1. 12kvcircuit breaker
2. IEC standard
3.Reliable
4.Long service life,
5.Short delivery time
ZN28(A)-12 series vacuum circuit breaker is a kind of 12kv,50Hz three phase current high voltage indoor switch device. It sticks to the stander of GB1984-89.It can be mounted together with the operating structure as a whole and also can be separated.ZN28-12(integrated structure) and ZN28A(segregated structure) can be applied to various kinds of fixed switchgear, such
as GG-1A(Z),XGN2-12A(Z).This product can matches to CD17 direct current electromagnetic operating structure and CT17,CT19 spring operating structure.
Ambient condition
1 Ambient temperature: max +40°C min -15°C(conveyance under -30°C is allowed)
2 Altitude: ≤1000m
3 Relative humidity: daily average relative humidity: ≤95%; monthly average relative humidity≤90%, daily average saturated vapor pressure ≤2.2*10-3 MPa,monthly average value ≤1.8*10-3 MPa
4 Earthquake intensity: ≤8 degree
5 The installation should be free from fire, explosion, severe vibration, chemical corrosion and serious pollution
Order instruction
Complete model and order quantity of the product
Rated current and rated voltage
Rated short circuit breaking current, operation voltage
Required accessory and quantity
Other requirement please contact with us directly
| Main Technical Data | |||||
| Rated voltage | kv | 12 | |||
| Rated lighting impulse withstand voltage(peak) | kv | Interphase or to ground 75,fructure 80 | |||
| Rated short-time power frequency withstand voltage(1min) | kv | Interphase or to ground 42,fructure 48 | |||
| Rated short-circuit breaking current | kA | 20 | 25 | 31.5 | 40 |
| Rated current | A | 630/1250 | 630/1250 | 630/1250/1600/2000 | 1250/2000/ 3150/4000 |
| Rated thermostability current(valid) | kA | 20 | 25 | 31.5 | 100 |
| Rated dynamic stability current(peak) | kA | 50 | 63 | 80 | 100 |
| Rated short-circuit making current(peak) | kA | 50 | 63 | 80 | |
| Rated operations of short-circuit breaking current interruption | times | 30(40kA is 20) | |||
| Contact erosion limit | mm | 3 | |||
| Rated operating sequence | 0-0.3-CO-180s -CO | ||||
| Rated contact stroke | mm | 11±1 | |||
| Contact overtravel | mm | 4±1 | |||
| Closing time | ms | ≤200 | |||
| Opening time | ms | ≤60 | |||
| Oil buffer cushion overtrale | mm | 10 | |||
| Resistance of each main ciucuit | μΩ | ≤40 | ≤20 | ||
| Mechanical life | times | 10000 | |||
