High Voltage Live tank SF6 Circuit Breaker 72.5kV 126kV 145kV 252kV
Key attributes
| Brand | ROCKWILL |
| Series | RHB |
| Rated voltage | 72.5kV/126kV/145kV/252kV |
| Rated current | 3150/4000/5000A |
| Rated peak withstand current | up to 158 kA |
| Rated short-time withstand current up to | up to 63 kA |
| Rated frequency | 50/60Hz |
Description
The RHB series live-tank SF6 circuit breakers cover rated voltages of 72.5kV, 126kV, 145kV and 252kV.
Designed on self-blast interruption principle, the breaker utilizes partial energy from inner arc to extinguish fault arc reliably at preset timing.
It performs switching of rated load & fault current, three-pole synchronised opening/closing and high-speed auto-reclosing, serving for system control and fault protection in high-voltage power grids.
Main Features
Premium dynamic sealing with Glyd-ring & step-type seal, lowering startup friction and eliminating gas leakage effectively.
Imported stable control valve equipped with anti-slow-opening protection against abnormal gas pressure drop.
Hydraulic operating mechanism fitted with dual independent trip circuits plus double relay protection to improve operational reliability.
Self-blast arc extinguishing design, available in single or three-phase post porcelain insulator construction.
Pointer-type density monitor fitted for real-time SF6 gas pressure and density supervision.
Technical parameter
| Specifications | Unit | Value | ||||
|---|---|---|---|---|---|---|
| Rated voltage | kV | 72.5 | 126 | 145 | 252 | |
| Rated current | A | 3150/4000/5000 | ||||
| Rated frequency | Hz | 50/60 | ||||
| Rated short-time withstand current up to 3 s | kA | up to 63 | ||||
| Rated peak withstand current | kA | up to 158 | ||||
| 1 min power frequency withstand voltage (r.m.s) | To earth/Between phases | kV | 140 | 230 | 275 | 460 |
| Across isolating distance | kV | 160 | 300 | 315 | 530 | |
| Lightning impulse withstand voltage (peak) | To earth/Between phases | kV | 325 | 550 | 650 | 1050 |
| Across isolating distance | kV | 375 | 650 | 750 | 1200 | |
| Rated SF6 gas pressure (20℃) | MPa | 0.5 | 0.5 | 0.5 | 0.6 | |
| Rated SF6 annual leakage | % | ≤0.5 | ||||
Service environment
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
Overall Dimension Drawing
RHB-72.5
RHB-123/145
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.
live tank circuit breaker is a structural form of high-voltage circuit breaker, which is characterized by the use of ceramic insulation pillars to support key components such as arc extinguishing chamber and operating mechanism. The arc extinguishing chamber is usually arranged on the top or pillar of the ceramic pillar. It is mainly suitable for medium and high voltage power systems, with voltage levels covering the range of 72.5 kV to 1100 kV. live tank circuit breakers are common control and protection equipment in outdoor distribution devices such as 110 kV, 220 kV, 550 kV, and 800 kV substations.
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