Product Overview
The ZN12-12 (ZN68-12) series vacuum circuit breakers are indoor high-voltage switching devices designed for three-phase AC systems with a rated voltage of 12kV and a frequency of 50Hz. They are manufactured using technology introduced from Siemens AG, Germany. These breakers feature high power performance, can be operated by AC or DC power sources, as well as manually. They are suitable for control and protection in power transmission and distribution systems such as power plants and substations, and are particularly well-suited for switching important loads and applications requiring frequent operation.
The ZN12-40.5 vacuum circuit breaker can serve as the main switching device compatible with switchgear series such as XGN17-40.5, KYN1-35, and GBC-35. The breaker is installed on a truck within the switchgear, functioning as a removable unit. Simultaneously, the breaker can also be fixed-mounted inside XGN17-40.5 switchgear. This breaker integrates the mechanism and switch into one unit: it employs a dedicated spring-energy storage operating mechanism, which can be charged using AC or DC power, and also allows for manual operation.
Technical Specifications
|
S.Q. |
Item |
Unit |
Parameter |
||||
|
I |
II |
III |
I |
II |
|||
|
1 |
Rated Voltage |
kv |
12 |
12 |
12 |
40.5 |
40.5 |
|
2 |
Rated Current |
A |
1250 |
1600 |
2000 |
1600 |
2000 |
|
3 |
Rated Short-Circuit Breaking Current |
KA |
31.5 |
31.5 |
31.5 |
25 |
31.5 |
|
4 |
Rated Operating Sequence |
O-0.3s-CO-180s-CO |
|||||
|
5 |
Rated Lightning Impulse Withstand Voltage (Full Wave) |
KV |
75 |
185 |
|||
|
6 |
Rated Short-Duration Power-Frequency Withstand Voltage (1min) |
KV |
42 |
95 |
|||
|
7 |
Closing Time |
ms |
≤75 |
50~85 |
|||
|
8 |
Opening Time |
ms |
≤60(50) |
40~85 |
|||
|
9 |
Mechanical Endurance |
次 |
20000(1~1V)10000(V~X) |
120000 |
|||
|
10 |
Rated Number of Operations at Rated Current |
次 |
20000(1~1V)10000(V~X) |
≥10000 |
|||
|
11 |
Motor Power for Spring Charging |
W |
275 |
275 |
|||
|
12 |
Rated Voltage of Motor for Spring Charging |
V |
AC/DC 110,220 |
AC/DC 220,110 |
|||
|
13 |
Spring Charging Time |
S |
≤75 |
≤15 |
|||
|
14 |
Rated Voltage of Closing Coil |
V |
AC/DC 110,220 |
AC/DC 220,110 |
|||
|
15 |
Rated Voltage of Opening Coil |
V |
AC/DC 110,220 |
AC/DC 220,110 |
|||
|
16 |
Rated Voltage of Energized Shunt Release |
V |
AC/DC 110,220 |
AC/DC 220,110 |
|||
|
17 |
Rated Voltage of Closing Interlock Device |
V |
AC/DC 110,220 |
AC/DC 220,110 |
|||
|
18 |
Rated Voltage of Undervoltage Release |
V |
AC/DC 110,220 |
AC/DC 220,110 |
|||
|
19 |
Rated Current of Overcurrent Release |
A |
5 |
5 |
|||
|
20 |
Rated Current of Auxiliary Switch |
A |
AC10 DC 10 |
DC 10 |
|||
|
21 |
Contact Travel |
mm |
11±1 |
20±2 |
|||
|
22 |
Contact Overtravel |
mm |
8±2 |
5±1 |
|||
|
23 |
Closing Speed |
m/s |
0.6~1.8 |
0.8~1.4 |
|||
|
24 |
Opening Speed |
m/s |
1.0~1.8 |
1.1~1.8 |
|||
|
25 |
Resistance per Phase |
μΩ |
≤35 |
≤45 |
|||
Model Designation
Z N 12 - 40.5 / □ - □
Z -- Vacuum Circuit Breaker
N -- Indoor
12 -- Design Serial Number
40.5 -- Rated Voltage (kV)
□ -- Rated Current (A)
□ -- Rated Short-Circuit Breaking Current (kA)
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