JLLN300 - 300Amp Fuse

JLLN300 - 300Amp Fuse

The Littelfuse JLLN300 is defined by a combination of specifications that makes it easier to determine whether it belongs in your application: 300 amps, Class T, fast-acting operation, current-limiting characteristics, and knife-blade/bolt-in construction. For maintenance or replacement work, these details give you concrete points to check rather than relying on amperage or appearance alone.

Key Features and Benefits

• 300A continuous current rating: Provides a clear starting point when matching the fuse to equipment requirements.
• Class T fuse: The fuse class provides an essential compatibility detail for identifying the correct component.
• Fast-acting operation: Littelfuse specifies the opening characteristic as Fast-Acting (F).
• Current-limiting design: A manufacturer-specified characteristic that should be matched to the requirements of the application.
• 300VAC maximum rating: Designed for compatible applications operating within its stated 300VAC limit.
• 125VDC maximum rating: Also specified for compatible DC applications up to 125VDC.
• Knife-blade/bolt-in construction: Gives technicians another physical characteristic to confirm when identifying the correct fuse.
• Non-indicating: The JLLN300 does not include an indicating feature.

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: JLLN300
  
• Series: JLLN
  
• Manufacturer Description: FUS 300V F/A CLASS T 300A
  
• Continuous Current Rating: 300A
  
• Fuse Class: Class T
  
• Opening Characteristic: Fast-Acting (F)
  
• Family Style: Current Limiting
  
• Maximum AC Voltage: 300VAC
  
• Maximum DC Voltage: 125VDC
  
• AC Interrupting Rating: 200,000A (200 kA) at 300VAC
  
• DC Interrupting Rating: 20,000A (20 kA) at 125VDC
  
• Size / Construction: Knife-Blade/Bolt-In
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• PG Holder: LFT30400 Series
  

Material Compliance and Certifications

The supplied manufacturer specifications do not state specific UL, CSA, CE, RoHS, REACH, or other material-compliance or certification information for the JLLN300. That does not establish that the product lacks any of these certifications or compliance designations. When an installation requires a particular approval, confirm it using current, authoritative Littelfuse documentation and the markings on the actual fuse.

Where It Works Best

The Littelfuse JLLN300 300A Class T fuse suits compatible electrical equipment that requires a 300A fast-acting, current-limiting Class T fuse with knife-blade/bolt-in construction. Its clearly defined AC and DC ratings make specification matching straightforward: 300VAC with a 200 kA interrupting rating, or 125VDC with a 20 kA interrupting rating, depending on the application. The specified fuse block, clip, or holder mounting method should also agree with the equipment configuration.