LLNRK020 - 20Amp Fuse

LLNRK020 - 20Amp Fuse

When your motor starts or a transformer energizes, the initial current surge can be much higher than the normal operating load. That's how many electrical systems work. The trick is choosing a fuse that distinguishes a brief, expected surge from an electrical condition that requires protection. The Littelfuse LLNRK020 20 Amp Class RK1 Time-Delay Fuse is designed with that distinction in mind.

A defining feature of the LLNRK020 fuse is its two-element construction. Littelfuse incorporates a thermally reversible, spring-loaded thermal overload element to help provide the delay needed during temporary current surges. For maintenance teams and electrical contractors, this matters because unnecessary fuse openings can interrupt otherwise normal equipment operation. The correct time-delay fuse can reduce those interruptions when properly coordinated with the circuit's load characteristics.

Key Features and Benefits

• 20 Amp Continuous Current Rating
• 250VAC Maximum Voltage Rating
• 125VDC Maximum Voltage Rating
• Class RK1 Fuse Classification
• Littelfuse POWR-PRO Family
• LLNRK Series Design
• Slo-Blo Time-Delay Operation
• Dual-Element Fuse Construction
• Spring-Loaded Thermal Overload Element
• Current-Limiting Protection
• Short-Circuit Protection
• Sustained Overload Protection
• Temporary Inrush Current Accommodation
• Reduced Unnecessary Fuse Opening

Technical Specifications

• Catalog Number: LLNRK020
  
• Manufacturer: Littelfuse
  
• Product Category: Current-Limiting Time-Delay Fuse
  
• Product Family: POWR-PRO
  
• Series: LLNRK
  
• Fuse Class: Class RK1
  
• Continuous Current Rating: 20 Amps
  
• Maximum AC Voltage: 250VAC
  
• Maximum DC Voltage: 125VDC
  
• Opening Characteristic: Slo-Blo / Time Lag (T) / Time Delay
  
• Fuse Construction: Dual Element
  
• Thermal Overload Element: Thermally Reversible, Spring-Loaded
  
• AC Interrupting Value 1: 200,000 Amps at 250VAC
  
• AC Interrupting Value 2: 300,000 Amps at 250VAC
  
• DC Interrupting Rating: 20,000 Amps at 125VDC
  
• Current-Limiting Design: Yes
  
• Indicating Feature: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Manufacturer-Identified Holder Series: LFR25030
  

Material Compliance and Certifications

The supplied product information does not specify the exact body material, terminal material, or individual material-compliance declarations for LLNRK020. It also does not provide specific UL or CSA certification file numbers or individual certification markings. Verify these details through current manufacturer documentation and the markings on the actual product when required for installation.

Where It Works Best

• General-Purpose Electrical Circuits
• Motor Circuits
• Transformer Circuits
• Solenoid Circuits
• Fluorescent Lighting Circuits
• Equipment with High Inrush Currents
• Commercial Electrical Distribution
• Industrial Electrical Distribution
• Service Entrance Applications
• Compatible Class RK1 Fuse Holders
• Compatible Existing Class H Fuse Blocks
• LFR25030 Series Fuse Holders