FRN-R-400 - 400Amp Fuse

FRN-R-400 - 400Amp Fuse

The FRN-R-400 is a serious 400-amp fuse, and there's plenty here to help you confirm whether you've got the right part. It's a Class RK5 dual-element fuse rated for 250V AC and 125V DC, with blade connections at both ends. It's also the non-indicating version and is listed with Finger Safe as a special feature. If FRN-R-400 is the catalog number on your equipment documentation or existing fuse, compare these ratings and dimensions with the application requirements before putting the replacement into service.

Key Features and Benefits

• 400A, Class RK5. Dual-element construction.
• 250V AC / 125V DC voltage ratings cover the fuse's published AC and DC operating specifications.
• 10 seconds at 500% of rated current – a specific response-time figure you can reference against the equipment requirements.
• Blade end × blade end. This is especially important when checking the physical connection against an existing fuse or fuse mounting arrangement.
• Non-indicating configuration.
• Finger safe is listed as a special feature for this catalog number.
  

Technical Specifications

• Catalog Number: FRN-R-400
  
• Product Name: Eaton Bussmann Series FRN-R Fuse
  
• Product Type: Fuse
  
• Series: FRN-R
  
• Amperage Rating: 400A
  
• Fuse Class: Class RK5
  
• Voltage Rating: 250V AC / 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
  
• Special Feature: Finger safe
  
• Length / Depth: 8.63 in
  
• Height: 2.06 in
  
• Width: 2.06 in
  
• Product Weight: 1.6 lb
  
• Packaging Type: Standard
  
• UPC: 051712507530
  
• EAN: 5027590060813
  

Material Compliance and Certifications

The supplied manufacturer information lists the FRN-R-400 as CE-marked. No additional catalog-specific certifications or material-compliance declarations were included in the information provided.

Where It Works Best

• Equipment documentation specifically calling for FRN-R-400, or where every required electrical and physical specification has been confirmed.
• 400A Class RK5 fuse locations with blade connections, accommodating 8.63 × 2.06 × 2.06-inch dimensions.
• 250V AC circuits where the required interrupting capacity is met by the fuse's 200 kAIC rating at 250V AC.
• Installations specifying a dual-element, non-indicating fuse with the stated 10-second response at 500% of rated current.