Littelfuse FLNR500 Class RK5 Fuse – 500A – 250V Time-Delay Fuse

The Littelfuse FLNR500 is a 500 Amp Class RK5 dual-element time-delay fuse designed for industrial and commercial electrical distribution systems. Part of the FLNR series, this knife-blade fuse provides reliable overload and short-circuit protection for feeders, transformers, motors, and other power distribution equipment. Its time-delay characteristics allow temporary inrush currents associated with motor starting and transformer energization while maintaining dependable fault protection.

Electrical Rating

• Current Rating: 500 Amps
• Maximum AC Voltage: 250 VAC
• Maximum DC Voltage: 125 VDC
• Interrupting Rating:
  • 300 kA AC
  • 20 kA DC

Key Specifications

• Manufacturer: Littelfuse
• Catalog Number: FLNR500
• Series: FLNR
• Fuse Class: RK5
• Construction Type: Knife-Blade
• Fuse Type: Dual Element Time-Delay
• Indicating: No

Protection Characteristics

• Time-delay (slow-blow) operation
• Dual-element fuse construction
• Provides overload and short-circuit protection
• Helps prevent nuisance opening during temporary inrush currents
• High interrupting capacity for industrial electrical systems

Construction Features

• Knife-blade terminal design
• Non-indicating fuse configuration
• Industrial-duty construction for demanding environments
• Designed for reliable long-term performance

Mounting & Compatibility

• Mounting Method: Fuse Block / Clip / Holder
• Compatible with standard Class RK5 fuse holders and fuse blocks
• Suitable for switchboards, panelboards, motor control centers, and industrial distribution equipment

Applications

• Motor branch circuit protection
• Transformer protection
• Industrial machinery and equipment
• Commercial electrical distribution systems
• Feeder and branch circuit protection

Product Data

• Manufacturer: Littelfuse
• Catalog Number: FLNR500
• Product Type: Time-Delay Fuse
• Series: FLNR
• Fuse Class: RK5

Returns are easy

You may return items within 30 days of delivery for a refund.

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