| Rated voltage(kV) | Highest voltage(kV) | Rated current(A) | Industrial frequency voltage withstand in 1min(kV) | 4S thermal stable current (effective value)(A) |
| 12 | 12 | 400 | 42/48 | 12.5 |
| 12 | 12 | 630 | 42/48 | 20 |
| Active stable current (peak value)(A) | Short circuit close current (A) | Rated open current (A) | Rated transfer current (A) |
| 31.5 | 31.5 | 400 | 1000 |
| 50 | 50 | 630 | 1000 |
| Type | Full type | DS Earthing switch at inlet position | DX Earthing switch at inlet position | L Interlocking device | R Fuse | R Impulse fuse | F Electric drive open device |
| Without release | FN7-12 | - | - | - | - | - | - |
| FN7-12DSL | △ | - | △ | - | - | - | |
| FN7-12DXL | - | △ | △ | - | - | - | |
| FN7-12R | - | - | - | △ | - | - | |
| FN7-12DSLR | △ | - | △ | △ | - | - | |
| FN7-12DXLR | - | △ | △ | △ | - | - | |
| With impulse release | FN7-12RAF | - | - | - | - | △ | △ |
| FN7-12DSLRAF | △ | - | △ | - | △ | △ | |
| FN7-12DXLRAF | △ | △ | - | △ | △ |
| Type | Rated voltage(kV) | Rated current(A) | Rated current of fuse link(A) |
| SDLA*J | 12 | 40 | 6.3, 10, 16, 20, 25, 31.5, 40 |
| SFLA*J | 12 | 100 | 50, 63, 71, 80, 100 |
| SKLA*J | 12 | 125 | 125 |
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