| Brand | ROCKWILL |
| Model NO. | HV Live Tank Vacuum Circuit Breaker Direct Supply -72.5kV |
| Rated voltage | 72.5kV |
| Rated normal current | 3150A |
| Rated frequency | 50/60Hz |
| Series | RVB |
The 72.5kV high-voltage vacuum circuit breaker is a highly reliable electrical device that utilizes vacuum as both the arc-extinguishing and insulating medium. It features excellent performance, including high current-breaking capacity and long electrical life, enabling it to quickly and effectively interrupt load and short-circuit currents to protect power systems.
With a compact structure suitable for both indoor and outdoor applications in 72.5kV networks, it fully complies with relevant international and national standards, ensuring stable and safe operation in power distribution systems.
Excellent arc - extinguishing and insulation: Using vacuum as the arc - extinguishing and insulation medium, it has strong arc - extinguishing ability and stable and reliable insulation performance. It can effectively prevent arc reignition and other problems, ensuring the safe operation of the power system.
Powerful breaking capacity: It can quickly and efficiently cut off load current and short - circuit current. It has high rated current and short - circuit breaking current parameters. For example, the rated current can reach 3150A, and the rated short - circuit breaking current can reach 40kA, which can meet the current breaking requirements of different working conditions in the power system.
Long mechanical and electrical life: The mechanical life can reach 20,000 times, and the electrical life can reach 30 times. It is not easy to be damaged by frequent operations, reducing the frequency of equipment replacement and maintenance, and lowering the operation and maintenance costs.
Good environmental adaptability: The operating ambient temperature range is - 40~55℃, enabling it to work stably in various climatic conditions. It can operate normally in areas with an altitude of no more than 5000m, is suitable for pollution class Ⅲ environments, has an aseismatic class of AG5, and a wind speed resistance of 34m/s, adapting to different geographical and environmental conditions.
Reasonable structural design: It has a compact structure, occupies a small space, and is easy to install and arrange. There are multiple structural forms available (such as the common porcelain column type and handcart type), which is convenient for integration with different power systems and equipment.
Compliance with standards and specifications: It is manufactured in strict accordance with relevant international and national standards, ensuring stable product quality and performance, and enabling reliable operation in the power system.
| Item | Unit | Specification |
|---|---|---|
| Rated Voltage (Ur) | kV | 72.5 |
| Rated Frequency | Hz | 50 / 60 |
| Rated Short-Circuit Breaking Current | kA | 31.5 / 40 |
| Rated Short-Time Withstand Current (Duration) | kA / s | 31.5 / 40 (4s) |
| Rated Peak Withstand Current | kA | 80 / 100 |
| 1min Power-Frequency Withstand Voltage (to earth / between phases) | kV | 160 |
| 1min Power-Frequency Withstand Voltage (across open contacts) | kV | 185 |
| Rated Lightning Impulse Withstand Voltage (to earth / between phases) | kV | 350 |
| Rated Lightning Impulse Withstand Voltage (across open contacts) | kV | 400 |
| Partial Discharge Level | pC | ＜10 |
| Operating Ambient Temperature | ℃ | -50 ~ +60 |
Model and format of the circuit breaker.
Rated electrical parameters (voltage, current, breaking current, etc).
Working conditions for using (environment temperature, altitude, and environment pollution level).
Rated control circuit electrical parameters (Rated voltage of energy-store motor and Rated voltage of opening, closing coil).
Names and quantities of spare items needed, parts and special equipment and tools (to be otherwise ordered).
The wire connecting direction of the primary upper terminal.
| 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 |
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.
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.
Rockwill’s SF6-free eco-friendly vacuum circuit breakers (rated up to 40.5kV) are built on a proprietary, fully independent R&D technical system, offering significant scalable and series-based advantages. Furthermore, backed by our rigorous digital manufacturing management system, we formally commit to and strictly fulfill a 10-year warranty requirement.
Rockwill is an open-minded, professional R&D and manufacturing enterprise. We fully accept ODM/OEM partnership orders from Europe, North America, and all other global regions.
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