FLNR500 - 500 Amp Fuse

FLNR500 - 500 Amp Fuse

When your application calls for a 500-amp Class RK5 time-delay fuse, the FLNR500 is built for the job. This dual-element fuse is rated for 250VAC and 125VDC and uses a knife-blade design for installation in compatible fuse blocks, clips, and holders. What makes the FLNR500 especially useful is its time-delay operation. Motors, transformers, and other electrical equipment can pull considerably more current for a short period during startup. The FLNR500 is designed to handle appropriate temporary inrush currents without opening unnecessarily, while still providing protection when an overload or short-circuit condition occurs.

Key Features and Benefits

• 500-amp rating: Designed for circuits requiring a 500A Class RK5 fuse.
• Time-delay performance: Helps accommodate normal temporary startup and inrush currents.
• Dual-element design: Combines time-delay operation with overcurrent protection for properly specified circuits.
• 250 VAC / 125 VDC ratings: Suitable for compatible AC and DC electrical applications.
• Knife-blade construction: Fits compatible fuse blocks, clips, and holders.
• Class RK5 configuration: Designed for applications requiring this specific fuse class.
• LFR25600 Series compatibility: Identified for use with this series of holders.
  

Technical Specifications

• Catalog Number: FLNR500
  
• Series: FLNR
  
• Fuse Class: Class RK5
  
• Current Rating: 500A
  
• Maximum AC Voltage: 250VAC
  
• Maximum DC Voltage: 125VDC
  
• Opening Type: Slo-Blo / Time Lag / Time Delay
  
• Family Style: Dual Element Fuse
  
• AC Interrupting Rating: Up to 300 kA
  
• DC Interrupting Rating: 20 kA
  
• Construction / Size: Knife-Blade
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Holder Series: LFR25600 Series
  

Material Compliance and Certifications

The FLNR500 is part of the FLNR Class RK5 fuse series. For applications where specific regulatory approvals, certifications, or material-compliance requirements must be documented, the current documentation for the exact FLNR500 catalog number should be checked before installation.

It’s also important not to choose a replacement fuse based on amperage alone. The fuse class, voltage rating, interrupting capacity, time-delay characteristics, physical configuration, and application requirements all matter when determining whether the FLNR500 is the correct fit for a particular circuit.

Where It Works Best

The FLNR500 makes the most sense in electrical systems where temporary inrush current is normal but sustained overcurrent still needs dependable protection. Think motor loads, transformers, industrial machinery, manufacturing equipment, and commercial or industrial power-distribution applications where the electrical system is designed for a 500A Class RK5 time-delay fuse.

That time-delay characteristic is particularly important. A motor starting up, for example, can briefly draw substantially more current than it does once it is running. A properly selected time-delay fuse can ride through an acceptable short-duration surge instead of opening unnecessarily.