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Help CenterZN28A-12 Series Indoor AC Medium-voltage Vacuum Circuit Breaker
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Specifications
1.Voltage: 12KV2.Max.Current: 3150A
3.For breaking or closing load and over-load current
4.Fuse can be allocated
ZN28A-12 Series Indoor AC Medium-voltage Vacuum Circuit Breaker
Product Features
As indoor AC medium voltage apparatus for rated voltage of 12kV and three-phase 50Hz, the ZN28A-12 Series indoor AC high voltage vacuum circuit-breaker mainly serves in the stationary switchgear or replaces oil-minimum circuit-breaker inside backward switchgear, and can be used inside removable switchgear as well. The circuit-breaker can function as protection and control device for electrical equipment in mineral & industrial nterprise, power plant and substation and the occasions featuring frequent operation. The circuit-breaker conforms to the standards of GB1984 Alternate current high-voltage circuit breaker, JB3855 Indoor alternate current high-voltage vacuum circuit breaker for rated voltage from 3.6kV to 40.5kV and DL/T403. Ordering specifications for indoor high-voltage vacuum circuit breaker for rated voltage from 12kV to 40.5kV.
Normal Service Conditions
1. Ambient temperature: -15~+40(storage and transport permissible at-30)
2. Relative humidity:
Daily average value is not more than 95%;
Monthly average value is not more than 90%.
3. Altitude: 2000m and below (for high altitude type is 2500m)
4. Earthquake intensity: No more than degree 8
5. No operating in such position as subject to fire danger, explosion risk, severe pollution, chemical corrosion and violent vibration.
Type Meaning
Technical Parameter
Number |
Item |
Unit |
Reference |
|||
1 |
Rated voltage |
KV |
12 |
|||
2 |
Rated frequency |
HZ |
50 |
|||
3 |
Rated insulation level |
1minPower frequency withstand voltage |
KV |
42 |
||
Thunder impulse withstand voltage(peak value) |
75 |
|||||
4 |
Rated current |
A |
630;1250;1600 |
1250;1600;2000 |
2000;2500;3150 |
|
5 |
Rated short-circuit close current(peak value) |
KA |
20 |
31.5 |
40 |
|
6 |
Rated operation order |
off--0.3s on and off--180S-on and off |
||||
7 |
Rated short-circuit Breaking current times |
times |
30(50) |
30(50) |
20(30) |
|
9 |
Rated Impulse withstand voltage |
KA |
50 |
80 |
100 |
|
10 |
4S Heat steady e.c.A |
20 |
31.5 |
40 |
||
11 |
all opened and broke time |
ms |
≤100 |
|||
12 |
Mechanical life-span |
times |
10000 |
|||
Dimension and mounting
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