KLLU1800 - 1800Amp Fuse

KLLU1800 - 1800Amp Fuse

When your equipment calls for an 1800A Class L fuse, amperage is only the first specification to check. The KLLU1800 is a 1800-amp time-delay, current-limiting fuse with bolt-in construction, a maximum rating of 600VAC or 300VDC, and a 200,000A interrupting rating at 600VAC. Its current-limiting design is intended to reduce short-circuit damage to equipment and electrical systems. The manufacturer identifies the KLLU Series as UL Listed and states that it meets or exceeds UL requirements for Class L fuses. For replacement work, match the full electrical and physical specifications—including fuse class, voltage, interrupting capacity, time-delay characteristic, and bolt-in mounting—rather than relying on the 1800A rating alone.

Key Features and Benefits

• 1800A continuous current rating for equipment designed around an 1800-amp Class L fuse.
• Class L fuse design provides a clearly defined electrical and physical class to verify when selecting a replacement.
• Time-delay operation helps accommodate temporary current increases associated with startup conditions.
• The KLLU Series has a minimum 10-second time delay at 500% of its current rating, helping avoid unnecessary fuse operation from heavy starting currents of large motors and other inductive loads.
• Current-limiting performance is designed to reduce short-circuit damage to systems and equipment.
• Rated for AC systems up to 600VAC.
• Rated for DC applications up to 300VDC, provided all equipment and circuit requirements are compatible.
• Bolt-in construction and mounting provide a specific physical configuration that should match the existing equipment.
• Confirm the non-indicating design when replacing an existing fuse.

Technical Specifications

• Catalog Number: KLLU1800
  
• Manufacturer Description: FUS 600V T/D CLASS L 1800A
  
• Series: KLLU
  
• Product Type: Time-Delay Current-Limiting Fuse
  
• Continuous Current Rating: 1800A
  
• 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
  
• Series Time-Delay Characteristic: 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 KLLU Series fuses meet or exceed UL requirements for Class L fuses. The supplied KLLU1800 information also confirms its Class L designation, current-limiting family style, time-delay opening characteristic, voltage ratings, interrupting ratings, and bolt-in construction.

Where It Works Best

The KLLU1800 best matches electrical equipment designed for an 1800A Class L time-delay, current-limiting fuse with bolt-in mounting. The manufacturer specifically discusses the KLLU Series in connection with motor branch-circuit protection, and its minimum 10-second time delay at 500% of rating is intended to accommodate heavy starting currents associated with large motors and other inductive loads.