KLLU900 - 900Amp Fuse

KLLU900 - 900Amp Fuse

When your equipment calls for a 900A Class L time-delay fuse, amperage is only part of the match. The KLLU900 combines a 900A continuous current rating with Class L construction, current-limiting performance, and bolt-in mounting. Its current-limiting design is intended to reduce short-circuit damage to systems and equipment. For replacement or equipment-matching, confirm the full KLLU900 specification—including fuse class, voltage, interrupting capacity, time-delay characteristics, and bolt-in configuration—rather than selecting based on the 900A rating alone.

Key Features and Benefits

• 900A continuous current rating for equipment specifically designed around a 900-amp Class L fuse.
• Time-delay operation helps accommodate temporary high starting currents associated with large motors and other inductive loads.
• Manufacturer specifies a minimum 10-second time delay at 500% of the fuse rating.
• 600VAC maximum voltage rating with a 200,000A interrupting rating at 600VAC.
• Current-limiting design helps reduce short-circuit damage to electrical systems and equipment.
• Manufacturer guidance specifically identifies motor branch-circuit protection as an application for properly selected KLLU fuses.
• Bolt-in construction and mounting provide the physical format required by equipment designed for this type of Class L fuse.
• Non-indicating design for installations that specify a standard fuse without a visual indication feature.

Technical Specifications

• Catalog Number: KLLU900
  
• Manufacturer Description: FUS 600V T/D CLASS L 900A
  
• Series: KLLU
  
• Product Type: Time-Delay Current-Limiting Fuse
  
• Continuous Current Rating: 900A
  
• 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 information for the KLLU900 also confirms its 900A continuous rating, Class L designation, current-limiting family style, time-delay opening characteristic, and bolt-in configuration.

Where It Works Best

The KLLU900 900A Class L fuse suits electrical equipment designed for a 900A, time-delay, current-limiting Class L fuse with bolt-in mounting. The manufacturer specifically describes KLLU fuses for motor branch-circuit protection, where properly selected fuses may be sized close to motor full-load current to protect branch-circuit conductors, motor control equipment, and motors. The specified minimum 10-second time delay at 500% of rating also makes this series relevant for large motors and other inductive loads that produce heavy starting currents.