LLNRK600 - 600Amp Fuse

LLNRK600 - 600Amp Fuse

When your 600-amp electrical circuit faults, a lot is at stake. Motors, transformers, distribution equipment, and the systems that depend on them all need protection that can handle normal operating conditions without overlooking a genuine electrical problem.

The Littelfuse LLNRK600 is a 600 Amp, 250V Class RK1 time-delay fuse from the POWR-PRO series. Designed for service entrance equipment, main and feeder circuits, and general-purpose branch circuits, it combines high interrupting capacity with current-limiting protection for demanding commercial and industrial electrical applications.

For electrical systems specifically designed around 600A fuse protection, the Littelfuse LLNRK600 delivers a practical combination of time-delay performance, high fault-interruption capability, and current-limiting protection.

Key Features and Benefits

• 600 Amp Continuous Current Rating
• Dual-Element Time-Delay Protection
• Class RK1 Current-Limiting Performance
• High AC Interrupting Capacity
• 20 kA DC Interrupting Rating
• Reduced Nuisance Fuse Openings
• Low-Resistance Construction
• Potential Class H Fuse Block Upgrade
• Non-Indicating Design
• Fuse Block and Holder Mounting

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLNRK600
  
• Product Series: LLNRK
  
• Product Family: POWR-PRO
  
• Product Type: Dual-Element, Current-Limiting Time-Delay Fuse
  
• Fuse Classification: Class RK1
  
• Continuous Current Rating: 600 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
  
• Protective Elements: Two
  
• Thermal Overload Element: Thermally Reversible, Spring-Loaded
  
• Current-Limiting: Yes
  
• Fuse Status Indication: Non-Indicating
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Specified Holder Series: LFR25600
  

Material Compliance and Certifications

The manufacturer identifies the Littelfuse LLNRK600 as a Class RK1, dual-element, current-limiting time-delay fuse in the POWR-PRO product family.

The supplied product specifications do not establish specific certification numbers and environmental compliance declarations. Confirm any required approvals through current manufacturer documentation before specifying the fuse for regulated applications.

Where It Works Best

• Service Entrance Equipment
• Main Distribution Circuits
• Feeder Circuits
• General-Purpose Branch Circuits
• Motor Circuits
• Transformer Protection
• Solenoids and Electromagnetic Equipment
• Fluorescent Lighting Circuits
• High-Inrush Electrical Loads
• Compatible Class H Fuse Block Upgrades