KLLU650 - 650Amp Fuse

KLLU650 - 650Amp Fuse

When your equipment calls for a 650A Class L time-delay fuse, matching the amperage is only the beginning. The KLLU650 is a current-limiting, bolt-in fuse rated for up to 600VAC and 300VDC, with an AC interrupting rating of 200,000A at 600VAC and a DC interrupting rating of 20,000A at 300VDC. The current-limiting design reduces short-circuit damage to electrical systems and equipment, while the defined Class L, bolt-in configuration gives maintenance teams clear electrical and physical requirements to verify during replacement. The manufacturer also identifies the KLLU Series as UL Listed and states that it meets or exceeds UL requirements for Class L fuses.

Key Features and Benefits

• 650A continuous current rating for equipment specifically designed around a 650-amp Class L fuse.
• Time-delay opening characteristic helps accommodate temporary high current associated with equipment startup.
• The manufacturer specifies a minimum 10-second time delay at 500% of rated current, which is particularly useful with large motors and other inductive loads.
• The current-limiting design reduces short-circuit damage to electrical systems and equipment.
• Rated for applications up to 600VAC when all other system requirements are satisfied.
• Also rated up to 300VDC, providing flexibility where the specified DC ratings match the application.
• Bolt-in construction provides a defined mounting format that can be checked directly against the existing equipment.
• Non-indicating design for installations requiring a standard non-indicating Class L fuse.

Technical Specifications

• Catalog Number: KLLU650
  
• Manufacturer Description: FUS 600V T/D CLASS L 650A
  
• Series: KLLU
  
• Product Type: Time-Delay Current-Limiting Fuse
  
• Continuous Current Rating: 650A
  
• 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. The supplied product data further identifies the KLLU650 as a 650A, current-limiting, time-delay Class L fuse with bolt-in construction.

Where It Works Best

The KLLU650 650A Class L fuse suits electrical equipment that requires a 650A, time-delay, current-limiting Class L fuse with bolt-in mounting. The manufacturer identifies motor branch-circuit protection as an application for the KLLU Series and states that these fuses may be sized close to motor full-load current when properly applied. That makes the specified time-delay behavior particularly relevant around large motors and other inductive loads, where heavy starting current can occur during normal operation.