LLNRK050 - 50Amp Fuse

LLNRK050 - 50Amp Fuse

Motors and transformers don't always play nice with ordinary fuses. When they start up, they can draw a sudden rush of current that may cause an unnecessary fuse opening. The Littelfuse LLNRK050 50 Amp Class RK1 time-delay fuse is designed to handle those brief surges while still protecting your equipment when a genuine electrical fault occurs. Part of the Littelfuse POWR-PRO™ series, this dual-element fuse uses a spring-loaded thermal overload element to provide the time delay needed for equipment with high startup currents.

Key Features and Benefits

• 50 Amp Current Rating
• 250V AC / 125V DC Ratings
• Class RK1 Current-Limiting Protection
• High Interrupting Capacity
• Dual-Element Time-Delay Design
• Fewer Nuisance Openings
• Low-Resistance Construction
• Flexible Mounting

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLNRK050
  
• Product Series: LLNRK
  
• Product Family: POWR-PRO™
  
• Product Type: Current-Limiting Time-Delay Fuse
  
• Fuse Class: Class RK1
  
• Continuous Current Rating: 50 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 the manufacturer
  
• 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
  
• Fuse Block Compatibility: Suitable for Class RK1 and compatible existing Class H fuse blocks
  

Material Compliance and Certifications

The Littelfuse LLNRK050 is part of the POWR-PRO Class RK1 fuse family, built for electrical circuits that need dependable overload and short-circuit protection.

• Material Compliance: Verify RoHS and REACH status using current Littelfuse documentation.
• Safety Certifications: Confirm applicable UL, CSA, and other approvals through the manufacturer's latest certification records.

If your installation has specific compliance requirements, check the manufacturer's current documentation before selecting the fuse.

Where It Works Best

• Industrial Motors
• Transformers
• Main and Feeder Circuits
• Service Entrance Equipment
• General-Purpose Circuits
• Solenoids
• Fluorescent Lighting
• Electrical System Upgrades