In a live tank breaker, the arc chamber is mounted at the top or side of the column, exposed to ambient air. In a dead tank breaker, the arc chamber is placed inside the metal tank, fully sealed.
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