KLLU750 - 750Amp Fuse

KLLU750 - 750Amp Fuse

When your equipment calls for a 750A Class L time-delay fuse, matching the amperage is just the beginning. The KLLU750 is a 750-amp, current-limiting Class L fuse with a bolt-in design, a maximum rating of 600VAC and 300VDC, and time-delay operation intended to accommodate demanding startup conditions. If you're replacing an existing KLLU750, confirm the complete specification—not just 750A—including Class L construction, time-delay characteristics, AC/DC ratings, interrupting capacity, and bolt-in mounting.

Key Features and Benefits

• 750A continuous current rating for equipment specifically designed around a 750-amp Class L fuse.
• Time-delay opening characteristic helps accommodate temporary high-current conditions associated with large motor starting and other inductive loads.
• Manufacturer specifies a minimum 10-second time delay at 500% of the rated current.
• Rated for electrical systems up to 600VAC when all application requirements are met.
• Current-limiting design helps reduce damage to systems and equipment during short-circuit conditions.
• The manufacturer identifies motor branch-circuit protection as an appropriate KLLU Series application when the fuse is properly sized and applied.
• Bolt-in construction provides a defined mounting configuration for equipment compatibility checks.
• Non-indicating configuration for applications calling for a standard non-indicating Class L fuse.

Technical Specifications

• Catalog Number: KLLU750
  
• Manufacturer Description: FUS 600V T/D CLASS L 750A
  
• Series: KLLU
  
• Product Type: Time-Delay Current-Limiting Fuse
  
• Continuous Current Rating: 750A
  
• Maximum AC Voltage: 600VAC
  
• Maximum DC Voltage: 300VDC
  
• AC Interrupting Rating: 200,000A at 600VAC
  
• DC Interrupting Rating: 20,000A at 300VDC
  
• Opening Characteristic: Slo-Blo / Time Lag (T) / Time Delay
  
• Specified Time Delay: Minimum 10 seconds at 500% of rated current
  
• Fuse Class: Class L
  
• Family Style: Current Limiting
  
• Construction / Size: Bolt-In
  
• Indicating: No
  
• Mounting Method: Bolt-In
  

Material Compliance and Certifications

The manufacturer identifies the KLLU Series as UL Listed and states that its time-delay Class L fuses meet or exceed UL requirements for Class L fuses. The supplied KLLU750 information further confirms its 750A continuous current rating, Class L classification, current-limiting family style, time-delay opening characteristic, and bolt-in configuration.

Where It Works Best

The KLLU750 750A Class L fuse suits electrical equipment that requires a 750A, time-delay, current-limiting Class L fuse with bolt-in mounting. The manufacturer's application guidance specifically includes motor branch-circuit protection, where properly selected KLLU fuses may be sized close to motor full-load current to protect branch-circuit conductors, motor control equipment, and motors.