Usune Vacuum Circuit Breaker 12kv 24kv is designed for medium-voltage power distribution systems requiring reliable installation performance, accurate commissioning, and stable operation. Covering both 12kV and 24kV voltage levels, the product provides flexible solutions for different electrical system requirements.
With strict quality control under ISO 9001, ISO 14001, and ISO 45001 management systems, and compliance with IEC and GB standards with CE certification, Usune provides dependable medium-voltage switching equipment for global power projects.
Before installation, a complete inspection should be carried out to confirm that the equipment meets project requirements and remains in proper condition after transportation.
The inspection process includes checking whether the circuit breaker specifications comply with the contract, confirming that technical documents and accessories are complete, and verifying that there is no visible damage on the breaker surface or insulated components.
| Inspection Item | Inspection Purpose |
| Product specification | Confirm compliance with contract requirements |
| Technical documents | Ensure complete installation and operation information |
| Accessories | Verify supplied components are complete |
| External structure | Check for transportation damage |
| Insulated components | Confirm mechanical integrity |
If any damage or abnormal condition is found during inspection, photographs should be taken on-site and provided to the supplier for further evaluation.
The vacuum arc-chute is a key component affecting interruption reliability.
Before installation, the vacuum condition should be examined through an industrial frequency voltage withstand test. The fracture area should withstand 42kV industrial frequency voltage for one minute without flashover or breakdown.
This test helps confirm the insulation capability of the vacuum interrupter and ensures safe operation after installation.
For withdrawable circuit breaker applications, correct contact connection is essential for reliable electrical performance.
When the handcart breaker is installed together with the switchgear cabinet, the contact depth between dynamic and static contacts should be maintained between 15mm and 25mm.
Proper contact insertion ensures stable current transmission and reduces the risk of abnormal heating caused by insufficient connection.
| Installation Parameter | Requirement |
| Installation Type | Handcart configuration |
| Contact Depth | 15mm-25mm |
| Main Purpose | Ensure reliable electrical connection |
For fixed-type breakers, the installation surface should remain flat and stable.
If the four mounting points are not located on the same plane, adjustment washers should be used to prevent structural deformation caused by uneven mechanical stress.
When connecting the breaker outlet terminal with busbars, the connection point should not bear continuous pulling force, pressing force, or torque. Proper mechanical support helps maintain connection reliability during long-term operation.
After installation is completed, the breaker should be inspected carefully to confirm that no foreign materials remain inside the equipment.
Dust, metal particles, or other contaminants may affect insulation performance and operational reliability, therefore cleaning should be completed before commissioning.
The dust-proof cover on the insulated drum should be checked according to rated current requirements.
| Rated Current | Dust-Proof Cover Requirement |
| Below 1250A | Dust-proof cover can be installed |
| 1250A and above | Dust-proof cover should be removed |
This configuration helps maintain appropriate heat dissipation performance under different current conditions.
After installation, the Usune Vacuum Circuit Breaker 12kv 24kv should complete commissioning tests before being placed into service.
The testing process verifies electrical performance, mechanical operation, insulation condition, and safety protection functions.
| Test Item | Purpose |
| Opening test | Verify reliable interruption performance |
| Closing test | Confirm stable closing operation |
| Insulation test | Check insulation reliability |
| Control circuit test | Verify signal transmission |
| Interlock test | Confirm safe operation logic |
Mechanical testing ensures that the operating mechanism works correctly after installation.
The inspection should confirm that closing, tripping, position indication, and mechanical movement operate smoothly.
| Inspection Area | Evaluation Purpose |
| Closing mechanism | Confirm accurate closing action |
| Tripping mechanism | Ensure reliable fault interruption |
| Position indication | Verify operating status |
| Mechanical structure | Check operation stability |
For engineering contractors and system integrators, installation efficiency and commissioning reliability directly affect project delivery time.
The Usune Vacuum Circuit Breaker 12kv 24kv provides standardized installation requirements and clear testing procedures, helping reduce installation errors and improve commissioning efficiency.
The product supports different installation configurations according to project requirements, allowing engineers to achieve better coordination between the breaker, switchgear cabinet, and protection system.
Its standardized design simplifies system integration and helps improve overall electrical reliability.
When selecting medium-voltage switching equipment, rated voltage is one of the most important factors affecting system compatibility.
The 12kV and 24kV configurations provide different insulation levels and application advantages, allowing customers to select suitable equipment according to actual grid requirements.
| Comparison Item | 12kV Version | 24kV Version |
| Rated Voltage | 12kV | 24kV |
| System Requirement | Standard medium-voltage systems | Higher voltage distribution systems |
| Insulation Requirement | Suitable for 12kV insulation coordination | Requires higher insulation capability |
| Equipment Selection Focus | Efficient solution for common applications | Suitable for projects requiring higher voltage margin |
| Installation Consideration | More compact switchgear design | Designed for higher voltage applications |
Different projects may require different installation structures according to maintenance strategy and switchgear design.
| Comparison Item | Fixed Type | Handcart Type |
| Installation Method | Fixed installation inside switchgear | Withdrawable structure |
| Maintenance Method | Requires shutdown during replacement | Easier inspection and replacement |
| Space Requirement | More compact structure | Requires operating clearance |
| Application Preference | Suitable for stable systems | Suitable for flexible operation requirements |
Compared with traditional switching solutions, vacuum circuit breakers provide reliable interruption performance, improved insulation characteristics, and reduced environmental impact.
| Selection Factor | Usune Advantage |
| Voltage Options | Supports 12kV and 24kV systems |
| Installation Flexibility | Available in fixed and handcart configurations |
| Operation Reliability | Stable vacuum interruption technology |
| Commissioning Efficiency | Standardized installation and testing process |
| Quality Assurance | ISO 9001, ISO 14001, ISO 45001, IEC and GB, CE certified |
Although the circuit breaker is designed for reliable operation, regular inspection helps maintain long-term performance.
Maintenance should focus on mechanical operation, insulation condition, connection reliability, and control system performance.
| Inspection Item | Purpose |
| Mechanical mechanism | Ensure smooth opening and closing |
| Insulation condition | Maintain electrical safety |
| Connection parts | Prevent contact problems |
| Control system | Ensure reliable operation signals |
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 trained professionals following safety procedures.
To ensure correct product configuration, customers should provide complete technical requirements before ordering.
| Information Required | Purpose |
| Rated voltage | Confirm 12kV or 24kV requirement |
| Rated current | Match system load requirements |
| Short circuit breaking current | Select suitable protection capability |
| Installation type | Confirm fixed or handcart structure |
| Cabinet requirements | Ensure mechanical compatibility |
| Special requirements | Support customized solutions |
| Parameter | Specification |
| Product Type | Indoor Vacuum Circuit Breaker |
| Rated Voltage | 12kV / 24kV |
| Rated Frequency | 50Hz |
| Installation Type | Fixed / Handcart |
| Interruption Method | Vacuum Arc Interruption |
| Application | Medium Voltage Distribution Systems |
| Standards | IEC / GB |
| Certification | CE |
Before installation, customers should verify product specifications, accessories, external condition, vacuum interrupter insulation performance, and technical documents.
Correct contact depth ensures stable electrical connection between the breaker and switchgear, reducing contact resistance and improving operational safety.
The main difference is rated voltage and insulation capability. The 24kV version is designed for systems requiring higher voltage protection margins.
Yes. Installation inspection, electrical testing, and mechanical commissioning should be completed by qualified personnel before operation.
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