Usune VS1-12 Indoor Vacuum Circuit Breaker is designed for indoor medium-voltage switchgear applications where stable switching performance and reliable protection are required. With advanced vacuum interruption technology, precise mechanical structure, and comprehensive interlocking design, it provides a practical solution for power distribution systems requiring safe and efficient operation.
For indoor medium-voltage systems, the compatibility between the circuit breaker and switchgear cabinet directly affects installation efficiency and project reliability.
The VS1-12 Indoor Vacuum Circuit Breaker is designed with multiple cabinet width options to meet different rated current and short-circuit breaking requirements. This flexible configuration allows engineers to select suitable dimensions according to switchgear design, installation space, and electrical performance requirements.
| Cabinet Width | Rated Current | Rated Short Circuit Breaking Current |
| 650mm | 630A | 20kA-31.5kA |
| 650mm | 1250A | 20kA-31.5kA |
| 800mm | 630A | 20kA-31.5kA |
| 800mm | 1250A | 20kA-40kA |
| 800mm | 1600A | 31.5kA-40kA |
| 1000mm | 630A-1600A | 20kA-40kA |
| 1000mm | 2500A-5000A | 31.5kA-50kA |
The optimized installation structure helps improve compatibility with different switchgear solutions and simplifies engineering design.
For withdrawable switchgear systems, the handcart position directly influences electrical connection safety.
The Usune VS1-12 Indoor Vacuum Circuit Breaker adopts a reliable handcart structure that supports smooth movement between test position and operating position. During commissioning, the handcart should be moved completely to the designated position until the mechanical mechanism reaches the correct locking status.
The position indication and mechanical locking system work together to ensure that the breaker can only operate when the required conditions are achieved.
| Position Status | Function |
| Test Position | Allows inspection and control circuit testing |
| Operating Position | Enables connection with the main circuit |
| Interlocked Position | Prevents unsafe operation |
In medium-voltage electrical systems, preventing operating errors is essential for equipment protection and operator safety.
The VS1-12 series integrates mechanical and electrical interlocking functions to avoid incorrect closing, tripping, or movement operations caused by improper conditions.
The locking system ensures reliable operation when the breaker position, control voltage, and secondary circuit conditions meet technical requirements.
| Interlock Function | Purpose |
| Mechanical interlock | Prevents operation when the breaker position is incorrect |
| Electrical locking | Prevents closing when control conditions are not satisfied |
| Position protection | Ensures safe switching between test and operating positions |
| System coordination | Improves cooperation between breaker and switchgear |
During installation, test operation, or daily use, some problems may occur due to control power issues, incorrect wiring, or improper mechanical positioning.
The following table provides possible causes and recommended solutions.
| Problem | Possible Cause | Recommended Solution |
| The handcart breaker cannot be closed manually or electrically at test position or operating position | The mechanical interlock has not reached the correct position | Move the handcart fully into position and confirm the locking mechanism is released |
| Manual or electrical closing cannot be performed | The locking circuit is not activated or voltage is outside the required range | Check the locking power supply and ensure the voltage meets technical requirements |
| Electric closing operation is unreliable | Anti-bounce circuits are installed repeatedly in both breaker and cabinet, causing interference | Remove one anti-bounce loop to prevent control circuit interference |
| Over-current tripping does not operate | The over-current trip board power supply is not activated | Switch on the protection board power supply and check the control circuit |
| Electrical energy storage, closing, and tripping functions cannot operate | Secondary power supply failure, incorrect voltage, loose airborne plug connection, or poor secondary wiring | Check secondary power supply, verify voltage range, reconnect plugs, and inspect wiring |
This troubleshooting design helps reduce commissioning time and improves maintenance efficiency for engineering teams.
Vacuum interruption technology is widely used in medium-voltage systems due to its reliable arc extinguishing capability and long electrical service life.
The VS1-12 Indoor Vacuum Circuit Breaker provides stable opening and closing performance through optimized vacuum interrupter design, helping protect electrical equipment during normal operation and fault conditions.
Compared with traditional switching technologies, vacuum interruption avoids the use of insulating oil and provides cleaner operation with reduced environmental impact.
Reliable operation also depends on accurate secondary wiring and proper control system connection.
During installation, engineers should confirm the following technical conditions:
| Inspection Item | Purpose |
| Secondary wiring connection | Ensure correct control signal transmission |
| Control voltage | Maintain reliable operation of electrical components |
| Airborne plug connection | Prevent operation failure caused by poor contact |
| Interlock function | Confirm safety protection performance |
Although the circuit breaker is designed for reliable indoor operation, regular inspection is recommended to maintain long-term performance.
The maintenance process should focus on mechanical components, electrical connections, and interlocking functions.
| Inspection Item | Maintenance Purpose |
| Operating mechanism | Confirm smooth closing and tripping operation |
| Mechanical structure | Check deformation caused by improper operation |
| Fasteners | Prevent loose components after repeated operation |
| Electrical connections | Maintain reliable control performance |
Before maintenance, the breaker should be placed in a safe condition. The energy storage mechanism should be released, the breaker should remain in tripping condition, and all power supplies should be disconnected.
Because the operating mechanism contains stored energy, maintenance should only be performed by qualified professionals following proper safety procedures.
The VS1-12 series supports different current ratings and breaking capacities to meet various medium-voltage project requirements.
| Parameter | Specification |
| Product Type | Indoor Vacuum Circuit Breaker |
| Series | VS1-12 |
| Rated Voltage | 12kV |
| Rated Current | 630A-5000A |
| Rated Frequency | 50Hz |
| Short Circuit Breaking Current | 20kA-50kA |
| Installation Type | Fixed / Handcart |
| Application | Indoor Medium Voltage Switchgear |
| Standards | IEC / GB |
| Certification | CE |
To ensure correct product selection, customers should provide detailed technical requirements before ordering.
| Required Information | Description |
| Product Model | Confirm breaker series and configuration |
| Quantity | Define project requirement |
| Rated Voltage | Match system voltage |
| Rated Current | Select suitable current capacity |
| Short Circuit Breaking Current | Confirm protection level |
| Operating Voltage | Match control system |
| Secondary Wiring Program | Select optional configuration |
| Spare Parts Requirement | Define required accessories |
| Special Requirements | Provide customized technical conditions |
Accurate technical information helps improve project compatibility and reduces installation adjustments.
Usune applies strict quality control throughout product design, manufacturing, and testing.
| Certification | Standard |
| Quality Management System | ISO 9001 |
| Environmental Management System | ISO 14001 |
| Occupational Health and Safety System | ISO 45001 |
| Electrical Standards | IEC and GB |
| Product Certification | CE |
These certifications demonstrate Usune's commitment to delivering reliable medium-voltage electrical equipment for international markets.
A domestic power distribution project required a reliable indoor switching device with accurate mechanical positioning and safe interlocking performance.
By applying the VS1 series indoor high-voltage vacuum circuit breaker, the project achieved stable operation within the switchgear system. The integrated interlocking structure improved operational safety, while the flexible cabinet configuration simplified installation and commissioning.
The VS1-12 series combines vacuum interruption technology with flexible installation structure, reliable interlocking functions, and compatibility with different indoor switchgear configurations.
Yes. The VS1-12 series supports handcart configurations and provides reliable test position and operating position control.
Engineers should check the handcart position, locking circuit, control voltage, secondary power supply, and electrical connections.
The product is designed for reliable operation with reduced maintenance requirements. However, periodic inspection of mechanical and electrical components is recommended.
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