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General
ZN63A-12 (VS1) indoor high voltage vacuum circuit breaker is an indoor equipment of three phase AC 50Hz system with 12kV rated voltage. It is used in industrial and mining enterprises, power plants and substations for protection and control of electric equipment. It is specially suitable for the places of oil-free, less maintenance and frequent operation. It could be fitted in mid-mounted switchgear, two layer switchgear and fixed type switchgear.
Main technical data
No. | Name | Unit | Data | ||||
1 | Rated voltage | kV | 12 | ||||
2 | Rated frequency | Hz | 50 | ||||
3 | Rated lightning impulse withstand voltage (peak) | kV | 75 | ||||
4 | Rated 1min power frequency withstand voltage (rms) | kV | 42 | ||||
5 | Rated operating sequence |
| O-0.3s-CO-180s-CO | O-180s-CO-180s-CO | |||
6 | Rated current | A | 630, 1250 | 1250, 1600, 2000, 2500 | 1250, 1600, 2000, 2500, 3150 | 4000, 5000 | |
7 | Rated short-circuit breaking current | kA | 20/25 | 31.5 | 40 | 40/50 | |
8 | Rated short-circuit making current | kA | 50/63 | 80 | 100 | 120 | |
9 | Rated short-circuit duration | s | 4 | ||||
10 | Breaking times at rated short-circuit breaking current | time | 50 | 50 | 30 | 20 | |
11 | Mechanical life | time | 20000 | ||||