FRN-R-125 - 125Amp Fuse

FRN-R-125 - 125Amp Fuse

Need to replace an FRN-R-125 fuse? There are a few specifications worth checking before you make the match. This 125A Class RK5 fuse is rated for 250V AC and 125V DC and uses a dual-element, blade-to-blade construction. Physically, the FRN-R-125 measures 2.1 inches long, 0.54 inches high, and 0.54 inches wide, so both its electrical ratings and blade-style configuration should be checked when replacing an existing fuse. In other words, if you're trying to identify the correct FRN-R-125, you have several concrete specifications to work with—not just the 125A rating printed on the fuse.

Key Features and Benefits

• 125A Class RK5 fuse – Gives you a clearly defined amperage and fuse class to compare with the equipment specification.
• 250V AC / 125V DC ratings – Covers properly specified AC and DC applications within the published voltage limits.
• Dual-element construction – An important operating characteristic of the FRN-R-125 and one to confirm when selecting a replacement.
• 10-second response at 500% – Gives technicians specific manufacturer-published response data rather than relying on assumptions about fuse behavior.
• Blade end × blade end connection – Makes the physical connection style straightforward to identify during maintenance or replacement.
• Non-indicating configuration – Matches equipment that specifies this particular fuse configuration.
  

Technical Specifications

• Catalog Number: FRN-R-125
  
• Product Type: Fuse
  
• Series: FRN-R
  
• Fuse Class: Class RK5
  
• Amperage Rating: 125A
  
• AC Voltage Rating: 250V AC
  
• DC Voltage Rating: 125V DC
  
• AC Interrupting Rating: 200 kAIC at 250V AC
  
• DC Interrupting Rating: 20 kAIC at 125V DC
  
• Response Time: 10 seconds at 500% of rated current
  
• Number of Elements: Dual
  
• Connection: Blade end × blade end
  
• Fuse Indicator: Non-indicating
  
• Length / Depth: 2.1 in
  
• Height: 0.54 in
  
• Width: 0.54 in
  
• Product Weight: 0.5 lb
  
• Packaging Type: Standard
  
• UPC: 051712507455
  

Material Compliance and Certifications

The supplied specifications identify the FRN-R-125 as CE Marked. That gives electricians, maintenance teams, and purchasing personnel a specific compliance detail to check when confirming the exact fuse required for a job.

If a project calls for additional certifications or material compliance standards, verify those requirements specifically for the FRN-R-125. It's better to confirm the exact catalog number than assume that an approval associated with another FRN-R fuse automatically applies to this one.

Where It Works Best

• Replacing an existing FRN-R-125 – A natural choice when the original equipment calls for this exact catalog number and its specifications match the installation.
• 125A Class RK5 fuse applications – For equipment requiring this particular combination of amperage rating and fuse class.
• 250V AC circuits – Suitable for correctly specified applications within its 250V AC rating and 200 kAIC interrupting capacity.
• Blade-style fuse installations – Especially relevant where blade-to-blade construction is required for physical compatibility.
• Non-indicating fuse requirements – Matches installations where a non-indicating fuse is specified.