It is applicable to making and breaking load of various character and also for frequent operation in power systems of 3-phase.
ZN73-12 AC high-voaltage indoor vacuum circuit breaker is applicable to making and breaking load of various character and also for frequent operation in power systems of 3-phase, AC 50Hz and with rated voltage of 12 KV. It can be used for protecting and controlling of electrical equipment in industrial plants, mines, power generation plants and substations.
Main technical data
No. | Name | Unit | Data | |
1 | Rated voltage | kV | 12 | |
2 | Rated insulation level | 1min power frequency withstand voltage | kV | 42 |
Lightning impulse withstand voltage | 75 | |||
3 | Rated frequency | Hz | 50 | |
4 | Rated current | A | 630, 1250, 1600 | |
5 | Rated switching single back-to-back capacitor bank current | A | 630/400 | |
6 | Rated short-circuit breaking current | kA | 20, 25, 31.5, 40 | |
7 | Rated short time withstand current (4s) | kA | 20, 25, 31.5, 40 | |
8 | Rated peak withstand current | kA | 63, 80, 100 | |
9 | Rated short-circuit making current (peak) | kA | 63, 80, 100 | |
10 | Rated making capacitor bank inrush current | kA | 12.5 (frequency less than 1000Hz) | |
11 | Rated operating sequence | O-0.3s-CO-180s-CO | ||
12 | Closing time | ms | ≤100 | |
13 | Opening time | ms | ≤60 | |
14 | Arcing time | ms | ≤15 | |
15 | Breaking times at rated short-circuit breaking current | time | 30 | |
16 | Mechanical life | time | 20000 | |
