Outdoor Live tank SF6 gas circuit breaker 72.5kV
Key attributes
| Brand | ROCKWILL |
| Series | RHB |
| Rated voltage | 72.5kV |
| Rated current | up to 4000A |
| Rated peak withstand current | up to 125kA |
| Rated frequency | 50/60 |
Description
Adopting self-blast arc extinguishing principle and three-phase post porcelain insulator structure, the breaker is equipped with a CT-type spring operating mechanism with three-pole linked operation. It uses SF₆ gas for full-phase insulation and arc quenching, fitted with pointer-type density relay for real-time SF₆ pressure and density monitoring.
Simple structure, low operating power, low noise, high stability and easy installation. Compliant with IEC / CEI / GB / JB / DL standards, and supports customized manufacturing.
Main Features
Self-blast arc extinguishing design reduces operating work and improves mechanical efficiency
High breaking performance: rated current up to 5500A, short-circuit breaking current up to 50kA
Electrical endurance: 50kA × 21 times breaking capacity; mechanical life up to 10,000 times
Precise sealing: annual SF₆ leakage rate ≤ 0.5%
Strong environmental adaptability, applicable for Class IV polluted areas and extreme cold climate
Optional porcelain column type / handcart type structure
Real-time gas density monitoring ensures safe and stable operation
Main technical parameters
| 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 |
Service environment
Ambient temperature: -25℃～+40℃
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
Outline Dimension Drawing
Order Information
Circuit breaker model & specification
Rated voltage, rated current and breaking current
Site environment: temperature, altitude, pollution grade
Motor voltage and opening/closing coil voltage
Primary terminal wiring direction
Spare parts and special tools (separate order)
Solutions for SF6 circuit breaker
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Rockwill’s Arc Quenching Technology for MV/HV Circuit Breakers: From Classical Interruption to Intelligent CoordinationRockwill's arc quenching technology system is essentially a microcosm of the power switchgear field's response to the dual challenges of "higher interrupting performance" and "zero environmental impact across the entire lifecycle." Its complete landscape consists of three parts: high-performance hardware arc quenching platforms, stringent standard certification systems, and future-oriented intelligent switching control strategies. This constitutes a capability leap from "being able to interrupt"
Documentation Resource Library SF6 circuit breaker
FAQ for 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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