JLLN1200 - 1200Amp Fuse

JLLN1200 - 1200Amp Fuse

With a 1200-amp Class T fuse, the details matter—and the Littelfuse JLLN1200 gives you a specific set of ratings to verify against your equipment. This fast-acting, current-limiting fuse is rated for up to 300VAC and 125VDC, with an interrupting capacity of 200 kA at 300VAC and 20 kA at 125VDC. The JLLN1200 is non-indicating and is designed for mounting in a compatible fuse block, clip, or holder, with the LSCR Series identified by Littelfuse as the PG holder. It's a focused electrical component built to last when correctly selected, installed, and operated within its specified ratings.

Key Features and Benefits

• 1200A continuous current rating: Clearly specified for applications requiring a 1200-amp Class T fuse.
• Fast-acting operation: The JLLN1200 carries Littelfuse's Fast-Acting (F) opening designation, making this characteristic easy to verify during fuse selection.
• Current-limiting design: Identified as part of Littelfuse's current-limiting fuse family.
• Class T configuration: Provides a defined fuse classification to match equipment requirements.
• 300VAC maximum voltage: Rated for AC applications up to the manufacturer's specified 300VAC maximum.
• 125VDC maximum voltage: Carries a separate maximum DC rating of 125VDC.
• Knife-blade/bolt-in construction: Provides maintenance personnel and buyers with a key physical characteristic to confirm compatibility.
• Non-indicating fuse: Manufacturer data specifies that the JLLN1200 does not include an indicating function.

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: JLLN1200
  
• Series: JLLN
  
• Manufacturer Title: FUS 300V F/A CLASS T 1200A
  
• Continuous Current Rating: 1200A
  
• 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
  
• Construction / Size: Knife-Blade/Bolt-In
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• PG Holder: LSCR Series
  

Material Compliance and Certifications

The manufacturer specifications provided for the JLLN1200 did not include specific UL, CSA, CE, RoHS, REACH, or other certification or material-compliance information. That doesn't mean the product lacks a particular certification; it simply means you shouldn't claim one based on the information available here. For applications that require a specific approval or material-compliance standard, confirm it with authoritative documentation for the exact JLLN1200 catalog number.

Where It Works Best

The Littelfuse JLLN1200 is best suited for compatible electrical equipment that calls for a 1200A Class T, fast-acting, current-limiting fuse with knife-blade/bolt-in construction. Match the voltage and interrupting ratings to the application: 200 kA at 300VAC for the specified AC rating and 20 kA at 125VDC for the specified DC rating. The equipment's mounting arrangement should also meet the manufacturer's requirements for the fuse block, clip, or holder.