ZN73A-12 indoor high voltage permanent magnet vacuum circuit breaker is suitable for three-phase, AC50Hz with 12KV rated voltage. It can provide control and protection for industrial and mining enterprises, power plants and substations, and electrical facilities. Equipped with permanent magnet operating mechanism developed by our company. For its high reliability and long life, it is especially suitable for the places with bad conditions for example under frequent operation and frequent breaking of short circuit current.
Item | Description | Unit | Data |
1 | Rated voltage | KV | 12 |
2 | Max. voltage | KV | 12 |
3 | Rated current | A | 630/1250/2500 |
4 | Rated short circuit breaking current | KA | 20/25/31.5 |
5 | Rated short circuit making current | KA | 50/63/80 |
6 | Rated peak withstand current | KA | 50/63/80 |
7 | 4S Rated withstand current | KA | 20/25/31.5 |
8 |
Rated insulation level
| Power frequency voltage(when losing a circuit) | KV | Dreaker 65 |
Impulse withstand voltage(when losing a circuit) | Dreaker 125 |
9 | Rated operating sequence |
| OC-0.3s-CO-180S-CO |
10 | Mechanical life | Times | 20000 |
11 | Rated short circuit current breaking time | Times | 274 |
12 | Rated close brake voltage of operating machnie | V | 110,220 |
13 | Rated break brake voltage of operating machnie | V | 110,220 |
14 | Contact stroke | mm | 13±1 |
15 | Exceed range(the compress length of contact sping) | mm | 3.5±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 | 1.1~1.7 |
19 | Average closing speed | m/s | 0.6~1.1 |
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 | 630≤50 1250≤45/ 1600-2500≤40 |
23 | Contacts limit ersion | mm | 3 |
Russian