Wzonpa factory’s 11KV Vacuum Circuit Breakers Vacuum CKT Breaker is an indoor medium-voltage switching device designed for 12kV, 50Hz three-phase power systems. It is used for protection and control in distribution networks, offering reliable interruption of load current, short-circuit current, and capacitor bank switching. As a China manufacturer, Wzonpa develops this product with standardized VS1-12 side-mounted structure, making it suitable for integration into various switchgear systems. As a professional supplier and factory source, Wzonpa provides consistent design compatibility for industrial, commercial, and utility power applications.
The 11KV Vacuum Circuit Breakers Vacuum CKT Breaker adopts a fixed installation, side-mounted VS1-12 structure, mainly used in fixed switchgear cabinets.
Main components include:
Vacuum interrupter chamber (core breaking unit)
Spring energy storage operating mechanism (manual or electric)
Three-phase conductive system
Insulation support structure and frame assembly
This configuration supports stable operation under frequent switching conditions and ensures compatibility with ring main units (RMUs), box-type substations, and customized distribution systems.
This hot sale 11KV Vacuum Circuit Breakers Vacuum CKT Breaker is widely used in medium-voltage distribution and control systems across multiple industries.
Typical applications:
Industrial and mining power distribution systems
Commercial building electrical networks
Substations and utility grid systems
Renewable energy grid integration points
As a vacuum circuit breaker supplier solution in China, Wzonpa 11KV Vacuum Circuit Breakers Vacuum CKT Breaker is suitable for transformer protection, feeder circuits, motor control, and capacitor switching operations. It can be integrated into standard switchgear panels and non-standard power distribution systems.
This equipment is designed for indoor medium-voltage environments with controlled installation conditions.
Operating conditions:
Ambient temperature: -15°C to +40°C
Altitude: ≤1000 m (higher altitude requires insulation adjustment)
Relative humidity: daily ≤95%, monthly ≤90%
Seismic intensity: ≤ Level 8
Environment: no explosive gas, chemical corrosion, or severe pollution
The design ensures reliable performance in typical distribution environments such as substations and industrial facilities.
The breaker is engineered for stable mechanical coordination and fast switching response.
Key operational features:
Contact opening distance: 11 ± 1 mm
Average opening speed: 1.1 ± 0.2 m/s
Average closing speed: 0.6 ± 0.2 m/s
Opening time: ≤0.1 s
Phase difference during operation: ≤2 ms
Main circuit resistance: ≤60 μΩ
These parameters support consistent switching behavior and long mechanical endurance in repeated operations.
| SN | Item | Unit | Parameter | ||||
| 1 | Rated voltage | kV | 12 | ||||
| 2 | Rated frequency | Hz | 50 | ||||
| 3 | Rated current | A | 630~1250 | 1250 | 1250 | ||
| 4 | Rated short-circuit breaking current | kA | 20 | 25 | 31.5 | ||
| 5 | Rated short-circuit making current | kA | 50 | 63 | 80 | ||
| 6 | Rated short-circuit making current(peak) | kA | 50 | 63 | 80 | ||
| 7 | 4S rated short-circuit withstand current | kA | 20 | 25 | 31.5 | ||
| 8 | Rated insulated level | Power frequency withstand voltage (before and after rated breaking) Impact withstand voltage(before and after rated breaking) | kA | 42(fracture 48) | |||
| 75(fracture 85) | |||||||
| 9 | Rated operating sequence | O-0.3S-CO-180S-CO | |||||
| 10 | Mechanical lifespan | Times | 10000 | ||||
| 11 | Rated short-circuit breaking current breaking times | Times | 50 | ||||
| 12 | Rated closing voltage of operating mechanism(DC) | V | 110,220 | ||||
| 13 | Rated opening voltage of operating mechanism(DC) | V | 110,200 | ||||
| 14 | Contact opening distance | mm | 11±1 | ||||
| 15 | Overtravel(compression length of contact spring) | mm | 3.5±0.5 | ||||
| 16 | Three phase opening and closing bounce time | ms | ≤2 | ||||
| 17 | Contact closing bounce time | ms | ≤2 | ||||
| 18 | Average opening speed | m/s | 1.1±0.2 | ||||
| 19 | Average closing speed | m/s | 0.6±0.2 | ||||
| 20 | Opening time | Under the highest operating voltage | ≤0.05 | ||||
| At the lowest operating voltage | s | ≤0.08 | |||||
| 21 | Closing time | s | 0.1 | 50 | |||
| 22 | Main circuit resistance of each phase | uΩ | 60 | ||||
| 23 | Allowable wear and accumulated thickness of dynamic and static contacts | mm | 3 | ||||
Q1: What systems can this vacuum circuit breaker be used in?
A: The 11KV Vacuum Circuit Breakers Vacuum CKT Breaker is suitable for 12kV distribution systems, including substations, RMUs, industrial networks, and compact substations.
Q2: Can it handle frequent switching operations?
A: Yes. The vacuum interrupter and spring mechanism design support repeated operation under rated current conditions.
Q3: What installation type is used?
A: It uses a fixed, side-mounted VS1-12 structure designed for indoor switchgear panels.
Q4: Is it suitable for outdoor use?
A: This model is designed for indoor environments. Outdoor use requires additional protective enclosure systems.
Address
No. 58 Binhainan Fourth Road, Economic Development Zone, Yueqing City, Wenzhou City, Zhejiang Province, China
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