LLNRK150 - 150Amp Fuse

LLNRK150 - 150Amp Fuse

A blown fuse can stop production, interrupt critical equipment, and turn an ordinary workday into an expensive troubleshooting session. But not every surge of electrical current signals a problem. Motors need extra power to start, transformers experience temporary inrush currents when energized, and other inductive equipment can briefly draw more current than during normal operation. Part of the Littelfuse POWR-PRO™ family, this dual-element, current-limiting fuse combines time-delay operation with high interrupting capacity to protect your valuable equipment without unnecessary interruptions during normal startup.

Rated for 150 amps, 250V AC, and 125V DC, the LLNRK150 is well suited for appropriately rated industrial and commercial electrical systems, including service entrance equipment, main distribution circuits, feeders, and general-purpose branch circuits. Its two-element construction includes a thermally reversible, spring-loaded thermal overload element that helps accommodate temporary inrush currents while responding to sustained overload conditions.

Key Features and Benefits

• 150 Amp Continuous Current Rating
• 250V AC / 125V DC Voltage Ratings
• Class RK1 Current-Limiting Protection
• Up to 300,000A AC Interrupting Rating
• Dual-Element Time-Delay Design
• Reduced Nuisance Fuse Openings
• Thermally Reversible Overload Element
• Spring-Loaded Thermal Protection
• Low-Resistance Construction
• Non-Indicating Design
• Fuse Block, Clip, or Holder Mounting

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLNRK150
  
• Product Series: LLNRK
  
• Product Family: POWR-PRO™
  
• Product Type: Current-Limiting Time-Delay Fuse
  
• Fuse Class: Class RK1
  
• Continuous Current Rating: 150 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
  
• Current-Limiting Design: Yes
  
• Fuse Indication: Non-Indicating
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Compatible Holder Series: LFR25200
  
• Fuse Block Compatibility: Suitable for Class RK1 fuse blocks and compatible existing Class H fuse blocks
  

Material Compliance and Certifications

The Littelfuse LLNRK150 belongs to the POWR-PRO Class RK1 fuse family and is designed for electrical systems requiring current-limiting short-circuit protection and time-delay overload performance.

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

For projects with specific material restrictions, certification requirements, or electrical inspection criteria, consult the latest manufacturer documentation before selecting the fuse.

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 Equipment
• Compatible Class H Fuse System Upgrades