JLLS400 - 400Amp Fuse

JLLS400 - 400Amp Fuse

The JLLS400 is a 400-amp Class T fast-acting fuse for electrical equipment that requires a current-limiting fuse with high interrupting capacity. With ratings up to 600VAC and 300VDC, this fuse combines a 200 kA AC interrupting rating with a 20 kA interrupting rating at 300VDC. If you're replacing an existing JLLS400, don't rely on the 400A rating alone. Confirm the fuse class, AC or DC voltage, interrupting rating, opening characteristic, mounting arrangement, and equipment requirements before replacing it. Those details are what distinguish the correct 400A Class T fuse from another fuse that may look similar on paper.

Key Features and Benefits

• 400A continuous current rating for equipment specified for a 400-amp fuse.
• 600VAC maximum voltage rating for compatible AC electrical systems.
• Rated up to 300VDC for properly specified DC applications.
• Fast-acting (F) opening characteristic with no intentional time delay.
• Class T current-limiting design for applications requiring this fuse class and operating style.
• Knife-blade/bolt-in construction provides the physical configuration specified for this model.
• Non-indicating design; the fuse does not include a built-in blown-fuse indicator.
• Designed for installation in a compatible fuse block, clip, or holder.

Technical Specifications

• Catalog Number: JLLS400
  
• Series: JLLS
  
• Product Type: Class T Fuse
  
• Continuous Current Rating: 400A
  
• Maximum AC Voltage: 600VAC
  
• Maximum DC Voltage: 300VDC
  
• AC Interrupting Rating: 200 kA at 600VAC
  
• DC Interrupting Rating: 20 kA at 300VDC
  
• Opening Characteristic: Fast-Acting (F)
  
• Fuse Class: Class T
  
• Family / Style: Current Limiting
  
• Size / Construction: Knife-Blade / Bolt-In
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Specified Holder Series: LFT60400 Series
  

Material Compliance and Certifications

The supplied manufacturer specifications identify the JLLS400 as a Class T, fast-acting, current-limiting fuse and provide its principal electrical and mounting characteristics. However, the information supplied for this product does not specify material composition, RoHS compliance, or individual UL/CSA certification or file numbers.

Where It Works Best

The JLLS400 400A Class T fuse is best suited to electrical equipment engineered to use a 400A fast-acting Class T fuse rated up to 600VAC. Its 200 kA AC interrupting capacity is an important selection point when the equipment and electrical system require that level of interrupting capability.

It can also be used in appropriately specified DC applications up to 300VDC, subject to its 20 kA DC interrupting rating and equipment requirements. The JLLS400's knife-blade/bolt-in construction means physical compatibility matters just as much as the electrical numbers.