LLSRK450ID - 450Amp Fuse

LLSRK450ID - 450Amp Fuse

A machine shuts down, and now someone has to figure out why. Sometimes the problem is a blown fuse. Finding that fuse, though, can take longer than you'd expect, especially in a crowded electrical panel.

The Littelfuse LLSRK450ID helps make that part of the job easier. It's a 450-amp Class RK1 time-delay fuse with a built-in indicator window that darkens when the fuse opens. That gives maintenance technicians a quick visual clue about where to start looking.

Key Features and Benefits

• Easy-to-see blown-fuse indicator
• 450-amp current rating
• Class RK1 current-limiting protection
• Time-delay operation
• Helps prevent nuisance fuse openings
• Precision-formed short-circuit elements
• Solid-state overload section without moving parts
• High interrupting capacity

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLSRK450ID
  
• Series: LLSRK_ID
  
• Product Family: POWR-PRO
  
• Fuse Class: Class RK1
  
• Continuous Current Rating: 450A
  
• Maximum AC Voltage: 600V AC
  
• Maximum DC Voltage: 300V DC
  
• Fuse Type: Slow-Blow / Time-Delay (T)
  
• Blown-Fuse Indicator: Yes
  
• Indicator Technology: Littelfuse Indicator™
  
• AC Interrupting Rating: 200,000A at 600V AC
  
• Additional AC Interrupting Rating: 300,000A at 600V AC, subject to manufacturer rating conditions
  
• DC Interrupting Rating: 20,000A at 300V DC
  
• Mounting Method: Safety Base / Clip / Holder
  
• Associated Holder Series: LFR60600 Series
  
• Short-Circuit Elements: Precision-Formed
  
• Overload Section: Solid-State, No Moving Parts
  

Material Compliance and Certifications

The LLSRK450ID is part of Littelfuse's POWR-PRO Class RK1 fuse lineup. Its construction includes precision-formed short-circuit elements and a solid-state overload section with no moving parts.

That last detail is worth noting. In electrical equipment exposed to regular vibration, eliminating moving parts from the overload section helps avoid the mechanical fatigue associated with spring-loaded fuse designs.

The supplied specifications did not include specific UL or CSA certification details, RoHS and REACH declarations, or material composition information. If your project requires any of these, confirm the applicable documentation with Littelfuse for this catalog number.

Where It Works Best

• Industrial Motor Circuits
• Manufacturing Equipment
• Industrial Control Panels
• Commercial and Industrial Electrical Systems
• High-Current Equipment
• Maintenance-Intensive Facilities