FZN21/FZRN21-12 indoor vacuum load switch is designed for 12 kV, 50 Hz distribution systems. It closes, carries and breaks rated current, supports transformer control and protection, and offers a fuse combination option for ring network applications.
| Parameter | Unit | Value |
|---|---|---|
| Rated Voltage | kV | 12 |
| Rated Frequency | Hz | 50 |
| Maximum Rated Current of the Fuse | A | 125 |
| Transfer Current | A | 1550 |
| Fuse-Triggered Switch Segment Time | ms | 40 ± 5 |
| Rated Short-Circuit Breaking Current | kA | 31.5 |
| Fuse Impinger Type | — | Medium-Sized |
| Rated Short-Circuit Closing CurrentProspective peak value | kA | 80 |
| 1 min Power-Frequency Withstand VoltageVacuum gap, phase-to-phase and phase-to-earth / isolation gap | kV | 42 / 49 |
| Lightning Impulse Withstand VoltageVacuum gap, phase-to-phase and phase-to-earth / isolation gap | kV | 75 / 85 |
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