- Model NO.: ZN28-12K
- Operation: Electric Type
- Arc-extinguishing Medium: Vacuum
- Structure: ACB
- Type: Circuit Breaker
- Certification: VDE, ISO9001-2000, CE, CB, CCC
- Rated Current: 630/1250/1600/2000/2500/3150A
- Trademark: Longxiang Electric
- Specification: IEC: M2-E2-C2
- HS Code: 85389000
- Breaking Capacity: High Voltage Circuit Breakers
- Speed: High-Speed Circuit Breaker
- Installation: Fixed
- Poles Number: 3
- Function: Circuit-Breaker Failure Protection
- Rated Voltage: 12kv
- Rated Frequency: 50/60Hz
- Transport Package: Non-Solid Wooden Case for Export Shipment
- Origin: China Baoji
ZN28A-12 fixed type indoor HV vacuum breaker is used for many kinds of switchgear like XGN2-12(Z).It is widely used for 12kV voltage systems which is accordance with GB1984-2003 standards Structural characteristics:
1.This vacuum circuit breaker adopts air insulation ,it can meet air distance and creepage under nomal run condition.
2.The operating mechanism can use CD17or CT19 type mechanism,the outlet curve has good adaptation for the requirements of vacuum interrupters.It has high reliable with characteristic of long life and easy maintenance.
3.Convenient for matching with switchgear;convenient and reliable operation:compulsive mechanical interlock way is adopted:meet the "Five Preventions"function.
Applying ambient conditions
2.The height above sea level:≤1000m(besides the special requirements).
3.Relative humidity:the average humidity of a day should be no more than 95%;the average humidity of a month should be no more than 90%.
4.Saturated vapor pressure:the average pressure of a day should be no more than 2.2kPa:the average pressure of a month should be no more than 1.8kPa.
5.Earthquake intensity:not exceed 8 degrees.
6.It should be installed in the places without fire,explosion,serious filth, chemical erosion and violent vibration.
Main Technical Specification
|4||Rated short circuit breaking current||kA||20||25||31.5||40|
|5||Rated peak withstand current||kA||50||63||80||100|
|6||Rated short-circuit duration||s||4|
|7||Rated power frequency withstand voltage||Between phases,|
phase to ground
|8||Rated lightning impulse withstand voltage||Between phases,|
phase to ground
|9||Rated operating sequence||O-0.3s-CO-180s-CO|
|10||Rated source voltage of opening and closing circuit||V||~220/-110;-220/110|
|11||Rated breaking current of single capacitor bank||A||630|
|12||Rated breaking current of bank to bank capacitor bank||A||400|
|13||Electrical endurance class||Cycle||30|
|15||Operating mechanism type||CD17I||CD17II||CD17II||CD17III|
|16||Clearance between open contacts||mm||11±1|
|17||Contact stroke of contacts||mm||4±1|
|18||Out simultaneity of CO operation of three poles||ms||≤2|
|19||Contact bouncing duration at closing operation||ms||≤2|
|22||Average closing speed||m/s||0.6±0.2|
|23||Average opening speed||m/s||1.1±0.2|
|24||Main circuit resistance of each pole||μΩ||≤40||≤40||≤40||≤30|
Overall outline drawing