KLSR250 - 250Amp Fuse

KLSR250 - 250Amp Fuse

A 250-amp rating may be the first thing you notice on the KLSR250, but getting the replacement right means checking the complete specification. The KLSR250 is a 250A Class RK1 fast-acting, current-limiting fuse built around the KLSR Series' single-element silver-link design. Its fast-acting characteristics make the KLSR Series particularly relevant to properly specified variable speed drives, rectifiers, and other equipment containing surge-sensitive components. One important distinction: the manufacturer cautions that inductive loads such as motors, solenoids, and transformers can produce harmless inrush currents that require different sizing considerations. In other words, don't choose this fuse by amperage alone—verify Class RK1 compatibility, voltage, interrupting capacity, fast-acting response, physical construction, and the requirements of the equipment being protected.

Key Features and Benefits

• 250A continuous current rating for equipment specifically requiring a 250-amp fuse.
• Class RK1 fuse configuration provides an important compatibility point when identifying a replacement.
• Fast-acting (F) opening characteristic provides fast overload and short-circuit protection.
• Uses the KLSR Series' single-element silver-link design.
• Current-limiting construction reduces equipment damage caused by the heating and magnetic effects of short-circuit currents.
• Rated for electrical systems up to 600VAC.
• Also rated for appropriately specified applications up to 300VDC.
• Knife-blade construction provides the physical configuration specified for KLSR250.
• Non-indicating design means an integral blown-fuse indicator is not specified.
• Designed for mounting in a compatible fuse block, clip, or holder.

Technical Specifications

• Catalog Number: KLSR250
  
• Manufacturer Description: FUS 600V F/A CLASS RK1 250A
  
• Series: KLSR
  
• Product Type: Fast-Acting, Current-Limiting Fuse
  
• Continuous Current Rating: 250A
  
• 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: LFR60400 Series
  

Material Compliance and Certifications

The supplied manufacturer information specifically identifies the KLSR Series as having a single-element silver-link design. The supplied specifications do not include a complete product-specific material breakdown for the KLSR250—including body, terminal, filler, and other component materials—so those materials should not be assumed.

Where It Works Best

The KLSR250 250A fuse best matches electrical equipment designed for a 250A Class RK1, fast-acting, current-limiting fuse with the corresponding electrical and physical requirements. Manufacturer guidance specifically calls out variable speed drives, rectifiers, and other equipment containing surge-sensitive components as examples where the KLSR Series' fast-acting characteristics can be useful. Its current-limiting design is intended to reduce damage associated with the heating and magnetic effects of short-circuit currents.