LLNRK090 - 90Amp Fuse

LLNRK090 - 90Amp Fuse

When your electrical equipment starts up, a temporary current surge is often normal. The challenge is protecting that equipment from dangerous overloads and short circuits without interrupting power every time a motor or transformer switches on. That's where the Littelfuse LLNRK090 90 Amp Class RK1 time-delay fuse comes in. Part of the Littelfuse POWR-PRO™ LLNRK series, this dual-element fuse delivers strong current-limiting protection while allowing the brief inrush currents common to industrial and commercial equipment.

Key Features and Benefits

• 90 Amp Continuous Current Rating
• 250V AC / 125V DC Voltage Ratings
• Class RK1 Current-Limiting Protection
• High Short-Circuit Interrupting Capacity
• Dual-Element Time-Delay Design
• Reduced Nuisance Fuse Openings
• Thermally Reversible Overload Element
• Low-Resistance Construction
• Non-Indicating Design

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLNRK090
  
• Product Series: LLNRK
  
• Product Family: POWR-PRO™
  
• Product Type: Current-Limiting Time-Delay Fuse
  
• Fuse Class: Class RK1
  
• Continuous Current Rating: 90 Amps
  
• Maximum AC Voltage: 250V AC
  
• Maximum DC Voltage: 125V DC
  
• AC Interrupting Ratings: 200,000A and 300,000A at 250V AC, as listed in manufacturer specifications
  
• DC Interrupting Rating: 20,000A at 125V DC
  
• Opening Characteristic: Slo-Blo / Time Lag / Time Delay
  
• Element Configuration: Dual-Element
  
• Overload Element: Thermally Reversible, Spring-Loaded
  
• Fuse Indication: Non-Indicating
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Compatible Holder Series: LFR25100
  
• Fuse Block Compatibility: Suitable for Class RK1 fuse blocks and compatible existing Class H fuse blocks
  

Material Compliance and Certifications

The Littelfuse LLNRK090 is part of the POWR-PRO Class RK1 fuse family, engineered for current-limiting overload and short-circuit protection in commercial and industrial electrical systems.

• Material Compliance: Current RoHS and REACH status should be confirmed through Littelfuse documentation
• Safety Certifications: Applicable UL, CSA, and other approvals should be verified against current manufacturer records

For projects with specific certification or material compliance requirements, review the latest Littelfuse documentation to confirm the declarations and approvals applicable to the LLNRK090.

Where It Works Best

• Industrial Motors
• Transformers
• Service Entrance Equipment
• Main and Feeder Circuits
• General-Purpose Branch Circuits
• Solenoids
• Fluorescent Lighting Systems
• High-Inrush Electrical Loads
• Commercial Electrical Distribution
• Industrial Control Equipment
• Class H Fuse System Upgrades