Usune 15 Kv 1250a Vcb Vacuum Circuit Breaker is developed for indoor medium-voltage power systems requiring higher current capacity and reliable switching performance. With advanced vacuum interruption technology, durable mechanical design, and compliance with IEC and GB standards, it provides an effective solution for industrial plants, substations, power stations, and large electrical distribution networks.
Large-scale electrical systems often require circuit breakers with higher current-carrying capability to support continuous operation. The Usune 15 Kv 1250a Vcb Vacuum Circuit Breaker is designed with a rated current of 1250A, making it suitable for applications with higher power demand.
The optimized conductive structure improves current transmission efficiency and helps control temperature rise during operation. This allows the equipment to maintain stable electrical performance in industrial environments where reliability and continuous power supply are critical.
Fault interruption capability is a key factor when selecting medium-voltage switching equipment. The circuit breaker adopts vacuum arc extinguishing technology to quickly interrupt abnormal currents and protect important electrical equipment such as transformers, motors, and generators.
By providing reliable fault isolation, the equipment helps reduce the impact of short-circuit events and improves overall power system safety.
| Feature | Benefit |
| 1250A rated current | Suitable for higher-load electrical systems |
| Vacuum interruption technology | Fast and reliable fault clearing |
| Strong breaking capability | Improves system protection |
| Durable structure | Supports long-term operation |
The vacuum interrupter is the core component responsible for electrical isolation and fault interruption. By using a high-vacuum environment, the circuit breaker achieves rapid arc extinction without the need for additional insulating oil or gas.
This technology provides excellent electrical endurance and stable interruption performance throughout the service life of the equipment.
For industrial power systems, unexpected downtime can result in significant production losses. The internal design of the circuit breaker ensures reliable opening and closing performance during repeated switching operations.
The 15 Kv 1250a Vcb Vacuum Circuit Breaker is suitable for applications requiring frequent switching, stable protection, and long-term operational reliability.
Medium-voltage projects usually have different requirements depending on load capacity, system scale, and future expansion plans. Choosing the correct rated current helps improve system efficiency and avoid unnecessary equipment limitations.
The following comparison shows the differences between common vacuum circuit breaker configurations.
| Comparison Item | 12kV 630A Vacuum Circuit Breaker | 15kV 1250A Vacuum Circuit Breaker |
| Rated Voltage | 12kV class | 15kV class |
| Rated Current | 630A | 1250A |
| Load Capacity | Suitable for general distribution systems | Suitable for higher-power industrial systems |
| Application Scale | Small and medium electrical projects | Large industrial and energy projects |
| Protection Requirement | Standard fault protection | Higher-level fault interruption requirements |
| Switching Demand | Normal switching operations | Frequent switching applications |
| Typical Applications | Commercial facilities, small substations | Power plants, factories, mining, large substations |
Compared with lower-current models, the Usune 15 Kv 1250a Vcb Vacuum Circuit Breaker provides greater current handling capability and stronger adaptability for high-demand electrical systems.
For projects involving large motors, transformers, production equipment, and continuous power distribution, selecting a higher-capacity vacuum circuit breaker helps improve operational stability and provides additional capacity for future system upgrades.
Electrical equipment performance can be affected by temperature, humidity, altitude, and surrounding conditions. This vacuum circuit breaker is designed according to specific environmental requirements to ensure stable operation in indoor medium-voltage applications.
| Environmental Parameter | Requirement |
| Ambient Temperature | -15℃ to +40℃ |
| Maximum Altitude | ≤1000m |
| Daily Average Humidity | ≤95% |
| Monthly Average Humidity | ≤90% |
| Earthquake Intensity | ≤10 degrees |
The product is suitable for indoor locations without fire hazards, explosion risks, severe pollution, chemical corrosion, or intense vibration.
By selecting equipment according to environmental conditions, users can improve system reliability and reduce potential failures caused by unsuitable installation environments.
The mechanical operating system directly affects the service life and switching reliability of a vacuum circuit breaker.
The equipment adopts a reliable operating mechanism designed for stable opening and closing operations. After maintenance activities, especially component replacement or mechanical adjustment, the switch performance should be tested to ensure it meets the required technical conditions.
Many industrial facilities require frequent switching for equipment control and system protection. The robust mechanical structure ensures stable operation during repeated switching cycles.
This makes the product suitable for power distribution systems where both operational flexibility and protection reliability are required.
For international power projects, compliance with recognized standards is an important purchasing requirement. Usune vacuum circuit breakers are manufactured according to strict technical specifications and meet major electrical industry standards.
| Standard | Description |
| GB1984 | AC High Voltage Circuit Breaker Standard |
| GB/T11022 | Common Technical Requirements for High Voltage Switchgear and Control Equipment |
| JB3855 | Indoor AC High Voltage Vacuum Circuit Breaker Standard |
| DL/T402 | Technical Conditions for AC High Voltage Circuit Breaker Ordering |
| IEC56 | AC High Voltage Circuit Breaker Standard |
Usune operates under ISO 9001 quality management system, ISO 14001 environmental management system, and ISO 45001 occupational health and safety management system.
The products comply with IEC and GB standards and have CE certification, supporting international electrical project requirements.
The 15 Kv 1250a Vcb Vacuum Circuit Breaker is widely used in medium-voltage electrical systems requiring reliable switching control and fault protection.
Typical applications include industrial manufacturing plants, mining enterprises, power generation facilities, substations, and large electrical distribution networks.
A domestic industrial power project required reliable switching equipment for a medium-voltage distribution system. By applying the VS1 series indoor high-voltage vacuum circuit breaker, the project improved power system protection performance and achieved stable operation under continuous working conditions.
The equipment successfully supported reliable switching control while reducing risks caused by electrical faults and operational interruptions.
| Parameter | Specification |
| Product Type | Indoor High Voltage Vacuum Circuit Breaker |
| Rated Voltage | 15kV Class |
| Rated Current | 1250A |
| Frequency | AC System |
| Installation Environment | Indoor |
| Interruption Method | Vacuum Arc Interruption |
| Applicable Standards | IEC / GB |
| Certification | CE |
A 15kV vacuum circuit breaker provides reliable fault interruption, high electrical endurance, and stable performance for medium-voltage power distribution systems.
A 1250A model is suitable for electrical systems with higher load requirements, including industrial plants, substations, and energy infrastructure projects.
The circuit breaker is designed for indoor environments with temperatures from -15℃ to +40℃, altitude below 1000m, and controlled humidity conditions.
Yes. The product complies with IEC and GB standards and is manufactured under ISO 9001, ISO 14001, and ISO 45001 management systems with CE certification.
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