Online Service:
1.high voltage of three phase alternting current 50hz, 12kv.
2 CB1984-89 and IEC-56 << alternating currenthigh
ZN28 (A) - 12 series vacuum circuit breaker is rated voltage 12 kv, three-phase ac fifty hz high indoor switchgear. This product conforms to the GB1984-89 standard, this product structure for switch body and operation mechanism one installation and switch body and operation mechanism separation installation two forms. One-piece mechanism is the basic ZN28, split mechanism for ZN28A - 12 type, suitable for all kinds of stationary switch cabinet.
This product can be with CD17, CD10A type dc electromagnetic operating mechanism and CT17 CT19 type spring-storing type, operation mechanism.
| NO | Item | unit | Information | ||||
| 20KA | 25KA | 31.5KA | 40KA | ||||
| 1 | rated voltage | KV | 12 | ||||
| 2 | higest working voltage | A | 630.125 | 1250.16 | 1250.1600.2000.2500 | 1600.2500.3150 | |
| 3 | rated breaking current for short-circuit | KA | 20 | 25 | 31.5 | 40 | |
| 4 | Rated short circuit switching current (peak) | KA | 50 | 63 | 80 | 100 | |
| 5 | rated peak withstand current | KA | 50 | 63 | 80 | 100 | |
| 6 | rated withstand current for short-circuit in 4 mins | KA | 20 | 25 | 31.5 | 40 | |
| 7 | rated insulated level | frequency withstand (before and after rated breaking and closing ) | KV | 42(48) | |||
| impact (before and after rated breaking and closing ) | 75(84) | ||||||
| 8 | rated operational | breaking -0.35-closing breaking 180s-closing breaking | |||||
| 9 | lifetime | Times | 10000 | ||||
| 10 | breaking times for rated current in short-circuit | Times | 30 | 20 | |||
| 11 | clearance between open contacts | mm | 11±1 | ||||
| 12 | overtravel | mm | 4±1 | ||||
| 13 | three phaseclosing and breaking | ms | ≤2 | ||||
| 14 | Contact switching bounce time | ms | ≤2 | ||||
| 15 | average breaking speed | m/s | 1.2±0.3 | ||||
| 16 | average closing speed | m/s | 0.6±0.2 | ||||
| 17 | time for breaking | under highest operational volatge | s | ≤60 | |||
| under lowest operational volatge | ≤80 | ||||||
| 18 | time for closing | s | ≤100 | ||||
| 19 | Single-phase circuit resistance | u Ω | ≤45 | ≤25 | |||
| 20 | Static head accumulated allow wear thickness | mm | 3 | ||||
| 21 | The oil buffer buffer stroke | mm | 10 | ||||
English 
中文
España
Pусский
Portugues
