JLLS300 - 300Amp Fuse

JLLS300 - 300Amp Fuse

The JLLS300 is a 300-amp Class T fast-acting fuse designed for your electrical systems that require high interrupting capacity, current-limiting performance, and a compact Class T configuration. Rated for up to 600VAC and 300VDC, this fuse provides a 200 kA AC interrupting rating and a 20 kA interrupting rating at 300VDC. Whether you're replacing an existing JLLS300 or specifying protection for equipment designed around a 300A, 600V Class T fuse, the clearly defined electrical ratings make it easier to confirm compatibility before installation.

Key Features and Benefits

• 300A continuous current rating for electrical equipment designed around 300-amp Class T protection.
• 600VAC maximum voltage rating supports compatible commercial and industrial AC applications.
• Rated up to 300VDC for properly specified DC circuits.
• Fast-acting (F) operation provides overcurrent protection without an intentional time delay.
• Current-limiting design helps limit fault-current energy during qualifying overcurrent conditions.
• Class T configuration combines high interrupting capacity with a space-efficient fuse format.
• Knife-blade/bolt-in construction for use with compatible mounting hardware.
• Non-indicating design for applications where a visual blown-fuse indicator is not required.
• Mounts using an appropriate fuse block, clip, or holder.
• LFT60400 Series is the specified holder family for the JLLS300.

Technical Specifications

• Catalog Number: JLLS300
  
• Series: JLLS
  
• Product Type: Class T Fuse
  
• Continuous Current Rating: 300A
  
• 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 JLLS300 belongs to the JLLS family of Class T, fast-acting, current-limiting fuses. The supplied manufacturer specifications clearly identify its electrical ratings, fuse class, opening characteristic, mounting method, and interrupting capacities.

Where It Works Best

The JLLS300 300A Class T fuse is best suited to commercial and industrial electrical equipment specifically engineered for a 300-amp, fast-acting Class T fuse. Its 600VAC rating, current-limiting operation, compact Class T format, and 200 kA AC interrupting capacity make it suitable for compatible power distribution equipment, disconnects, electrical panels, industrial machinery, and other systems that require these electrical characteristics.