ZN63A-12 Vacuum Circuit Breaker | 12kV Indoor Fixed Type VS1 VCB
ZN63A-12 (VS1) Indoor High-Voltage Vacuum Circuit Breaker A reliable 12kV, 3-phase A.C. 50Hz indoor power distribution unit. This air-insulated VD4/VS1 type breaker is designed for power plants, substations, and industrial grids, meeting the high-performance standards of M2-E2-C2.Small size and compact structure for easy integration into various switchgear like KYN28.Long service life with stable performance, reaching the M2-E2-C2 high-performance grade.High degree of component generalization and standardized inventory for simplified maintenance.Optimized transmission efficiency and refined mechanical design.
ZN63A-12 Vacuum Circuit BreakerProduct Overview
The ZN63A-12 (VS1) series is a high-performance indoor vacuum circuit breaker (VCB) designed as three-phase A.C. 50 Hz power distribution equipment with a rated voltage of 12kV. It is widely used for protecting and controlling electrical equipment in power plants, substations, and industrial/mining enterprises. This air-insulated VD4/VS1 type breaker conforms to national and international IEC standards, reaching a high-capability grade of M2-E2-C2.
Main Features and Benefits
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Integrated & Modular Design: Adopts an integrated and miniaturized design for high transmission efficiency and compact installation within switch cabinets like KYN28.
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Excellent Reliability: Engineered for long life and stable performance, ensuring safety in frequent operational environments.
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Solid/Air Insulation Options: Available in air-insulated or composite insulation designs to meet specific dielectric strength requirements.
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High Standardization: Features standardized parts and modular integrated spring operating mechanisms, making it easy to maintain and manage inventory.
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Safety Assurance: Meets “Five-Prevention” requirements, protecting the arc extinguisher from dust, moisture, and accidental collision.
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Long Mechanical Life: Designed for high-cycle environments with a mechanical life of up to 30,000 operations.
Technical Specifications
| Technical parameters | Unit | Data |
| Rated voltage | kV | 12 |
| Rated current | A | 630 / 1250 / 1600 / 2000 / 2500 / 3150 / 4000 |
| Rated frequency | Hz | 50 |
| 1min PF pressure resistance | kV | 42 |
| Lightning impulse withstand voltage | kV | 75 |
| Short circuit breaking current | kA | 20 / 25 / 31.5 / 40 / 50 |
| Rated short circuit duration | s | 4 |
| Mechanical life | operations | 30,000 |
| Rated operating sequence | – | O-0.3s-CO-180s-CO |
Application Environment
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Ambient temperature: -10°C to +40°C.
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Altitude: ≤1000 meters.
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Relative humidity: daily average ≤95%; monthly average ≤90%.
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Earthquake intensity: No more than 8 degrees.
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Environment: Suitable for places without fire, explosion hazards, heavy pollution, chemical corrosion, or severe vibration.
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