KLNR350 - 350Amp Fuse

KLNR350 - 350Amp Fuse

When you're replacing a 350A Class RK1 fuse, amperage is only part of the match. The KLNR350 is a 350A fast-acting, current-limiting fuse with a single-element silver-link design engineered to provide fast-acting overload and short-circuit protection. The supplied specifications identify the LFR25400 Series holder. Before using the KLNR350 as a replacement, confirm the fuse class, voltage, interrupting rating, opening characteristic, physical configuration, and mounting requirements—not simply the 350A rating.

Key Features and Benefits

• 350A continuous current rating for equipment requiring a 350-amp Class RK1 fuse.
• Fast-acting (F) operation provides quick response to overload and short-circuit conditions.
• Built around a single-element silver-link design used by the KLNR/KLSR series.
• Current-limiting construction helps reduce equipment damage caused by the heating and magnetic effects of short-circuit currents.
• Rated for operation up to 250VAC.
• Knife-blade construction provides the specified physical format for the KLNR350.
• Non-indicating design means the fuse does not include an indication feature for fuse status.
• Installs using a compatible fuse block, clip, or holder.

Technical Specifications

• Catalog Number: KLNR350
  
• Manufacturer Description: FUS 250V F/A CLASS RK1 350A
  
• Series: KLNR
  
• Product Type: Fast-Acting Current-Limiting Fuse
  
• Continuous Current Rating: 350A
  
• 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 KLNR350's Class RK1 designation, fast-acting opening characteristic, current-limiting family style, single-element silver-link design, knife-blade construction, and electrical ratings. The manufacturer's broader KLNR/KLSR information also covers applications that require the current-limiting ability of UL Class RK1 fuses.

Where It Works Best

The KLNR350 350A fuse suits electrical equipment that requires a 350A Class RK1 fast-acting, current-limiting fuse with knife-blade construction. Manufacturer guidance identifies variable speed drives, rectifiers, and other equipment containing surge-sensitive components as examples where the KLNR/KLSR series' fast-acting characteristics can be useful. For an AC circuit, confirm requirements against the 250VAC maximum and 200,000A interrupting rating at 250VAC. For DC service, verify compatibility with the 125VDC maximum and 20,000A interrupting rating at 125VDC.