Since 1991
ZN28G ZN28A-12 series indoor vacuum circuit breaker is a three-phase AC 50Hz,rated voltage of 12kV indoor witchgear ,
control and protection for industrial and mining enterprise,
power plants and substations,electrical acilities,
and for frequent operation place.
ZN28G Indoor High Voltage Vacuum Circuit Breaker
Summary
ZN28G ZN28A-12 series indoor vacuum circuit breaker is a three-phase AC 50Hz,rated voltage of 12kV indoor witchgear ,control and protection for industrial and mining enterprise,power plants and substations,electrical acilities,and for frequent operation place.
Model Implication
Specifications
| No. | Item | Units | Parameters | ||
| 1 | Rated voltage | kV | 12 | ||
| 2 | Rated cu rrent | A | 630-3150 | ||
| 3 | Rated short-circuit brea k1 ng current | KA | 20 | 31.5 | 40 |
| 4 | Rated sho rt-circuit closing current | KA | 50 | 80 | 100 |
| 5 | Rated dynamic steady electric current(peak) | KA | 50 | 80 | 100 |
| 6 | Rated therrnal stability cu rre nt (RMS) | KA | 20 | 31.5 | 40 |
| 7 | Rated thermal stability time | S | 4 | ||
| 8 | The breaking times of rated short circuit break i ng current | Times | 30（50） | ||
| 9 | Open time of CD10 electromagn etic operating mechanism | mS | <80 | ||
| 10 | Rated operating sequence | 0-0.3s-CO-180s-CO | |||
| 11 | A minute power frequen cy withstand voltage(RMS) | kV | The phase 42, section 148 | ||
| 12 | Lightning shock pressure | kV | The phase 75, section 85 | ||
| 13 | Mechanical life | Times | 10000 | ||
| 14 | Note: 20KA, 31.5KA t=0.3s t1=180s 40KA t=180s t1 =180s | ||||
Overall Dimensions
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