LLNRK450 - 450Amp Fuse

LLNRK450 - 450Amp Fuse

A motor starting up shouldn't stop your entire operation. Yet electrical systems need protection when an overload or short circuit threatens equipment. The trick is knowing the difference between a temporary surge and a genuine problem.

Inside the fuse, two elements work together to handle different electrical conditions. A thermally reversible, spring-loaded overload element allows the fuse to tolerate appropriate short bursts of inrush current. When an overload persists, the fuse responds. That means fewer nuisance openings during normal startup conditions when the fuse is correctly sized for the application.

Key Features and Benefits

• 450 Amp continuous current rating
• Dual-element time-delay operation
• Class RK1 current-limiting design
• High AC interrupting capacity
• 20,000A DC interrupting rating
• Reduced nuisance fuse openings
• Low-resistance construction
• Potential Class H fuse block upgrade
• Non-indicating design

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLNRK450
  
• Series: LLNRK
  
• Product Family: POWR-PRO
  
• Fuse Class: Class RK1
  
• Fuse Type: Dual-Element, Time-Delay
  
• Continuous Current Rating: 450 Amps
  
• Maximum AC Voltage: 250V AC
  
• Maximum DC Voltage: 125V DC
  
• AC Interrupting Ratings: 200,000A and 300,000A at 250V AC, as listed by Littelfuse
  
• DC Interrupting Rating: 20,000A at 125V DC
  
• Opening Characteristic: Slo-Blo / Time Lag (T) / Time Delay
  
• Current-Limiting: Yes
  
• Overload Element: Thermally Reversible, Spring-Loaded Thermal Element
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Specified Fuse Holder Series: LFR25600
  

Material Compliance and Certifications

The manufacturer identifies the Littelfuse LLNRK450 as a Class RK1 current-limiting, time-delay fuse in the POWR-PRO family.

• UL Listing or Certification: Confirm the applicable listing and conditions using current Littelfuse documentation.
• CSA Certification: Verify current certification status and applicable requirements with the manufacturer.
• RoHS Compliance: Consult the latest manufacturer material compliance declaration.
• REACH Compliance: Consult the latest manufacturer material compliance declaration.

Specific certification numbers and material compliance declarations are not established by the specifications provided here. For projects requiring documented approvals, confirm them against the manufacturer's current records.

Where It Works Best

• Service entrance equipment
• Main and feeder circuits
• Motor circuits
• Transformers
• Solenoids and electromagnetic equipment
• Fluorescent lighting circuits
• General-purpose branch circuits
• Existing Class H fuse block upgrades