KLLU800 - 800Amp Fuse

KLLU800 - 800Amp Fuse

An 800A fuse is only the right replacement when your electrical and physical requirements line up, too. The KLLU800 is a Class L, time-delay, current-limiting fuse rated for 800A continuous current, with a maximum voltage of 600VAC and 300VDC, and a bolt-in mounting configuration. Its current-limiting design also helps reduce short-circuit damage to systems and equipment. For replacement work, check the full KLLU800 specification—Class L, 800A rating, voltage, interrupting capacity, time-delay characteristics, and bolt-in mounting—rather than relying on amperage alone.

Key Features and Benefits

• 800A continuous current rating for electrical equipment designed around an 800-amp Class L fuse.
• Class L time-delay operation helps handle temporary starting currents without unnecessarily opening during normal equipment startup.
• Manufacturer specifies a minimum 10-second time delay at 500% of rated current, an important characteristic for large motors and other inductive loads.
• Rated for systems up to 600VAC and 300VDC, subject to the applicable interrupting ratings and equipment requirements.
• Current-limiting construction reduces short-circuit damage to electrical systems and equipment.
• The manufacturer identifies motor branch-circuit protection as an application for properly selected KLLU fuses.
• Bolt-in mounting provides the physical configuration required by equipment designed for this Class L fuse format.
• Non-indicating design for installations that call for a standard non-indicating fuse.

Technical Specifications

• Catalog Number: KLLU800
  
• Manufacturer Description: FUS 600V T/D CLASS L 800A
  
• Series: KLLU
  
• Product Type: Time-Delay Current-Limiting Fuse
  
• Continuous Current Rating: 800A
  
• 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 these time-delay Class L fuses meet or exceed UL requirements for Class L fuses. For the KLLU800 specifically, the supplied information confirms its Class L classification, 800A continuous rating, current-limiting family style, time-delay opening characteristic, and bolt-in mounting.

Where It Works Best

The KLLU800 800A Class L fuse is best suited to electrical equipment specifically designed for an 800A, time-delay, current-limiting Class L fuse with bolt-in mounting. The manufacturer's guidance specifically addresses motor branch-circuit protection. It states that KLLU fuses may be sized close to motor full-load current when properly applied to protect branch-circuit conductors, motor control equipment, and motors. The minimum 10-second time delay at 500% of rating also makes the series particularly relevant where large motors or other inductive loads produce substantial starting current.