Overview
VB85 33 indoor high voltage vacuum circuit breaker is a new developed product JiaJi electric co., LTD., mainly for the rated voltage 40.5 kV, three-phase ac 50 hz, power system for industrial and mining enterprises, power plants and transformer substation protection and control, especially suitable for frequent operation. Conformity with GB11022 "high voltage switch equipment and control equipment standards of common technical requirements, GB1984 ac high voltage circuit breaker and IEC56 high voltage circuit breaker and other standards.
Service Condition
Ambient temperature: not higher than +40 °C, not less than -10°C (at -30 °C to allow storage and transportation).Altitude: not exceed 1000m.
Relative humidity: daily average of not more than 95%,saturated vapor pressure on the average of not more than 2.2 × 10-3MPa, On average not more than 1.8 × 10-3MPa.
Earthquake intensity: not more than eight.
No fire, explosion hazard, serious filthy, chemical corrosion, as well as places of intense vibration.
Technical Parameters
| Item | Description | Unit | Data | |
| 1 | Rated voltage | KV | 40.5 | |
| 2 | Max. voltage | KV | 40.5 | |
| 3 | Rated current | A | 1250/1600/2000/2500/3150 | |
| 4 | Rated break current on shorting | KA | 31.5/40/50 | |
| 5 | Rated short circuit making current | KA | 80/100/125 | |
| 6 | Rated peak withstand current | KA | 80/100/125 | |
| 7 | 4S Rated withstand current | KA | 31.5/40/50 | |
| 8 | Rated insulation level | Power frequency voltage(when losing a circuit) | KV | Dreaker 48 |
| Impulse withstand voltage(when losing a circuit) | Dreaker 84 | |||
| 9 | Rated operating sequence | OC-0.3s-CO-180S-CO | ||
| 10 | Mechanical life | Times | 10000 | |
| 11 | Open circuit times of rated short dropout current | Times | 50 | |
| 12 | Rated close brake voltage of operating machnie | V | 110,220 | |
| 13 | Rated break brake voltage of operating machnie | V | 110,220 | |
| 14 | Clearance between open contacts | mm | 11±1 | |
| 15 | Exceed range(the compress length of contact sping) | mm | 4±0.5 | |
| 16 | Different period of three-phase break and close break | ms | ≤2 | |
| 17 | The jump time of contact close break | ms | ≤2 | |
| 18 | Average break speed | m/s | 0.9~1.2 | |
| 19 | Average closing speed | m/s | 0.6~1.2 | |
| 20 | Opening time | Ubder max.operating voltage | S | ≤0.05 |
| Under min.operating voltage | ≤0.08 | |||
| 21 | Closing time | s | ≤0.1 | |
| 22 | Resistance of each phase main loop | μΩ | ≤40 | |
| 23 | Contacts limit ersion | mm | 3 | |
