Type Disconnector 12KV 24KV 36KV FN7- 12R load break switch
FN7- 12R(L) model indoor AC HV load break switch-fuse combination apparatus is developed and designed based on international technology and national power supply requirement, it passed all type tests and trial-operation inspections. The apparatus conforms to IEC420: AC LOAD BREAK SWITCH AND FUSE COMBINATION APPARATUS(1990 EDITION) Compared to international product it keeps up with technical level with small volume and light weight. It is applicable in ring main unit and prefabricated substations as well as 12kv line and power distribution system. The product realizes three working positions: power making. power breaking and earth. It applies to power system of rated voltage 6- 12kv, 50/60HZ breaking load current over load current and short-circuit current.
Conditions of the environment
1. Below a thousand meters in altitude.
2. Outside temperature range: -25°C to +40°C.
3. The air's relative humidity: daily <95%, monthly ≤ 90%.
4. Earthquake amplitude: magnitude 8.
5. There should be no fire, combustible materials, explosives, corrosives, or extreme vibration during application occasions.
| Rated voltage KV | 1min frequency Voltage KV | Rated Current A | 4S thermal current A | Dynamic current (peak)KA | Rated breaking current A | Short circuit close current KA |
| 12 | 42 | 400 | 12.5 | 31.5 | 400 | 31.5 |
| 48 | 630 | 20 | 50 | 630 | 50 |