KLSR125 - 125Amp Fuse

KLSR125 - 125Amp Fuse

When your equipment calls for a 125A Class RK1 fast-acting fuse, getting the details right matters beyond simply matching the amp rating. The KLSR125 is a 125-amp, fast-acting, current-limiting fuse featuring a single-element silver-link design and knife-blade construction. The manufacturer specifically identifies variable speed drives, rectifiers, and other equipment containing surge-sensitive components as applications where KLSR fast-acting protection can be useful. The KLSR125 is non-indicating and installs in a compatible fuse block, clip, or holder; the LFR60200 Series is specified as the PG holder. For replacement work, check the complete electrical and physical specification—not just “125A” on the label.

Key Features and Benefits

• 125A continuous current rating for equipment requiring a 125-amp Class RK1 fuse.
• Class RK1 design provides a clearly defined fuse class for replacement and equipment compatibility checks.
• Fast-acting (F) opening characteristic delivers fast overload and short-circuit protection.
• Built around a single-element silver link, consistent with the KLSR Series design.
• Current-limiting construction helps reduce equipment damage caused by the heating and magnetic effects of short-circuit currents.
• Rated for compatible AC circuits up to 600VAC.
• Supports compatible DC circuits up to 300VDC.
• Knife-blade construction gives the KLSR125 its specified physical connection format.
• The non-indicating design does not include a built-in blown-fuse indicator.
• Designed for installation using a compatible fuse block, clip, or holder.

Technical Specifications

• Catalog Number: KLSR125
  
• Manufacturer Description: FUS 600V F/A CLASS RK1 125A
  
• Series: KLSR
  
• Product Type: Fast-Acting, Current-Limiting Fuse
  
• Continuous Current Rating: 125A
  
• Maximum AC Voltage: 600VAC
  
• Maximum DC Voltage: 300VDC
  
• AC Interrupting Capacity: 200,000A at 600VAC
  
• DC Interrupting Capacity: 20,000A at 300VDC
  
• Listed Interrupting Rating: 20 kA at 300VDC
  
• Opening Characteristic: Fast-Acting (F)
  
• Fuse Class: Class RK1
  
• Family Style: Current Limiting
  
• Construction / Size: Knife-Blade
  
• Element Design: Single-element silver link
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Specified PG Holder: LFR60200 Series
  

Material Compliance and Certifications

The supplied manufacturer information identifies the KLSR Series as having a single-element silver-link design. Beyond that silver-link detail, the manufacturer did not provide a complete, product-specific material composition for the KLSR125, so do not assume additional body, terminal, filler, or internal materials.

Where It Works Best

The KLSR125 125A fuse is best suited to electrical equipment specifically designed for a 125A Class RK1 fast-acting, current-limiting fuse with matching voltage, interrupting, and physical requirements. The manufacturer identifies variable speed drives, rectifiers, and other equipment containing surge-sensitive components as applications where the fast-acting characteristics of KLSR fuses can provide useful protection. Its current-limiting design also helps reduce damage associated with the heating and magnetic effects of short-circuit currents.