KLNR400 - 400Amp Fuse

KLNR400 - 400Amp Fuse

The KLNR400 is a 400A Class RK1 fast-acting, current-limiting fuse designed for your electrical equipment that requires quick overload and short-circuit protection. Its single-element silver-link design is a defining feature of the KLNR series, combining fast-acting operation with current-limiting performance. This 400-amp fuse uses knife-blade construction, is non-indicating, and mounts in a compatible fuse block, clip, or holder; the supplied specifications identify the LFR25400 Series holder. For replacement applications, don't stop at the 400A marking—confirm Class RK1, voltage, interrupting rating, fast-acting characteristics, physical configuration, and mounting compatibility with the equipment you're servicing.

Key Features and Benefits

• 400A continuous current rating for equipment specifically requiring a 400-amp Class RK1 fuse.
• Fast-acting (F) opening characteristic provides rapid overload and short-circuit protection.
• Uses the KLNR series' single-element silver-link design.
• Current-limiting construction helps reduce equipment damage associated with the heating and magnetic effects of short-circuit currents.
• Rated for electrical systems up to 250VAC.
• Knife-blade construction provides the specified physical format for the KLNR400.
• Non-indicating design with no built-in fuse-status indication feature.
• Designed for installation using a compatible fuse block, clip, or holder.
• The supplied product specifications identify the LFR25400 Series as the applicable holder series.

Technical Specifications

• Catalog Number: KLNR400
  
• Manufacturer Description: FUS 250V F/A CLASS RK1 400A
  
• Series: KLNR
  
• Product Type: Fast-Acting Current-Limiting Fuse
  
• Continuous Current Rating: 400A
  
• Maximum AC Voltage: 250VAC
  
• Maximum DC Voltage: 125VDC
  
• AC Interrupting Rating: 200,000A at 250VAC
  
• DC Interrupting Rating: 20,000A at 125VDC
  
• Opening Characteristic: Fast-Acting (F)
  
• Fuse Class: Class RK1
  
• Family Style: Current Limiting
  
• Element Design: Single-element silver link
  
• Construction / Size: Knife-Blade
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Specified Holder Series: LFR25400 Series
  

Material Compliance and Certifications

The supplied manufacturer information confirms the KLNR400's Class RK1 designation, 400A continuous rating, fast-acting operation, current-limiting family style, single-element silver-link design, knife-blade construction, and stated AC/DC electrical ratings. The manufacturer also references applications requiring the current-limiting ability of UL Class RK1 fuses.

Where It Works Best

The KLNR400 400A fuse best matches equipment designed for a 400A Class RK1 fast-acting, current-limiting fuse with knife-blade construction. The manufacturer specifically identifies variable speed drives, rectifiers, and other equipment containing surge-sensitive components as examples where KLNR/KLSR fast-acting protection can be useful. For AC applications, verify the equipment requirements against the 250VAC maximum voltage and 200,000A interrupting rating at 250VAC. For DC applications, the corresponding limits are 125VDC maximum and 20,000A interrupting capacity at 125VDC.