Medium Voltage Indoor Load Break Switch (Switch-fuse Combination), FKN12A-12/FKRN12A-12
This medium voltage indoor load break switch is used in three phase power distribution systems with voltage up to 12KV, aiming at controlling and protecting transformers, cables, overhead lines and other power equipment. It is suitable for substations of rural and urban power networks, and can protect electrical power in open ring or radial distribution systems.
FKN12A- 12D series load break switch is capable of breaking and closing of load current and overload current.
FKRN12A- 12D series load break switch (switch-fuse combination) is capable of breaking and closing load current, overload current and short-circuit current.
Technical Parameters
| Item | Unit | FKN12A-12D | FKRN12A-12D | |
| Rated voltage | KV | 12 | 12 | |
| Rated frequency | Hz | 50 | 50 | |
| Rated current | A | 630 | 125 | |
| Power frequency withstand voltage(1min) | KV | 42 | 42 | |
| Lightning impulse withstand voltage(peak) |
75 | 75 | ||
| Rated short-time withstand current | Load switch | KA | 20 | – |
| Earthing switch | 20 | |||
| Rated short-circuit duration | Load switch | S | 4 | – |
| Earthing switch | 2 | |||
| Rated short-circuit making current(peak) | KA | 50 | – | |
| Rated closed-loop breaking current | A | 630 | – | |
| Rated short-circuit breaking current | KA | – | 31.5 | |
| Mechanical endurance | Times | 2000 | 2000 | |
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