The 40.5KV Outdoor Vacuum Circuit Breakers VCB Breaker is a high-voltage switching and protection device designed for 40.5kV three-phase 50Hz power networks. Wzonpa, a leading China manufacturer, supplier and factory, delivers this solution for stable interruption of load current, overload current, and short-circuit current in demanding outdoor environments, ensuring reliable grid protection under severe operating conditions.
The 40.5KV Outdoor Vacuum Circuit Breakers VCB Breaker adopts advanced vacuum arc extinguishing technology and precision mechanical design to ensure long-term performance.
High breaking capacity with no external arc exposure, improving operational safety
Mechanical lifespan up to 10,000 operations for frequent switching environments
Strong insulation using epoxy resin casting and extended creepage distance
Optional spring or electromagnetic operating mechanism for flexible control needs
Built-in 0.2-level current transformer for accurate protection and metering signals
Intelligent anti-condensation system for stable outdoor performance
Temperature range: -25℃ to +40℃
Wind resistance: up to 34m/s
Altitude: ≤3000m without derating
Seismic resistance: up to intensity 8
Pollution level: Class III suitable
No explosive or strong corrosive environments required
The 40.5KV Outdoor Vacuum Circuit Breakers VCB Breaker made in China is widely used in substations, industrial and mining power distribution systems, rural grids, and renewable energy integration stations where stable switching performance is critical under frequent operations and harsh outdoor exposure.
Wzonpa applies strict quality control throughout production, from raw material selection to final testing. High-voltage withstand tests, mechanical endurance checks, and insulation verification are conducted to ensure compliance with international power equipment standards and long-term operational reliability.
Compared with conventional circuit breakers, Wzonpa solutions offer improved durability, reduced maintenance frequency, and enhanced environmental adaptability. The 40.5KV Outdoor Vacuum Circuit Breakers VCB Breaker provides superior arc control performance and higher operational stability in extreme conditions.
| SN | Item | Unit | Parameters | ||
| 1 | Rated voltage | KV | 40.5 | ||
| 2 | Rated insulated level | Power frequency withstand voltage | Dry-type | 95 | |
| Wet-type | 80 | ||||
| Lightning impulse withstand voltage(peak value) | 185 | ||||
| 3 | Rated current | A | 1250、 1600、2000 | ||
| 4 | Rated short-circuit breaking current | KA | 20、25、31.5 | ||
| 5 | Rated operating sequence | O-0.3s-CO-180s-CO | |||
| 6 | Rated short-circuit current breaking times | Times | 12 | ||
| 7 | Rated short-circuit closing current (peak) | KA | 50、63、80 | ||
| 8 | Rated peak withstand current | ||||
| 6 | Rated short-time withstand current | KA | 20、25、31.5 | ||
| 10 | Rated short-circuit continuous current | S | 4 | ||
| 11 | Average opening speed | m/s | 1.5±0.2 | ||
| 12 | Average closing speed | 0.7±0.2 | |||
| 13 | Contact closing bounce time | S | ≤2 | ||
| 14 | Three phase closing(opening)synchronization time difference | ≤2 | |||
| 15 | Closing time | ≤150 | |||
| 16 | Opening time | ≤60 | |||
| 17 | Mechanical lifespan | Times | 10000 | ||
| 18 | Rated operating voltage and rated voltage of auxiliary circuit | V | DC220、110、24 | ||
| AC220、110、24 | |||||
| 19 | DC resistance of each phase circuit(excluding transformers) | μΩ | ≤100 | ||
| 20 | Allowable wear thickness of dynamic and static contacts | mm | 3 | ||
| 21 | weight | kg | 800 | ||
Q1: What is the main function of this circuit breaker?
A1: It protects electrical systems by interrupting fault currents and ensuring safe operation of power distribution networks under overload or short-circuit conditions.
Q2: Can it be used in high-altitude areas?
A2: Yes, it is designed for stable operation up to 3000 meters without performance reduction.
Q3: What makes vacuum technology better?
A3: Vacuum interruption eliminates external arc risk, improving safety and extending service life.
Q4: How often does it require maintenance?
A4: With optimized design and long-life mechanism, maintenance intervals are significantly reduced compared to traditional equipment.
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No. 58 Binhainan Fourth Road, Economic Development Zone, Yueqing City, Wenzhou City, Zhejiang Province, China
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