Usune Fixed Vacuum Circuit Breaker is designed for medium voltage switchgear applications that require stable installation and simplified system integration. Based on VS1 series technology, the product combines standardized installation dimensions, reliable vacuum interruption performance, and flexible rated current configurations to help engineers reduce design complexity and improve project execution efficiency.
In medium voltage switchgear projects, the compatibility between the breaker and cabinet structure directly affects installation accuracy and project progress. The fixed installation structure allows the breaker to be mounted directly inside the cabinet without requiring a withdrawal mechanism, making it suitable for systems with stable operating positions.
The standardized structural design helps simplify cabinet arrangement, reduce mechanical complexity, and improve the connection reliability between the breaker and the switchgear system. According to different rated current requirements, the product can be matched with different cabinet widths and installation dimensions to meet various engineering designs.
For engineering projects, installation dimensions are one of the key factors before equipment selection. The fixed type structure provides defined mounting dimensions to help customers complete cabinet design and equipment integration more efficiently.
During installation, the mounting surface should remain flat to prevent overall structural deformation caused by uneven mechanical stress. When connecting the fixed breaker with the busbar system, the outlet terminal should not bear continuous pulling force, pressure, or torque, ensuring that the mechanical structure remains stable after installation.
Different power systems have different requirements for voltage level, current capacity, and protection capability. Before ordering, customers need to confirm the rated voltage, rated current, short circuit breaking capacity, operating voltage, and secondary wiring requirements.
Usune Fixed Vacuum Circuit Breaker provides multiple current configurations, including 630A, 1250A, 1600A, 2000A, 2500A, 3150A, and 4000A options. The available short circuit breaking current ranges from 20kA to 40kA, allowing engineers to select a suitable solution according to system protection requirements.
Electrical parameters determine whether the breaker can meet the operating conditions of the power network. The product is designed for medium voltage applications with a rated voltage of 12kV and rated frequency of 50Hz.
The insulation performance includes a rated industrial frequency withstand voltage of 42kV and lightning impulse withstand voltage of 75kV, providing stable insulation capability under normal operating and transient conditions.
| Parameter | Specification |
| Rated Voltage | 12kV |
| Rated Frequency | 50Hz |
| Rated Current | 630A-4000A |
| Rated Short Circuit Breaking Current | 20kA-40kA |
| Mechanical Life | Up to 20000 operations |
| Energy Storage Time | ≤10s |
The Usune Fixed Vacuum Circuit Breaker adopts vacuum arc interruption technology to provide reliable switching performance for medium voltage systems.
The vacuum interrupter design helps achieve stable current interruption and electrical isolation while reducing the influence of external operating environments. This makes the breaker suitable for applications requiring consistent performance during long-term operation.
The mechanical structure is designed to support repeated closing and opening operations during service life. Special bearings, surface treatment technology, and long-life lubricating grease are applied to improve operating durability.
Although the breaker is designed to achieve maintenance-free operation theoretically, inspection is still recommended because operating environments and product configurations may vary. Regular examination helps ensure continued safety and reliability during service.
When selecting a circuit breaker structure, engineers usually consider installation requirements, maintenance methods, and project operating conditions.
| Comparison Item | Fixed Vacuum Circuit Breaker | Withdrawable Vacuum Circuit Breaker |
| Installation Method | Permanently installed inside cabinet | Can move between test and service positions |
| Structure | Simplified fixed design | Includes withdrawal mechanism |
| Cabinet Requirement | More straightforward cabinet integration | Requires additional mechanical space |
| Maintenance Access | Requires shutdown for removal | Easier equipment replacement |
| Suitable Project Type | Stable operation systems | Systems requiring frequent inspection |
For projects where equipment remains in a fixed position after installation, fixed configuration can provide a practical solution with simpler mechanical design and efficient cabinet integration.
For international electrical projects, product consistency and certification compliance are important factors during supplier selection.
Usune follows strict manufacturing procedures based on ISO 9001 quality management, ISO 14001 environmental management, and ISO 45001 occupational safety management systems. Products are designed according to IEC and GB standards and meet CE certification requirements to support global project applications.
Although the fixed breaker is designed for reliable long-term operation, regular inspection according to actual working conditions is recommended.
During maintenance planning, users should pay attention to surface contamination, moisture, corrosion, mechanical components, fastener conditions, and insulation performance. For equipment installed in dusty, humid, or corrosive environments, inspection frequency should be adjusted according to site conditions.
The technical requirements recommend checking structural components based on operating frequency to identify possible deformation caused by abnormal operation. Fasteners should also be inspected after a certain number of operating cycles to ensure secure mechanical connection.
When a breaker is stored for a long period or operated infrequently, moving components may experience resistance caused by inactivity.
To maintain operating flexibility, energy storage, closing, and tripping operations should be performed regularly. For frequently operated equipment, users should monitor operating times and avoid continued operation after exceeding the allowable service life of the vacuum interrupter or mechanical mechanism.
Before purchasing, customers should provide complete project information, including breaker model, quantity, rated voltage, rated current, short circuit breaking current, operating voltage, secondary wiring requirements, spare parts requirements, and other special technical conditions.
Providing accurate project details helps Usune recommend the correct fixed installation configuration and avoid installation or commissioning issues caused by parameter mismatch.
A fixed vacuum circuit breaker is mainly used in medium voltage switchgear systems where the breaker remains permanently installed and does not require frequent withdrawal operations.
Selection should be based on system voltage, current capacity, short circuit protection requirements, cabinet dimensions, and control configuration.
Usune provides multiple current options from 630A to 4000A to support different medium voltage power distribution requirements.
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No. 298, Wei 17th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou City, Zhejiang Province, China
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