Ambient air temperature: upper limit +40℃, lower limit -25℃ (allow storage at - 30℃), 24h average value is not higher than +35℃;
Altitude: no more than 1000m;
Relative humidity: daily average value is not greater than 95%, monthly average is not greater than 90%;
Earthquake intensity: do not exceed 8 degree;
The surrounding air is not corrosive and flammable gas,steam and other significant pollution;
No regular violent vibration;
Contamination grade: II class;
| Item | Unit | FZN25-12D/ T630-20 | FZRN25-12D/ T125-20 |
| Voltage, current parameters | |||
| Rated voltage | kV | 12 | |
| Rated frequency | Hz | 50 | |
| Rated current | A | 630 | 125 |
| Rated short time power frequency withstand voltage (1min) | kV | Interrupter fracture 30; phase to earth 42; isolation fracture 48 |
|
| Rated lightning impulse withstand voltage (peak) | kV | Phase to earth 75; isolation fracture 85 |
|
| Rated peak withstand current | kA | 50 | - |
| 4s rated short-time withstand current | kA | 20 | - |
| Rated active load breaking current | A | 630 | - |
| Rated loop breaking current | A | 630 | - |
| Rated cable charging breaking current | A | 10 | - |
| Interrupting no load transformer capacity | kVA | 1250 | - |
| Rated short-circuit breaking current | kA | - | 31.5 |
| Rated transfer current, rated AC current | A | - | 2000 |
| Fuse type | SDLAJ-12 SFLAJ-12 | ||
| The impactor energy output | J | 2-5 (medium) | |
| Rated short-circuit closing current | kA | 50 | |
| Grounding switch rated stability current | kA | 50 | |
| Grounding switch 2S thermal stability current | kA | 20 | |
| The auxiliary circuit rated voltage | V | ≌220/110 | |
| Mechanical life | Times | 10000 | |
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