Usune Vacuum Circuit Breaker 1250a is designed for medium-voltage electrical systems requiring reliable protection and intelligent control functions. By integrating anti-bounce protection, locking mechanisms, electronic over-current tripping technology, and maintenance-friendly design, it provides a safer and more efficient solution for industrial power distribution, substations, and electrical infrastructure projects.
Repeated closing operations may occur if the closing signal is not cancelled in time, which can affect equipment safety and shorten the service life of electrical components.
To prevent this problem, the Usune Vacuum Circuit Breaker 1250a is equipped with an internal anti-bounce control loop. After the closing operation is completed, the control circuit automatically cuts off the closing loop when necessary, preventing unintended multiple re-closing operations.
This function improves switching safety and reduces mechanical stress caused by repeated closing actions.
| Control Function | Customer Benefit |
| Anti-bounce control | Prevents repeated closing operations |
| Automatic closing loop interruption | Improves operational safety |
| Reliable control logic | Reduces switching errors |
Incorrect operation during unstable control conditions may cause electrical equipment damage or system risks. To avoid closing operations when the secondary control power supply is not activated or does not meet technical requirements, the circuit breaker integrates a locking device.
The locking mechanism can also be combined with other interlocking functions according to customer requirements, helping engineers create safer and more coordinated power distribution systems.
This feature is especially valuable in applications where multiple electrical devices need coordinated operation.
Fast and accurate fault protection is essential for medium-voltage power systems. Unlike traditional tripping coil circuits, the electronic over-current tripping device provides more precise control and faster response.
The intelligent protection unit receives three-phase current signals from the secondary side of the current transformer and continuously compares the measured values with preset parameters.
When the detected current exceeds the configured setting value, the device sends an operation signal, activates the breaker tripping circuit, and completes the over-current protection process.
| Parameter | Specification |
| Operation Voltage | AC85V~265V |
| Operation Voltage | DC80V~300V |
| Rated Current Setting | 5A (standard configuration) |
| Protection Method | Three-phase current monitoring |
The electronic over-current protection system improves protection accuracy compared with conventional solutions. It helps reduce unnecessary power interruptions while ensuring rapid isolation during abnormal operating conditions.
For industrial facilities with sensitive electrical equipment, this intelligent protection capability helps improve system stability and operational safety.
A vacuum circuit breaker must provide not only electrical interruption but also reliable operation control during daily use.
The Usune Vacuum Circuit Breaker 1250a combines mechanical operating reliability with intelligent control functions to ensure stable opening and closing performance.
The integrated protection design helps operators reduce risks caused by incorrect operation and improves the overall safety level of medium-voltage systems.
Different projects may require different protection logic and control methods. The locking device and control system can support customized interlocking functions according to customer requirements.
This flexibility allows the equipment to be adapted to various industrial power distribution configurations.
During normal operation, the circuit breaker is designed for low maintenance requirements. Special bearings, surface treatment technology, and long-life lubricating grease are applied to improve mechanical durability.
The design allows the equipment to maintain reliable operation throughout its service life under normal working conditions.
Although the Vacuum Circuit Breaker 1250a is designed with maintenance-friendly features, operating environments and equipment configurations may vary.
Factors such as installation conditions, operating frequency, and vacuum arc-chute manufacturers may influence long-term performance. Therefore, necessary inspection and maintenance are still recommended to ensure safe and reliable operation.
| Maintenance Item | Purpose |
| Mechanical performance inspection | Ensure stable opening and closing operation |
| Component condition check | Identify potential failures early |
| Operating mechanism inspection | Maintain switching reliability |
| Electrical performance testing | Confirm protection function |
To ensure correct configuration, customers should provide the following information when ordering:
| Required Information | Description |
| Product model | Confirm the required breaker type |
| Product quantity | Specify project demand |
| Rated voltage | Match system voltage requirements |
| Rated current | Confirm current capacity |
| Rated short-circuit breaking current | Select suitable protection capability |
| Rated operating voltage | Match control system requirements |
| Secondary wiring program | Optional configuration |
| Spare parts requirements | Specify required accessories |
| Special requirements | Customized project needs |
Providing accurate technical information during ordering helps ensure proper equipment selection and smoother project installation.
The Usune Vacuum Circuit Breaker 1250a is suitable for medium-voltage applications requiring reliable switching, intelligent protection, and stable operation.
It can be applied in industrial manufacturing facilities, power plants, substations, mining enterprises, and other electrical distribution systems.
A domestic industrial power project required a reliable medium-voltage switching device with accurate protection functions and stable operation capability.
By applying the VS1 series indoor high-voltage vacuum circuit breaker, the project improved electrical protection performance and achieved reliable operation under continuous working conditions. The intelligent protection system helped reduce operational risks and improved overall power system safety.
Usune focuses on quality control and product reliability throughout design and manufacturing.
The company operates according to:
| Certification | Standard |
| Quality Management | ISO 9001 |
| Environmental Management | ISO 14001 |
| Occupational Health and Safety | ISO 45001 |
| Electrical Standards | IEC and GB |
| Product Certification | CE |
These certifications demonstrate Usune's commitment to providing reliable medium-voltage electrical equipment for global markets.
| Parameter | Specification |
| Product Type | Indoor Vacuum Circuit Breaker |
| Rated Current | 1250A |
| Application | Medium Voltage Power Distribution |
| Protection Function | Over-current Protection |
| Control Function | Anti-Bounce / Locking Control |
| Tripping Type | Electronic Intelligent Tripping |
| Applicable Standards | IEC / GB |
| Certification | CE |
The product includes anti-bounce protection, locking protection, and electronic over-current protection to improve switching safety and fault response capability.
Electronic protection provides more accurate current monitoring and faster response compared with traditional tripping circuits, helping protect electrical equipment from abnormal current conditions.
The product is designed for low maintenance operation. However, regular inspection is recommended according to operating environment and usage conditions to ensure long-term reliability.
Customers should provide model, quantity, rated voltage, rated current, short-circuit breaking current, operating voltage, secondary wiring requirements, spare parts requirements, and any special specifications.
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No. 298, Wei 17th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou City, Zhejiang Province, China
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