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FN5-12 Series indoor high voltage load switch and fuse combination

The FN5-12 Series is a compact, lightweight indoor AC high voltage load switch-fuse combination apparatus, designed for 6-12kV distribution systems. Developed using advanced international technology, it reliably breaks load currents, overload currents, and short-circuit currents. Featuring three working positions (make, break, and earth), it is ideal for ring main units and prefabricated substations. Compliant with IEC420 and GB3804 standards, this apparatus offers space-saving installation and robust protection for transformers and power lines in a small footprint.

Product Details

Technical specification

Rated voltage KV	1min frequency voltage KV	Rated Current A	4S thermal current A	Dynamic current (peak)KA	Rated breaking current A	Short circuit close current KA
12	42	400	12.5	31.5	400	31.5
12	48	630	20	50	630	50

Fuse ratings

Model	Rated voltage(KV)	Rated current(A)	Fondant rated current (A)
SDLA*J	12	50	6.3,10,16,20,25,31.5,40
SFLA*J	12	100	50,63,71,80,100
SKLA*J	12	125	125

Product Model

Dimension

Product Functions

◆Comprehensive Switching: Capable of making and breaking load currents and overload currents in 12kV power systems.
◆Short-Circuit Protection: Integrates a fuse to safely interrupt short-circuit currents, protecting downstream equipment and lines.
◆Three-Position Operation: Realizes three distinct working positions—power making, power breaking, and earthing—for enhanced operational safety.
◆Compact Protection: Designed with a small volume and light weight without compromising on breaking capacity, making it ideal for space-constrained indoor installations.

Applicable Environment

◇Rated Voltage: Suitable for 6-12kV AC power systems at 50/60Hz.
◇Installation Altitude: Designed for installation at elevations up to 1000 meters.
◇Temperature Range: Reliable operation in ambient temperatures from -25℃ to +40℃.
◇Humidity Tolerance: Withstands high humidity environments with monthly average ≤90% and daily average ≤95%.
◇Seismic & Safety: Capable of withstanding earthquakes up to degree 8 and is certified for locations free from fire, explosion, and corrosion hazards.

Product Highlights

◆Internationally Certified Design: Conforms to IEC420 (1990 edition) and GB3804 standards, having passed all type tests and trial-operation inspections.
◆Compact & Lightweight: Compared to international counterparts, this model achieves the same technical level but with a smaller volume and lighter weight, saving valuable space in switchgear.
◆Three-Station Configuration: The integrated design allows for power make, break, and earthing functions within a single unit, simplifying system architecture.
◆Versatile Application: Specifically developed for modern power distribution needs, it is perfectly suited for ring main units (RMU), prefabricated substations, and 12kV line protection.
◆Advanced Technology Foundation: Developed based on international technology and national power supply requirements, ensuring reliable field performance.