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Basic Info.
Product Description
Application
FKN12 load break switch It is used in the ring network city distribution and industrial equipment of 12KV and three-phase AC 50Hz to cortrol load and
short-circuit. Because the switch with fuse protecting transformer etc more reliably than circuit breaker. It is especialy
suitable for ring network clouble radial distribution and package substation.
Standard
a. GB3804-90 <<3-63KV AC H.V load switch>>.
b. GB16926-1997 <>(eqv, IEC62271-2002).
c. GB1995-89 <>.
Operating environmental conditions:
1.Altitude: ≤1000m
2.ambient air temperature: not higher than +40°C,not lower than-25°C
3.Relative humidity: daily mean is not more than 95%, monthly mean is not more than 90%
4.Earthquake intensity: not more than 8°
5.no fire, explosion hazard, chemical etching and intense vibration
6.Pollution grade: II
7. Ambient air shouldn't be polluted by corrosive or flammable gas and vapor.
(Note:Spring operating mechanism has electric and manual types)
| NO. | Items | Unit | Data | |
| FKN12-12D/630 | FKN12-12(R)D/630 | |||
| 1 | Rated voltage | KV | 12 | |
| 2 | Rated frequency | Hz | 50 | |
| 3 | Rated Current | A | 630 | 1250 |
| 4 | Lightning impulse withstand voltage | KV | To earth and phase to phase 75, isolation fracture 85 | |
| 5 | 1 min power frequency withstand voltage | KA | To earth and phase to phase 42, isolation fracture 48 | |
| 6 | Rated thermal stability current | KA | 20(4s) | |
| 7 | Rated dynamic current | KA | 50 | |
| 8 | Rated dosing current (peak) | KA | 50 | 50 |
| 9 | Rated short circuit breaking current (Expected value) | KA | 31.5 | |
| 10 | Maximum at critical breaking current | A2S | According to the fuse characteristic curve | |
| 11 | Minimum breaking current | KA | According to the fuse characteristic curve | |
| 12 | Rated transfer current | KA | 1.5 | |
| 13 | Maximum breaking current (reference value) | KA | 1.8 | |
| 14 | Breaking the capacity of the no-load transformer | KVA | 1250 | |
| 15 | Rated cable charging current | A | 10 | |
| 16 | Rated active load current breaking times | Times | >100 | |
| 17 | The impactor touches the load switch opening time | S | >0.06 | |
| 18 | Earthing switch thermal stability current | KA | 20(2S) | |
| 19 | Earthing switch thermal stability current (peak) | KA | 50 | |
| 20 | Motor operating power supply voltage | V | AC DC 110, 220 | |
Mechanism parameters:
| No. | Name | Unit | Data |
| 1 | Fracture from | mm | >175 |
| 2 | Phase center distance | mm | 210±2 |
| 3 | Interphase air gap | mm | > 125 |
| 4 | Trip | mm | 210 |
| 5 | Over Trip | mm | >40 |
| 6 | Three-phase closing is not the same period | ms | <10 |
| 7 | Three-phase opening is not the same period | ms | <5 |
| 8 | The inherent opening time of divider exciter | ms | 40-65 |
| 9 | Main circuit resistance | uΩ | <300 |
The Fuse Rated current depend on the Transformer capacity for FKRN12A-12D Load break-Fuse combination
| Transformer capacity(kva) | 100 | 125 | 160 | 200 | 250 | 300/315 | 400 | 500 | 630 | 750/800 | 1000 | 1250 |
| Fuse Rated current(A) | 16 | 16 | 16 | 20 | 25 | 31.5 | 40 | 50 | 63 | 80 | 80/100 | 100/125 |
Optional accessories
| Optional accessories | Main parameters |
| Electrically operated mechanism Switch can be operated remotely with electric operation mechanism to control opening and closing. | Rated Voltage:AC220V,DC220V,DC48V,DC24V Rated current:0.8A, 3.6A, 7.2A Rated Watts:120w Storage time:2-4s Working time:2s/1min |
| Shunt Trip | Rated current:AC220V Internal resistance:32Ω |
| Over current trip | 5A |
| Auxiliary contact Both for load break and earthing switch | Maximum voltage withstand value :Ac500V Maximum permissible current value :5A Auxiliary contact: two open and one closed, two open and two closed, Three open three closed, four open four closed |
| Interlocking between switchgear This series of load switches can be interlocked between cabinets with special interlocking | Load switches with interlocking if one of the switches breaks, The other switch closes automatically, and the interlocking cannot be removed after closing. |
Install drawing
