KLSR450 - 450Amp Fuse

KLSR450 - 450Amp Fuse

A 450A rating may be the first thing you notice on the KLSR450, but choosing the right replacement takes more than matching amperage. The KLSR450 is a Class RK1 fast-acting, current-limiting fuse built around a single-element silver-link design for fast overload and short-circuit protection. Before replacing an existing fuse, verify the full specification—not just 450A—including Class RK1 requirements, voltage, interrupting capacity, fast-acting behavior, physical construction, and mounting compatibility.

Key Features and Benefits

• 450A continuous current rating for equipment specifically designed around a 450-amp fuse requirement.
• Class RK1 configuration provides an important matching point when replacing an existing fuse.
• Fast-acting (F) operation provides fast overload and short-circuit protection.
• Built with a single-element silver link, as specified for the KLSR Series.
• Current-limiting design helps reduce equipment damage caused by the heating and magnetic effects of short-circuit currents.
• Rated for electrical systems requiring up to 600VAC.
• Also rated for properly matched DC applications up to 300VDC.
• Knife-blade construction provides the physical format specified for the KLSR450.
• Designed for installation with a compatible fuse block, clip, or holder.
• Non-indicating design means the fuse does not include an integral blown-fuse indicator.

Technical Specifications

• Catalog Number: KLSR450
  
• Manufacturer Description: FUS 600V F/A CLASS RK1 450A
  
• Series: KLSR
  
• Product Type: Fast-Acting, Current-Limiting Fuse
  
• Continuous Current Rating: 450A
  
• 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: LFR60600 Series
  

Material Compliance and Certifications

The manufacturer identifies the KLSR Series as using a single-element silver-link design. That supports the silver-link construction stated above, but the supplied product information does not provide a complete material composition for the KLSR450. Therefore, do not assume materials for the fuse body, terminals, filler, or other components from another catalog number or fuse family.

Where It Works Best

The KLSR450 best matches electrical equipment that requires a 450A Class RK1 fast-acting, current-limiting fuse with compatible voltage, interrupting, and physical specifications. The manufacturer specifically identifies variable speed drives, rectifiers, and other equipment containing surge-sensitive components as examples where the fast-acting characteristics of KLSR fuses can provide appropriate protection. Its current-limiting design is also intended to reduce equipment damage associated with the heating and magnetic effects of short-circuit currents.