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Cylindrical cartridge fuse with metal end caps, 9/16 inch diameter, 2 inch length

Littelfuse

Littelfuse FLNR003 Fuse 3A 250VAC/125VDC Class RK5 Time Delay

SKU CH-HW13-2SHSM

A 3 A time-delay cartridge fuse rated 250 VAC and 125 VDC with a 200 000 A AC interrupting capacity for Class RK5 rejection applications

  • 3 A time-delay protection for motor-start surges
  • 250 VAC and 125 VDC ratings cover mixed AC/DC circuits
  • Class RK5 rejection design prevents wrong-fuse insertion
  • 200 kA AC interrupting rating clears heavy fault currents safely
  • Cartridge terminals allow quick tool-free replacement

3 Amp Class RK5 Fuse

This 3 Amp cartridge fuse provides overcurrent protection for circuits rated up to 250 VAC or 125 VDC. It is intended for electrical installations that require a Class RK5 rejection-type device with a time-delay characteristic. The dual-element construction helps tolerate brief inrush currents without nuisance opening.

Interrupting rating and voltage headroom

The fuse carries a 200000 Amp VAC RMS symmetrical interrupting rating and a 20000 Amp VDC rating, giving ample margin for industrial fault currents. It operates reliably within its 250 VAC and 125 VDC limits but is not suitable for higher-voltage systems or applications demanding a faster-acting response.

Cartridge mounting and rejection feature

The 9/16 inch diameter by 2 inch length cartridge fits standard Class RK5 fuse blocks, and the rejection design prevents insertion of lower-rated fuses. This mechanical keying supports correct replacement during maintenance and helps maintain the intended protection level in the field.

Highlights

  • 3 A time-delay protection for motor-start surges
  • 250 VAC and 125 VDC ratings cover mixed AC/DC circuits
  • Class RK5 rejection design prevents wrong-fuse insertion
  • 200 kA AC interrupting rating clears heavy fault currents safely
  • Cartridge terminals allow quick tool-free replacement

Specifications

BrandLittelfuse

Questions about this item

Will the 3 A FLNR003 fuse coordinate with existing 250 VAC branch circuits without nuisance trips?

Its dual-element time-delay design tolerates temporary overloads such as motor inrush while still clearing sustained faults on 250 VAC systems.

How can I confirm the fuse is intact after installation?

Measure continuity across the cartridge terminals with a multimeter; a low resistance reading shows the element is unbroken.

Does the package include fuse holders or must they be purchased separately?

Only the cartridge fuse is supplied; compatible Class RK5 rejection holders are sold separately.

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