1. High precision mechanical structure 2. High conductivity copper
Description
ZN73A-12series permanent magnet embedded poles type indoor vacuum circuit breaker is a three-phase AC 50Hz, rated voltage of 12kV indoor switchgear. I loaded the company with its own research and development of permanent magnetic actuator for industrial and mining enterprises, power generation and substation facilities as electrical control and protection purposes. The product has high reliability and long life characteristics, especially suitable for frequent operation, repeatedly breaking conditions, such as short-circuit current of the place.
Note: This models vacuum interrupter chamber seal replaced with ordinary insulation tube column installation method, the model ZN73A-12P.
Technical data
| NO | Item | Units | Parameters |
| 1 | Contact distance | mm | 11±1 |
| 2 | Contact travel | 3.5 ± 0.5 | |
| 3 | Three phase opening synchronism | ms | ≤2 |
| 4 | Contact closing spring time | ≤2 ≤3 (40kA) | |
| 5 | Phases center distance | mm | 210 275 |
| 6 | Closing contact pressure | N | 20kA 31.5kA 40kA 2000±200 3100±200 4500±200 |
| 7 | Leading electrical circuit resistance | μΩ | 60 45 30 |
| 8 | Average opening speed | m/s | 1.1 ±0.2 |
| 9 | Average closing speed | 0.7 ± 0.2 0.8 ± 0.2 | |
| 10 | Opening time | ms | 30~60 |
| 11 | Closing time | 50~100 | |
| 12 | Action Static Contact cumulative wear thickness allows | mm | 3 |
| NO | Item | Units | Parameters | |||
| 1 | Rated voltage | KV | 12 | |||
| 2 | Rated insulation level | 1 min Frequency voltage | KV | 75 | ||
| Rated Lightning Impulse voltage tolerance | 42 | |||||
| 3 | Rated current | A | 630~1250 | 1250~3150 | 1250~4000 | |
| 4 | Rated short-circuit breaking current | kA | 20 | 31.5 | 40 | |
| 5 | Rated short-circuit closing current (peak) | 50 | 80 | 100 | ||
| 6 | Dynamic Stability rated current(peak) | 50 | 80 | 100 | ||
| 7 | Rated thermal stability of current(RMS) | 20 | 31.5 | 40 | ||
| 8 | Rated short-circuit breaking current breaking number | Times | 30 | 30 | 20 | |
| 9 | Rated thermal stabilization time | S | 4 | |||
| 10 | Rated operating sequence | O-0.3s-CO-180s-CO | ||||
| 11 | Mechanical life | Times | ≥50000 ≥ 50000 ≥ 3000 | |||
| 12 | Permanent magnetic actuator and transmission part of the Mechanical life | ≥100000 ≥100000 ≥100000 | ||||
| 13 | Rated single capacitor breaking current | A | 630 | |||
| 14 | Rated back to back capacitor breaking current | 400 | ||||
| 15 | Rated breaking current-step | kA | 12.6 16 | |||
ZN73A-12 series electric breaker
