Original
By certification 
VCB vacuum circuit breaker
ZN28A-12 series of rated voltage 12/40.5 kV vacuum circuit breaker, three-phase ac 50 hz indoor high voltage switch equipment, is the introduction of Germanys Siemens technology products. The structure of circuit breaker Simple open circuit ability, long service life, operating function is all ready, no explosion danger, convenient maintenance, suitable for power plant, substation and other electric power transmission and distribution system of control or protection switch, especially in open circuit important place of load and frequent operation. Our products comply with GB1984-89 standard for ac high voltage circuit breaker.
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 |
|||
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