Description
The Littelfuse FLNR400 is a 400 amp, 250 V time‑delay Class RK5 fuse engineered for extremely high‑capacity overcurrent protection in demanding industrial and commercial electrical systems. Featuring a dual‑element slow‑blow design, it allows temporary inrush currents from motors, transformers, and other inductive loads to occur without nuisance openings while still providing robust protection against sustained overloads and short circuits. With exceptional current‑limiting performance and a high interrupting rating, the FLNR400 helps safeguard sensitive equipment and improve system reliability. Its rugged cartridge‑style construction delivers long‑lasting performance in power distribution panels, motor control centers, and other high‑current applications where dependable circuit protection is essential.
Key Features:
- 400 amp current rating for very heavy‑duty circuit protection
- 250 V AC / 125 V DC voltage rating
- Time‑delay (dual‑element slow blow) design accommodates inrush currents
- Class RK5 fuse provides effective current‑limiting protection
- High interrupting capacity for enhanced safety
- Durable cartridge‑style construction
- Ideal for large motors, transformers, and power distribution systems







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