KLLU601 - 601 Amp Fuse

KLLU601 - 601 Amp Fuse

The KLLU601 is a 601A Class L time-delay fuse built for electrical equipment that requires high-current protection, current-limiting performance, and a bolt-in connection. Its current-limiting characteristics are designed to reduce short-circuit damage to electrical systems and equipment. The manufacturer also identifies the KLLU Series as UL Listed and meeting or exceeding UL requirements for Class L fuses. If you're replacing an existing KLLU601, don't stop at matching the 601A rating—confirm the Class L requirement, AC or DC voltage, available fault current, time-delay characteristics, and bolt-in mounting before installation.

Key Features and Benefits

• 601A continuous current rating for systems specifically designed around a 601-amp Class L fuse.
• The Class L fuse configuration narrows the compatibility check when replacing or specifying a fuse.
• Time-delay operation is intended to accommodate temporary starting currents rather than reacting unnecessarily to normal startup conditions.
• The manufacturer specifies a minimum 10-second time delay at 500% of rated current, particularly relevant to large motors and other inductive loads.
• Current-limiting performance is designed to reduce short-circuit damage to systems and connected equipment.
• Rated for operation up to 600VAC.
• Also rated for systems up to 300VDC, provided the remaining application requirements are satisfied.
• Bolt-in construction and mounting provide a clearly defined physical format to check against the existing installation.
• Non-indicating design for equipment requiring a standard non-indicating Class L fuse.

Technical Specifications

• Catalog Number: KLLU601
  
• Manufacturer Description: FUS 600V T/D CLASS L 601A
  
• Series: KLLU
  
• Product Type: Time-Delay Current-Limiting Fuse
  
• Continuous Current Rating: 601A
  
• 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 specifications identify the KLLU601 as a 601A, current-limiting, time-delay Class L fuse with bolt-in construction.

Where It Works Best

The KLLU601 601A Class L fuse best matches electrical equipment that requires a 601A, time-delay, current-limiting Class L fuse with bolt-in mounting. The manufacturer identifies motor branch-circuit protection as an application for KLLU fuses and states that they may be sized close to motor full-load current when properly applied. The minimum 10-second time delay at 500% of rating is intended to help accommodate the heavy starting currents encountered with large motors and other inductive loads. In contrast, the current-limiting design is intended to reduce short-circuit damage.