| Brand | ROCKWILL |
| Series | RHB |
| Rated voltage | 40.5kV/52kV/123kV/145kV/363kV |
| Rated current | up to 4000A |
| Rated peak withstand current | up to 158kA |
| Rated frequency | 50/60Hz |
The RHB type Live tank SF6 gas circuit breaker is specifically designed for outdoor high - voltage environments. Utilizing self - blast arc - extinguishing technology and taking advantage of the excellent insulating and arc - extinguishing properties of SF₆ gas.
It can quickly quench arcs, ensuring the efficient interruption of fault currents. With a compact and robust structure, it can adapt to various harsh weather conditions.
It boasts high reliability and a long service life, which can significantly reduce maintenance frequency, making it a key device for enhancing the safety and stability of power systems.
SF6 gas is used for arc extinguishing
Monitor with a pointer-type density relay
Adopt the self-blast arc extinguishing principle
Adopt pointer-type density relays for pressure and density monitoring
RHB-52
| Item | Unit | Parameter |
|---|---|---|
| Rated voltage | kV | 52 |
| Rated frequency | Hz | 50/60 |
| Rated current | A | up to 4000 |
| 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 | 95 |
| Power-frequency withstand voltage, 1 min across open contacts | kV | 95 |
| Rated lightning impulse withstand voltage, 1.2/50 μs | kV | 200 |
| Rated lightning impulse withstand voltage, 1.2/50 μs, across open contacts | kV | 250 |
| Rated filling pressure (abs. at 20 °C) circuit-breaker/other components | MPa | 0.5 |
| Minimum functional pressure (abs. at 20 °C) circuit-breaker/other components | MPa | 0.4 |
RHB-123/145
| Item | Unit | 123kV | 145kV |
|---|---|---|---|
| Rated voltage | kV | 123 | 145 |
| Rated frequency | Hz | 50/60 | |
| Rated current | A | up to 4000 | |
| 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,1min | kV | 230 | 275 |
| Power-frequency withstand voltage,1min across open contacts | kV | 265 | 315 |
| Rated lightning impulse withstand voltage,1.2/50 μs | kV | 550 | 650 |
| Rated lightning impulse withstand voltage,1.2/50 μs,across open contacts | kV | 650 | 750 |
| 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 capacity | pC | ＜5 | |
| SF₆ leakage rate per year | —— | ＜0.5% | |
| Maintenance cycle | Year | 30 | |
RHB-363
| Item | Unit | Parameter |
|---|---|---|
| Rated voltage | kV | 362 |
| Rated frequency | Hz | 50/60 |
| Rated current | A | up to 4000 |
| Rated short-time withstand current, up to 3 s | kA | up to 63 |
| Rated peak withstand current | kA | 158 |
| Rated short-duration power-frequency withstand voltage, 1 min | kV | 450 |
| Power-frequency withstand voltage, 1 min across open contacts | kV | 520 |
| Rated lightning impulse withstand voltage, 1.2/50 μs | kV | 1175 |
| Rated lightning impulse withstand voltage, 1.2/50 μs, across open contacts | kV | 1380 |
| Rated filling pressure (abs. at 20 ℃) circuit-breaker | MPa | 0.6 |
| Minimum functional pressure (abs. at 20 ℃) circuit-breaker | MPa | 0.5 |
RHB-40.5
RHB-72.5
RHB-123/145
RHB-170
RHB-252
RHB-362
| Ambient temperature | ‑30°C ~ +40°C |
| Altitude | ＜1000m |
| Wind speed | ＜34m/s |
| Daily temperature difference | ＜25°C |
| Solar irradiance | ＜ 0.1W/cm² |
| Monthly average relative humidity | ＜90% |
| Ice‑coating thickness | ＜10mm |
| Seismic acceleration resistance | Horizontal ＜0.2g, vertical ＜0.1g |
| Installation location | Outdoor |
The core difference is the arc-extinguishing medium. A VCB uses a high vacuum inside a sealed ceramic or glass envelope — the vacuum rapidly diffuses ions and metal vapor after current zero, achieving arc extinction in <10 ms. An SF₆ CB uses sulfur hexafluoride gas, which has strong electron affinity — it captures free electrons to form heavy negative ions, quickly depleting the arc channel's conductivity.
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.
Live tank breakers are well-suited for outdoor high-voltage distribution with a dispersed layout. Dead tank breakers flexibly adapt to both indoor and outdoor applications, especially in space-constrained substations or where compact installation is required.
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