KLLU1200 - 1200Amp Fuse

KLLU1200 - 1200Amp Fuse

At 1200 amps, getting the fuse specifications right means looking beyond the current rating alone. The KLLU1200 is a 1200A Class L, time-delay, current-limiting fuse in a bolt-in configuration for equipment that requires this specific combination of electrical and physical characteristics. The manufacturer also identifies the KLLU Series as UL Listed and meeting or exceeding UL requirements for Class L fuses. When you're replacing or specifying a KLLU1200, check the entire specification—not just 1200A—including fuse class, AC or DC voltage, interrupting rating, time-delay characteristics, and bolt-in mounting.

Key Features and Benefits

• 1200A continuous current rating for electrical equipment specifically designed around a 1200-amp Class L fuse.
• Class L construction provides a clearly defined fuse type for accurate replacement matching.
• The time-delay opening characteristic accommodates temporary current increases associated with starting conditions.
• The KLLU Series provides a minimum 10-second time delay at 500% of its rating, according to the manufacturer.
• Rated for a maximum of 600VAC, giving buyers a clear AC specification to match against their equipment.
• The manufacturer specifies a current-limiting design to reduce short-circuit damage to systems and equipment.
• The manufacturer describes KLLU fuses as offering selective coordination with other Class L fuses and applicable current-limiting fuses rated 600A or less.
• Bolt-in construction and mounting make physical installation requirements straightforward to identify when checking compatibility.
• Confirm the non-indicating design against the requirements of the existing equipment or specified replacement.

Technical Specifications

• Catalog Number: KLLU1200
  
• Manufacturer Description: FUS 600V T/D CLASS L 1200A
  
• Series: KLLU
  
• Product Type: Class L Time-Delay Current-Limiting Fuse
  
• Continuous Current Rating: 1200A
  
• 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 the series meets or exceeds all UL requirements for Class L fuses. The supplied product information also confirms the KLLU1200's Class L designation, current-limiting family style, time-delay opening characteristic, electrical ratings, and bolt-in construction.

Where It Works Best

The KLLU1200 suits electrical equipment that requires a 1200A Class L, time-delay, current-limiting fuse with bolt-in mounting. Its manufacturer-specified time-delay behavior is particularly relevant in properly engineered circuits with expected temporary starting currents, including qualifying large-motor and other inductive-load applications. For motor branch-circuit protection, the manufacturer states that KLLU fuses may be sized close to motor full-load current, subject to application requirements.