Littlefuse, FLNR 40, RK5, Time Delay, Dual Element, Fuse

The Littelfuse FLNR 40 is a 40‑amp, Class RK5, time‑delay, dual‑element fuse designed for dependable protection in industrial and commercial electrical systems. Its time‑delay characteristics allow temporary inrush currents—ideal for motors, transformers, and inductive loads—while still providing fast response to sustained overloads and short circuits.

This fuse delivers current‑limiting performance, reducing fault energy and helping protect downstream equipment. A reliable choice for maintenance teams, electricians, and facility managers who need durable, high‑performance overcurrent protection.

Key Features

• 40A Class RK5 fuse

• Time‑delay, dual‑element design supports motor and inductive loads

• 250V AC rating (standard for FLNR series)

• Current‑limiting performance reduces damage during faults

• UL Listed / CSA Certified

• Compatible with Class R fuse blocks

• Durable Littelfuse construction for industrial environments

Common Applications

• Motor circuits

• HVAC equipment

• Industrial machinery

• Control panels

• Transformers

• General branch‑circuit protection