LLNRK045 - 45Amp Fuse

LLNRK045 - 45Amp Fuse

When your motor starts, or a transformer powers up, a brief current surge is normal. The last thing you want is a fuse opening every time. The Littelfuse LLNRK045 45 Amp, 250V Class RK1 time-delay fuse handles those temporary surges while protecting electrical equipment from dangerous overloads and short circuits. Its specially designed thermal overload element provides the time delay needed to reduce nuisance fuse opening, while its current-limiting performance helps minimize the energy released during a short circuit.

Key Features and Benefits

• 45 Amp Current Rating
• 250V AC / 125V DC Voltage Ratings
• Class RK1 Current-Limiting Protection
• Dual-Element Time-Delay Design
• Reduced Nuisance Fuse Opening
• Low-Resistance Design
• Class H Fuse Block Compatibility
• Flexible Mounting Options

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLNRK045
  
• Product Series: LLNRK
  
• Product Family: POWR-PRO™
  
• Product Type: Current-Limiting Time-Delay Fuse
  
• Fuse Class: Class RK1
  
• Continuous Current Rating: 45 Amps
  
• Maximum AC Voltage: 250V AC
  
• Maximum DC Voltage: 125V DC
  
• AC Interrupting Rating: 300,000A at 250V AC
  
• Additional AC Interrupting Rating: 200,000A at 250V AC
  
• DC Interrupting Rating: 20,000A at 125V DC
  
• Opening Characteristic: Slo-Blo / Time-Delay
  
• Element Configuration: Dual-Element
  
• Fuse Indication: Non-Indicating
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Compatible Holder Series: LFR25060
  
• Compatible Fuse Block Type: Suitable for Class RK1 and existing Class H fuse blocks
  

Material Compliance and Certifications

The Littelfuse LLNRK045 belongs to the POWR-PRO Class RK1 fuse family and provides effective overload and short-circuit protection for industrial and commercial electrical systems.

• Material Compliance: RoHS and REACH status should be verified using current manufacturer documentation
• Safety Certifications: Applicable UL, CSA, and other approvals should be confirmed through the manufacturer's latest certification records

Where It Works Best

• Industrial Motors
• Transformers
• Service Entrance Equipment
• Main and Feeder Circuits
• General-Purpose Branch Circuits
• Solenoids and Electromagnetic Equipment
• Fluorescent Lighting Systems
• Electrical System Upgrades
• Equipment with High Inrush Currents