JLLS1200 - 1200 Amp Fuse

JLLS1200 - 1200 Amp Fuse

When your application calls for a 1200-amp Class T fuse, getting the complete specification right matters. The Littelfuse JLLS1200 combines a 1200A continuous current rating with fast-acting operation, current-limiting characteristics, and a Knife-Blade/Bolt-In configuration. Built to last, its clearly defined Class T designation, electrical ratings, opening characteristic, and physical format make it easier to determine whether this is the correct fuse for your equipment—not simply one that happens to share the same amperage.

Key Features and Benefits

• 1200A continuous current rating: Provides a clearly defined amperage specification for equipment requiring a 1200-amp fuse.
• Class T fuse: The fuse class provides an essential compatibility checkpoint when identifying a replacement or matching equipment requirements.
• Fast-acting opening: Littelfuse identifies the JLLS1200 as Fast-Acting (F), so there is no need to guess about its opening characteristic.
• Current-limiting design: Manufacturer specifications place the JLLS1200 in the current-limiting family.
• Knife-blade-style construction: Provides an important physical detail for matching the fuse with compatible equipment.
• Knife-Blade/Bolt-In configuration: Helps narrow compatibility beyond catalog number and amperage alone.
• Non-indicating: Littelfuse specifies the JLLS1200 as a non-indicating fuse.

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: JLLS1200
  
• Series: JLLS
  
• Manufacturer Description: FUS 600V 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: 600VAC
  
• Maximum DC Voltage: 300VDC
  
• AC Interrupting Rating: 200,000A (200 kA) at 600VAC
  
• DC Interrupting Rating: 20,000A (20 kA) at 300VDC
  
• Construction: Knife-blade style
  
• Size: Knife-Blade/Bolt-In
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  

Material Compliance and Certifications

The supplied manufacturer specifications do not identify specific UL, CSA, CE, RoHS, REACH, or other certification or material-compliance information for the JLLS1200. That does not mean the product lacks a particular certification or compliance status; it simply means those details were not provided in the source information supplied here. If a particular listing, certification, or material requirement matters, verify the fuse markings and current authoritative manufacturer documentation.

Where It Works Best

The Littelfuse JLLS1200 1200A Class T fuse is best suited to compatible electrical equipment specifically calling for a 1200A, fast-acting, current-limiting Class T fuse with knife-blade-style construction. Its Knife-Blade/Bolt-In configuration makes the physical format an important part of the match. At the same time, the 600VAC / 300VDC maximum voltage ratings and corresponding interrupting ratings provide additional electrical specifications to check against the equipment requirements.