Model：VITD12/1250-25
Category：VI for outdoor circuit breakers
| Main Technical Parameter | ||
| Rated voltage | 12kV | |
| Rated current | 1250A | |
| Rated frequency | 50Hz | |
| Rated short-time Power frequency withstand voltage | 42kV | |
| Rated lightning impulse withstand voltage | 75kV | |
| Rated short-circuit breaking current | 20/25kA | |
| Rated short-circuit making current(peak) | 50/63kA | |
| Breaking operations of rated short circuit breaking current | 30 times | |
| Rated breaking current of single capacitor bank | 400A | |
| Rated short-time withstand current | 20/25kA | |
| Rated peak withstand current | 50/63kA | |
| Rated duration of short-circuit | 4 s | |
| Mechanical endurance | 10000 times | |
| Closing force due to bellow and atmosphere | 70±40N | |
| Force required to hold contacts open at full storke | 120±50N | |
| Circuit resistance at lowest rated contact force | ≤30μ? | |
| Storage life | 20 years | |
| Contacts limit erosion | 3mm | |
| Weight of movable parts | ≤0.7 kg | |
| MECHANICAL DATA REQUIRED FOR THE MATCHED VACUUM SWITCHGEAR | ||
| Clearance between open contacts | 9±1 mm | |
| Contact connection stroke | 3.5±0.5mm | |
| Average opening speed(average of 75% contact gap) | 1.0±0.25m/s | |
| Average closing speed(average of last 30% contact gap) | 0.65±0.15m/s | |
| Rated added extemal contact final force | 1600±100N | |
| Contact bouncing duration at closing operation | ≤2 ms | |
| Closing and opening non-simultaneity of three-phase contacts | ≤1 ms | |
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