LLNRK004 - 4Amp Fuse

LLNRK004 - 4Amp Fuse

When you need to replace a fuse, getting the details right matters. The Littelfuse LLNRK004 is a 4-amp, Class RK1 time-delay fuse from the Littelfuse POWR-PRO LLNRK series, designed to protect compatible electrical circuits against overloads and short circuits. With a maximum voltage rating of 250VAC or 125VDC, it combines Slo-Blo time-delay operation with defined interrupting ratings for electrical systems that require dependable overcurrent protection.

Key Features and Benefits

• 4A continuous current rating: Provides overcurrent protection for compatible circuits requiring a 4-amp fuse.
• Class RK1 fuse design: Meets the fuse-class requirements of applications specified for Class RK1 protection.
• AC and DC voltage ratings: Rated for applications up to 250VAC or 125VDC, provided the circuit meets the applicable electrical and interrupting requirements.
• Non-indicating construction: Identified by the manufacturer as a non-indicating fuse.
• Compatible mounting options: Designed for installation in suitable fuse blocks, clips, and holders.

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLNRK004
  
• Series: LLNRK
  
• Product Family: POWR-PRO
  
• Product Type: Time-Delay Fuse
  
• Fuse Class: Class RK1
  
• Continuous Current Rating: 4A
  
• Maximum AC Voltage: 250VAC
  
• Maximum DC Voltage: 125VDC
  
• Standard AC Interrupting Rating: 200,000A (200 kA) RMS symmetrical at 250VAC
  
• Additional AC Interrupting Rating: 300,000A (300 kA) RMS symmetrical at 250VAC, self-certified by Littelfuse
  
• DC Interrupting Rating: 20,000A (20 kA) at 125VDC, self-certified by Littelfuse
  
• Opening Characteristic: Slow-Blow / Time Lag (T) / Time Delay
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Manufacturer-Referenced Holder Series: LFR25030
  

Material Compliance and Certifications

Littelfuse's LLNRK/LLSRK series documentation identifies the following approvals and ratings:

• UL Listed: Manufacturer series documentation references UL File E81895.
• CSA Certified: Manufacturer series documentation references CSA File LR29862.
• AC Interrupting Rating: 200 kA RMS symmetrical at 250VAC, with an additional 300 kA rating self-certified by Littelfuse.
• DC Interrupting Rating: 20 kA at 125VDC, self-certified by Littelfuse.

Where It Works Most

The Littelfuse LLNRK004 4A fuse is intended for electrical applications requiring Class RK1 time-delay overcurrent protection. Littelfuse identifies the LLNRK series for use in compatible service entrance, main, feeder, and general-purpose branch circuits.