| Customization: | Available |
|---|---|
| Type: | High-voltage |
| Installation: | Indoor High-voltage |
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The FKN12A-12D Pneumatic Load Switch-Fuse Combination Unit is a high-performance indoor 12kV medium voltage device, designed to perform load breaking, short-circuit protection, and disconnection functions in AC 50Hz power distribution networks. Operated by compressed air (pneumatic mechanism), it offers safe, rapid switching and strong arc extinction capability.
Integrated with current-limiting fuses, it ensures fast protection of transformers, cables, and other electrical equipment under fault conditions. This switch is especially suitable for use in compact substations, industrial distribution cabinets, and RMUs.
| Type | FKN12A-12D |
| Rated Voltage | 12kV |
| Rated Frequency | 50Hz |
| Rated Current | 630A, 125A |
| 1min Power Frequency Withstand Voltage (Phase-to-Ground/Phase-to-Phase) | 42kV |
| 1min Power Frequency Withstand Voltage (Isolation Gap) | 48kV |
| Lightning Impulse Withstand Voltage (Peak) Phase-to-Ground/Phase-to-Phase | 75kV |
| Lightning Impulse Withstand Voltage (Peak) Isolation Gap | 85kV |
| Rated Short-Time Withstand Current (Load Switch) | 20kA, - |
| Rated Short-Time Withstand Current (Earthing Switch) | 20kA |
| Rated Short-Circuit Duration (Load Switch) | 4s, - |
| Rated Short-Circuit Duration (Earthing Switch) | 2s |
| Rated Short-Circuit Making Current (Peak) | 50kA, - |
| Active Load Breaking Current | 630A |
| Closed-Loop Breaking Current | 630A |
| 5% Active Load Breaking Current | 31.5A |
| Cable Charging Current | 10A |
| No-Load Transformer Capacity Breaking | 1250kVA |
| Rated Short-Circuit Breaking Current (Current-Limiting Fuse) | -, 31.5kA |
| Rated Transfer Current | -, 1200A |
| Mechanical Life | 2000 Times |
| Impactor Output Energy | -, 1±0.5J |
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