ZN28A-12 Indoor high voltage vacuum circuit breaker
Usage Environment
◆The ambient temperature should not be higher than +40℃ and not lower than -10℃ (storage and transportation at -30℃ is allowed);
◆Altitude is not more than 1000m;
◆The daily average relative humidity of the air shall not exceed 95%, and the monthly average shall not exceed 90%. The daily average saturated vapor pressure shall not exceed 2.2x10-3MP0, and the monthly average shall not exceed 1.8x10-3MP0;
◆The earthquake intensity does not exceed 8 degrees;
◆No place subject to fire, explosion, serious pollution, chemical corrosion and severe vibration.
Technical Parameters
|
Serial number |
Project |
Unit |
Parameter |
||||
|
20kA |
25kA |
31.5kA |
40kA |
||||
|
1 |
Rated voltage |
kV |
12 |
||||
|
2 |
Rated current |
A |
630.1000.1250 |
1250.1600 |
1250.1600.2000.2500 |
1600.2000.2500.3150 |
|
|
3 |
Rated short-circuit breaking current |
kA |
20 |
25 |
31.5 |
40 |
|
|
4 |
Rated short-circuit breaking current( peak value) |
kA |
50 |
63 |
80 |
100 |
|
|
5 |
Rated peak withstand current |
kA |
50 |
63 |
80 |
100 |
|
|
6 |
4S Rated short-time withstand current |
kA |
20 |
25 |
31.5 |
40 |
|
|
7 |
Rated insulation level |
1min power frequency withstand voltage |
kV |
To ground 42 (break 48) |
|||
|
Lightning impulse withstand voltage (peak value) |
To ground 75(break 85) |
||||||
|
8 |
Rated operating sequence |
|
Open-0.3S-Close Open-108S-Close Open |
||||
|
9 |
Mechanical life |
Second-rate |
10000 |
||||
|
10 |
Rated short-circuit breaking current breaking times |
Second-rate |
30 |
20 |
|||
|
11 |
Rated closing voltage of operating mechanism (DC) |
V |
220/110 |
||||
|
12 |
Rated closing current of operating mechanism (DC) |
A |
90/180 |
128/256 |
145/290 |
||
|
13 |
Rated trip voltage of operating mechanism (DC) |
V |
220/110 |
||||
|
14 |
Rated trip voltage of operating mechanism (DC) |
A |
1.9/3.8 |
||||
|
15 |
Contact opening distance |
mm |
11±1 |
||||
|
16 |
Overtravel (contact spring compression length) |
mm |
4±1 |
||||
|
17 |
Different phases of three-pole closing and opening |
ms |
≤2 |
||||
|
18 |
Contact closing bounce time |
ms |
≤2 |
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