JLLN800 - 800Amp Fuse

JLLN800 - 800Amp Fuse

When you're matching an 800-amp fuse to existing electrical equipment, the catalog number matters—but the electrical ratings and physical configuration complete the compatibility check. The Littelfuse JLLN800 is a Class T, fast-acting, current-limiting fuse with an 800A continuous current rating and knife-blade/bolt-in construction. When correctly matched to equipment requiring these exact characteristics, the JLLN800 is a focused electrical component built to last when properly installed and operated within its specified ratings.

Key Features and Benefits

• 800A continuous current rating: Clearly identifies the amperage for applications specifically requiring a 700-series JLLN fuse rated at 800 amps.
• Class T configuration: Provides an essential compatibility checkpoint when identifying a replacement or maintenance fuse.
• Fast-acting operation: Littelfuse designates the JLLN800 as Fast-Acting (F).
• Current-limiting design: The manufacturer-listed family style provides another key characteristic to match against equipment requirements.
• 300VAC maximum rating: Suitable for compatible applications requiring a fuse rated for up to 300VAC.
• 125VDC maximum rating: Also carries a separately specified maximum DC voltage of 125VDC.
• Knife-blade/bolt-in construction: Provides a defined physical format to verify against existing equipment.
• Non-indicating design: Littelfuse specifies the JLLN800 as a non-indicating fuse.

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: JLLN800
  
• Series: JLLN
  
• Manufacturer Description: FUS 300V F/A CLASS T 800A
  
• Continuous Current Rating: 800A
  
• 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: LSCR Series
  

Material Compliance and Certifications

The supplied manufacturer information does not specify UL, CSA, CE, RoHS, REACH, or other material-compliance or certification details for the JLLN800. This should not be interpreted to mean the fuse lacks a particular approval. If a certification or material-compliance requirement is important for your installation, confirm it against current authoritative Littelfuse documentation and the markings on the actual product.

Where It Works Best

The Littelfuse JLLN800 800A Class T fuse is best suited for compatible electrical equipment that requires an 800A, fast-acting, current-limiting Class T fuse with knife-blade/bolt-in construction. It is particularly straightforward to evaluate when existing equipment documentation provides the required fuse class, amperage, AC or DC voltage, interrupting capacity, and physical configuration.