The CT68-12 vacuum circuit breaker adopts special contact material and interrupter with high breaking capacity and with very long electrical endurance.
The CT68-12 vacuum circuit breaker has simple structure, high breaking capacity, long endurance, all-round operating functions, no explosive danger and convenient maintenance. It is fit to control transport system and protect switch in powerhouse and transformer substation, especially fit to break important load or frequent operations in some places.
Applying Ambient Conditions
1.Height above sea level: not exceed 1000M.
2.Circumstance humidity: max +40°C, min -25°C.
3.Relative humidity: daily average <95%, monthly average≤90%.
4.Earthquake intensity: Degree 9.
5.Installation place: no fire, no explosive danger, no serious corrosion, and no frequent tense vibration.
| No. | Item | Unit | Data | |||||
| 1 | Rated voltage | KV | 12 | |||||
| 2 | Rated insulation level |
Short-time power frequency withstand voltage (1min) | KV | 42 | ||||
| Lightning impulse withstand voltage (peak) | KV | 75 | ||||||
| 3 | Rated frequency | Hz | 50 | |||||
| 4 | Rated current | A | 630 1250 |
1250 1600 2000 2500 3150 |
1250 1600 2000 2500 3150 4000 |
|||
| 5 | Rated short-circuit breaking current (effective value) | KA | 20 | 25 | 31.5 | 40 | 50 | |
| 6 | Rated short-circuit withstand current | KA | 20 | 25 | 31.5 | 40 | 50 | |
| 7 | Rated short circuit duration | s | 4 | |||||
| 8 | Rated peak withstand current | KA | 50 | 63 | 80 | 100 | 125 | |
| 9 | Rated short-circuit making current | KA | 50 | 63 | 80 | 100 | 125 | |
| 10 | Rated short-circuit breaking times | times | 50 | 30 | 20 | |||
| 11 | Secondary circuit power frequency withstand voltage (1min) | V | 2000 | |||||
| 12 | Rated single capacitor bank breaking current | A | 630 | 800 | 800 | |||
| 13 | Rated back-to-back capacitor bank breaking current | A | 400 | |||||
Below drawing is for CT68-12/3150-40-275, for reference
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