FN18-12 and FN18-24 indoor high voltage load break switches are air insulated medium voltage switch disconnectors designed for switchgear, RMU, and transformer protection applications.
Featuring puffer-type arc extinguishing technology, fuse combination options, and compact modular construction, they provide reliable switching performance for 12kV and 24kV distribution systems.
The FN18-12 and FN18-24 series indoor high voltage load break switches and fuse combinations are medium voltage air insulated switch disconnectors designed for 12kV and 24kV distribution systems.
Equivalent to ABB NAL/NALF type load break switches, the FN18 series combines advanced puffer-type arc extinguishing technology with compact modular construction, providing reliable load switching and transformer protection for switchgear, ring main units (RMU), and compact substations.
| Item | FN18-12 | FN18-24 |
|---|---|---|
| Tegangan Pengenal | 12kV | 24kV |
| Nilai Saat Ini | 400A / 630A / 1250A | 400A / 630A / 1250A |
| Frekuensi yang dinilai | 50Hz / 60Hz | 50Hz / 60Hz |
| Short-Time Withstand Current | 20kA / 25kA / 31.5kA | 16kA / 25kA / 31.5kA |
| Peak Withstand Current | 82kA | 82kA |
| Power Frequency Withstand Voltage | 42kV / 45kV | 55kV / 70kV |
| Lightning Impulse Withstand Voltage | 75kV / 85kV | 125kV / 145kV |
| Mechanical Life | 2000 Operations | 2000 Operations |
| Arc Extinguishing Method | Puffer Air Type | Puffer Air Type |
| Installation | Indoor | Indoor |
The FN18 load break switch adopts a compressed-air and gas-generating puffer arc extinguishing chamber. During opening operations under load conditions, the mechanism generates airflow that rapidly cools and extinguishes the arc, ensuring safe interruption of load current while minimizing contact erosion. In fuse combination versions, high voltage current-limiting fuses provide short-circuit protection and automatic tripping functionality.
The FN18 indoor load break switch is widely used in:
Compatible design and performance suitable for replacement and OEM switchgear applications.
Puffer-type air insulation technology ensures efficient and stable load switching operations.
Flexible configurations allow integration into various switchgear and RMU systems.
Fuse combination type provides reliable overload and short-circuit protection for transformers and cables.
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