Product Overview
The FKN12-12D/630-20 indoor high-voltage isolating switch (hereinafter referred to as the FKN-12D load switch) is a three-phase high-voltage device with a rated voltage of 12 kV and a frequency of 50 Hz, used for splitting load current, closed-loop current, no-load transformer and cable charging current, and for closing short-circuit current. This indoor high-voltage isolating switch can be equipped with a grounding switch to withstand short-circuit conditions.
The FKN12-12R.D/125-31.5 indoor high-voltage isolating switch-fuse combination (FKN-12R.D) integrates the FKN-12D load switch with S□LAJ-12(XRNT□-12) high-pressure current-limiting fuses, providing reliable interruption of any current up to the short-circuit level. This design ensures safe operation and effective protection across a wide range of overcurrent scenarios.
Model Meaning
Main Technical Parameters
|
No. |
Item |
Unit |
FKN12-12D/630-20 |
FKN12-12R.D/125-31.5 |
|
1 |
Rated Voltage |
kV |
12 |
|
|
2 |
Rated Frequency |
Hz |
50 |
|
|
3 |
Rated Current |
A |
630 |
125 |
|
4 |
Lightning Impulse Withstand Voltage |
kV |
Ground and Phase-to-Phase, Isolation Break: 85 |
|
|
5 |
1-minute Power Frequency Withstand Voltage |
kV |
Ground Phase-to-Phase: 42, Isolation Break: 48 |
|
|
6 |
Rated Thermal Withstand Current |
kA |
20(4S) |
|
|
7 |
Rated Dynamic Withstand Current |
kA |
50 |
|
|
8 |
Rated Making Current (Peak) |
kA |
50 |
- |
|
9 |
Rated Short-circuit Breaking Current |
kA |
- |
31.5 |
|
10 |
Rated Transfer Current |
kA |
- |
1.5 |
|
11 |
Maximum Breaking Current (Reference Value) |
kA |
1.8 |
|
|
12 |
No-load Transformer Capacity Breaking |
kVA |
1250 |
|
|
13 |
Rated Cable Charging Current |
A |
10 |
|
|
14 |
Rated Active Load Current Breaking Times |
times |
>100 |
|
|
15 |
Actuator Triggered Load Switch Opening Time |
S |
- |
> 0.06 |
|
16 |
Earthing Switch Thermal Withstand Current |
kA |
20(2S) |
20(2S) |
|
17 |
Earthing Switch Thermal Withstand Current (Peak) |
kA |
50 |
50 |
|
18 |
Motor Operating Power Supply Voltage |
V |
AC220, DC48 |
|
Working Condition
- Ambient air temperature: upper limit +40°C, lower limit -25°C;
- Altitude: 1000m and below;
- Relative humidity: monthly average not exceeding 90%,
- Daily average not exceeding 95%;
- The surrounding air should not be significantly contaminated by corrosive or flammable gases and water vapor, etc.: no frequent violent movement;
- Pollution resistance level: Class II.
- If the usage conditions exceed the above specifications, they shall be determined through consultation between the user and the manufacturer.
Outline and mounting dimensions
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