Usune Vacuum Circuit Breaker 630a is designed for indoor medium-voltage power distribution systems requiring reliable switching performance and long service life. With advanced vacuum interruption technology, optimized mechanical structure, and strict manufacturing control, it provides a dependable solution for electrical protection and switching applications.
Rated current is one of the most important factors when selecting a medium-voltage circuit breaker. The Usune Vacuum Circuit Breaker 630a is designed with a rated current of 630A, providing stable current carrying capability for medium-voltage distribution systems.
The optimized conductive structure helps reduce electrical losses and maintain reliable operation under continuous load conditions. This configuration offers a balanced solution between performance, system capacity, and equipment investment.
Fault interruption capability directly affects the safety of electrical systems. This vacuum circuit breaker supports rated short-circuit breaking currents of 20kA, 25kA, 31.5kA, and 40kA, allowing customers to select suitable protection levels according to project requirements.
The vacuum interruption system provides rapid arc extinguishing performance, helping isolate abnormal currents and protect transformers, motors, cables, and other connected equipment.
| Performance Item | Specification |
| Rated Voltage | 12kV |
| Rated Current | 630A |
| Rated Frequency | 50Hz |
| Rated Short Circuit Breaking Current | 20kA / 25kA / 31.5kA / 40kA |
| Rated Short Time Withstand Current | 20kA / 25kA / 31.5kA / 40kA |
| Short Circuit Duration | 4s |
| Lightning Impact Withstand Voltage | 75kV |
| Power Frequency Withstand Voltage | 42kV |
For medium-voltage switching equipment, mechanical durability directly affects operating costs and maintenance frequency.
The circuit breaker adopts reliable mechanical components designed for repeated opening and closing operations. Under standard conditions, the mechanical service life can reach 20,000 operations, providing long-term operational stability.
| Mechanical Parameter | Value |
| Mechanical Life | 20,000 Operations |
| Rated Current Breaking Number | 20,000 Operations |
| Short-Time Current Breaking Number | Up to 50 Operations |
| Contact Wear Allowance | 3mm |
Stable switching performance helps maintain electrical system reliability. The equipment is designed with precise opening and closing control parameters to reduce switching impact and improve operational consistency.
| Parameter | Specification |
| Opening Time | 20-50ms |
| Closing Time | 35-70ms |
| Contact Closing Bounce Time | ≤2ms |
| Three-Phase Opening & Closing Synchronism | ≤2ms |
| Contact Distance | 11±1mm |
| Over Travel | 3.5±0.5mm |
Although the circuit breaker is designed for reliable operation, regular inspection is recommended according to actual working conditions.
For equipment installed in environments with dust, moisture, or corrosion risks, surface conditions should be checked periodically. Dust on insulation surfaces should be removed with a dry cloth, followed by cleaning with suitable mild cleaning agents.
Cleaning materials should be compatible with plastic and synthetic rubber components. Strong solvents such as carbon tetrachloride or trichloroethylene should not be used.
Mechanical components should be inspected according to operating frequency and switching conditions.
During inspection, engineers should check whether structural components have deformation caused by improper operation. Any damaged or abnormal parts should be replaced in time to maintain safe operation.
After repeated switching operations, mechanical fasteners may loosen due to vibration and mechanical stress.
For breakers below 31.5kA, inspection is recommended after approximately 6000 operations. For 40kA breakers, inspection should be performed after approximately 2000 operations.
The condition of fasteners, clamps, and retaining rings should be checked, and any abnormal components should be adjusted or replaced according to actual conditions.
When the circuit breaker is stored for a long period or operated infrequently, moving parts may experience mechanical resistance.
To maintain operating flexibility, at least five cycles of energy storage, closing, and tripping operations should be performed annually. This helps ensure that mechanical components remain in proper working condition.
Insulation performance is essential for safe medium-voltage operation.
At least one insulation test should be conducted annually to evaluate vacuum arc-chute condition and verify whether the insulation strength of other insulating components has decreased.
Industrial frequency voltage withstand testing can be used to confirm insulation reliability and identify potential problems before operation failure occurs.
Before maintenance, the circuit breaker should be placed in a non-energy-storage and tripping condition. All power supplies must be disconnected before inspection.
Since the energy storage mechanism and closing springs contain stored energy, improper handling may cause unexpected operation and create safety risks.
Maintenance should only be performed by qualified professionals following proper safety procedures.
When selecting a vacuum circuit breaker, rated current should match the actual electrical load requirements.
The 630A configuration is suitable for medium-voltage systems requiring reliable protection, stable switching performance, and efficient equipment utilization. Compared with higher-current models, it provides a practical balance between electrical capability and project cost.
The Usune Vacuum Circuit Breaker 630a is an ideal choice for projects where moderate current demand, reliable protection, and long-term operation are key considerations.
Different electrical projects may require different technical configurations. The Vacuum Circuit Breaker 630a can be selected according to rated voltage, short-circuit breaking capacity, operating voltage, secondary wiring requirements, and spare parts needs.
This flexibility allows engineers to configure the equipment according to actual system conditions and improve compatibility with complete switchgear solutions.
| Selection Factor | Product Advantage |
| Medium current requirements | Provides suitable 630A capacity |
| Reliable protection needs | Supports multiple short-circuit levels |
| Long-term operation | Designed for durable performance |
| Project customization | Supports different technical configurations |
| Maintenance planning | Allows condition-based inspection |
To ensure correct product selection, customers should provide the following information when ordering:
| Requirement | Description |
| Product Model | Confirm required breaker type |
| Quantity | Specify project demand |
| Rated Voltage | Match system voltage |
| Rated Current | Confirm current requirement |
| Short Circuit Breaking Current | Select protection level |
| Operating Voltage | Match control system |
| Secondary Wiring Program | Optional configuration |
| Spare Parts Requirement | Specify accessories |
| Special Requirements | Customized project needs |
Usune applies strict quality management throughout product design and manufacturing.
The company operates under:
| 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 products for global customers.
| Parameter | Specification |
| Product Type | Indoor Vacuum Circuit Breaker |
| Rated Voltage | 12kV |
| Rated Current | 630A |
| Frequency | 50Hz |
| Rated Insulation Level | 42kV / 75kV |
| Breaking Current | 20kA-40kA |
| Mechanical Life | 20,000 Operations |
| Operating Voltage | AC110/220V, DC110/220V |
| Energy Storage Time | ≤10s |
| Applicable Standards | IEC / GB |
| Certification | CE |
The main factors include rated voltage, current capacity, short-circuit breaking capability, installation conditions, and future system requirements.
Under standard operating conditions, the mechanical life can reach 20,000 operations, providing reliable long-term performance.
Regular inspection of insulation surfaces, mechanical components, fasteners, and operating performance is recommended according to operating conditions.
Vacuum interruption provides fast arc extinguishing, reliable fault isolation, and long electrical service life without the environmental concerns associated with oil-based technologies.
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No. 298, Wei 17th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou City, Zhejiang Province, China
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