FN12-12DR series switch-fuse combinations is a three-phase Medium voltage switchgear with rated voltage of 12kV and rated frequency of 50Hz, and it’s mainly ued to make and break the load current, closed-loop current, no-load transformer and cable charging current, and also close short circuit current. The combination can break short-circuit current, and load break switch with earth switch can bear short circuit current. It’s used for load control and short circuit protection for substations of three ring network or urban buildings and industrial and mining enterprises.
● Model Implication
● Main technical Parameters
No. | Item | Unit | FN12-12/630 | FNR12-12/100-31.5 |
1 | Rated voltage | kV | 12 | |
2 | Rated Frequency | Hz | 50 | |
3 | Rated current | A | 630 | 125 |
4 | Lightning impulse withstand voltage | kV | Phase-to-phase and phase-to-phase75、across isolating distance 85 | |
5 | 1min power frequency withstand voltage | kV | Phase-to-phase and phase-to-phase 42、across isolating distance 48 | |
6 | Rated thermal stability current | kA | 20（4S） | |
7 | Rated dynamic stability current | kA | 50 | |
8 | Rated short circuit breaking current (peak) | kA | 50 | 50 |
9 | Rated short circuit breaking | kA | 31.5 | |
10 | Rated transfer current | kA | 1.5 | |
11 | No-load transformer breaking capacity | KVA | 1250 | |
12 | Rated cable charging current | A | 10 | |
13 | Mechanical life | 次 | 4000 | |
14 | Opening time of load switch triggered by fuse Opening time of LBS triggered by fuse | S | <0.06 | |
15 | Dynamic current of earth switch Thermal stability current of earth switch | kA | 20（4S) | |
16 | Dynamic current of earth switch (Peak) | ka | 50 | |
17 | Supply voltage of control circuit | |||
● FN12-12D/630-20Indoor AC Medium Voltage Load Break Switch Outline and Installation Size
1. Fixed contact
2. Moving contact
3. Shutter
4. Name plate
5. Shutter linkage
6. Valve shaft assembly
7. Operating Mechanism
8. Earth switch shaft
9. Rotation shaft of main shaft
9. Chassis
10. Booster
11. Interlock mechanism
12. Operation panel
● FN12-12DR/100-31.5AC Medium Voltage Switch-fuse Combination Outline and Installation Size
1. Fuse
2. Fixed contact
3. Moving contact
4. Shutter
5. Nameplate
6. Shutter shaft
7. Shutter shaft
8.Earth switch shaft
9.Operating mechanism
10. Main shaft
11.Release shaft
12. Chassis
13. Buffer
14. Interlock mechanism
15. Operation panel
