KLLU1000 - 1000Amp Fuse

KLLU1000 - 1000Amp Fuse

When you're matching a 1000A Class L fuse, the amperage on the label is only the beginning. The KLLU1000 is a 1000-amp, time-delay, current-limiting Class L fuse with a bolt-in design, rated for up to 600VAC and 300VDC. The manufacturer also identifies the KLLU Series as UL Listed and states that it meets or exceeds UL requirements for Class L fuses. If you're evaluating the KLLU1000 as a replacement, don't match on 1000A alone—confirm the Class L designation, voltage, interrupting ratings, time-delay characteristics, bolt-in configuration, and equipment requirements before selecting.

Key Features and Benefits

• 1000A continuous current rating for equipment designed around a 1000-amp Class L fuse
• Class L fuse design with manufacturer-stated compliance with applicable UL Class L requirements
• Time-delay operation helps accommodate temporary starting currents rather than treating every brief current increase the same way
• Provides a minimum 10-second time delay at 500% of rating, according to the manufacturer
• 600VAC maximum voltage rating
• 300VDC maximum voltage rating
• The manufacturer specifies a current-limiting design to reduce short-circuit damage to systems and equipment
• Manufacturer describes selective-coordination capabilities with other Class L fuses and compatible current-limiting fuses rated 600A or less
• Bolt-in construction and mounting provide clear physical characteristics to check when matching an existing installation
• Non-indicating configuration should be verified when replacing an existing fuse

Technical Specifications

• Catalog Number: KLLU1000
  
• Manufacturer Description: FUS 600V T/D CLASS L 1000A
  
• Series: KLLU
  
• Product Type: Class L Time-Delay Current-Limiting Fuse
  
• Continuous Current Rating: 1000A
  
• 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
  
• Time-Delay Characteristic: Minimum 10 seconds at 500% of rating, as specified for the KLLU Series
  
• 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 fuses meet or exceed all UL requirements for Class L fuses. The supplied information also confirms the KLLU1000's Class L designation, current-limiting family style, electrical ratings, time-delay opening characteristic, and bolt-in construction.

Where It Works Best

The KLLU1000 suits electrical equipment designed for a 1000A Class L, time-delay, bolt-in fuse with the corresponding voltage and interrupting requirements. Its manufacturer-described time-delay behavior makes it particularly relevant where temporary starting currents are part of normal operation, including qualifying large-motor and other inductive-load applications. The manufacturer specifically states that KLLU fuses may be used for motor branch-circuit protection and that the time delay helps prevent unnecessary downtime caused by heavy motor starting currents.