JLS400 - 400 Amp Fuse

JLS400 - 400 Amp Fuse

Choosing a 400A Class J fuse takes more than matching the amperage printed on the fuse. The JLS400 is a 400-amp fast-acting fuse rated for operation up to 600VAC, with a 200 kA interrupting rating at 600VAC. If you're checking the JLS400 as a replacement, compare the complete set of requirements—400A current rating, Class J classification, 600VAC maximum voltage, fast-acting opening characteristic, interrupting rating, knife-blade format, and mounting arrangement. That full-spec approach gives you a much clearer compatibility check than relying on amperage alone.

Key Features and Benefits

• 400A continuous current rating for equipment requiring a 400-amp Class J fuse
• Maximum voltage rating of 600VAC
• Fast-acting (F) opening characteristic
• Class J fuse classification
• Part of the JLS current-limiting fuse family
• Knife-blade construction for the specified physical configuration
• Non-indicating design
• Mounts using a compatible fuse block, clip, or holder
• LFJ60400 Series specified as the corresponding holder family
• Clearly defined electrical and physical specifications help simplify replacement compatibility checks

Technical Specifications

• Catalog Number: JLS400
  
• Series: JLS
  
• Product Type: Class J Fuse
  
• Continuous Current Rating: 400A
  
• Maximum AC Voltage: 600VAC
  
• Interrupting Rating: 200 kA at 600VAC
  
• Interrupt Amperage: 200,000A
  
• Interrupt Voltage Type: AC
  
• Interrupt Voltage: 600VAC
  
• Opening Characteristic: Fast-Acting (F)
  
• Fuse Class: Class J
  
• Family Style: Current Limiting
  
• Construction / Size: Knife-Blade
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Specified Holder Series: LFJ60400 Series
  

Material Compliance and Certifications

The supplied manufacturer specifications identify the JLS400 as a 400A Class J fast-acting fuse with a current-limiting, family-style design. They also specify a 600VAC maximum voltage rating, a 200 kA interrupting rating at 600VAC, knife-blade construction, a non-indicating design, and the mounting configuration.

Where It Works Best

The JLS400 400A fuse suits electrical equipment that requires a 400A fast-acting Class J fuse and matches the JLS400's electrical and physical characteristics. For AC applications, confirm that the equipment requirements fall within the 600VAC maximum voltage rating and are compatible with the specified 200 kA interrupting rating at 600VAC.