LLNRK175 - 175Amp Fuse

LLNRK175 - 175Amp Fuse

When your electrical equipment starts up, a temporary current surge is often normal. Motors, transformers, and other inductive loads can draw much more current during startup than once they're running. The challenge? Protecting those circuits against dangerous overloads and short circuits without having a fuse open every time equipment starts. The Littelfuse LLNRK175 175 Amp Class RK1 time-delay fuse is engineered to handle that balance. As part of the Littelfuse POWR-PRO™ series, it combines dual-element time-delay operation with exceptional current-limiting performance to help safeguard electrical equipment while reducing unnecessary interruptions.

Key Features and Benefits

• 175 Amp Continuous Current Rating
• 250V AC and 125V DC Voltage Ratings
• Class RK1 Current-Limiting Protection
• High AC Interrupting Capacity Up to 300,000 Amps
• Dual-Element Time-Delay Construction
• Reduced Nuisance Fuse Openings During Normal Startup
• Thermally Reversible Overload Element
• Spring-Loaded Thermal Protection
• Low-Resistance Design
• Protection for High-Inrush Equipment

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLNRK175
  
• Series: LLNRK
  
• Product Family: POWR-PRO™
  
• Product Type: Dual-Element, Current-Limiting Time-Delay Fuse
  
• Fuse Classification: Class RK1
  
• Continuous Current Rating: 175 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
  
• Thermal Overload Element: Thermally Reversible, Spring-Loaded
  
• Current-Limiting: Yes
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Compatible Holder Series: LFR25200
  
• Fuse Block Compatibility: Appropriately rated Class RK1 fuse blocks and compatible existing Class H fuse blocks
  

Material Compliance and Certifications

The Littelfuse LLNRK175 is part of the POWR-PRO Class RK1 fuse family, designed to provide current-limiting short-circuit protection and time-delay overload performance in suitable electrical systems.

• Material Compliance: Verify current RoHS and REACH declarations with Littelfuse
• Safety Certifications: Confirm applicable UL, CSA, and other approvals using current manufacturer documentation

For installations requiring specific regulatory approvals, environmental declarations, or material restrictions, review the latest manufacturer documentation.

Where It Works Best

• Industrial Motor Circuits
• Transformers
• Service Entrance Equipment
• Main Electrical Distribution Circuits
• Feeder Circuits
• General-Purpose Branch Circuits
• Solenoids
• Fluorescent Lighting Systems
• High-Inrush Electrical Equipment
• Industrial Control Systems
• Compatible Class H Fuse Block Upgrades