LLSRK125ID - 125Amp Fuse

LLSRK125ID - 125Amp Fuse

When your fuse opens, your maintenance team doesn't need a guessing game. Finding the problem quickly can make all the difference between a short interruption and hours of lost productivity. That's where the Littelfuse LLSRK125ID comes in.

Part of the Littelfuse POWR-PRO LLSRK_ID series, this 125-amp Class RK1 time-delay indicating fuse combines dependable overcurrent protection with a feature technicians will appreciate: a built-in indicator window that darkens when the fuse opens. Instead of spending unnecessary time checking individual fuses, your team gets a clear visual clue that helps narrow down the problem.

Key Features and Benefits

• 125A Class RK1 Time-Delay Protection
• Easy-to-See Blown-Fuse Indicator
• Patented Indicator™ Technology
• Current-Limiting Fuse Design
• High Short-Circuit Interrupting Capacity
• Precision-Formed Short-Circuit Elements
• Solid-State Overload Section
• No Moving Parts in the Overload Section
• Helps Reduce Nuisance Fuse Openings
• Handles Brief Motor Startup Surges
• Faster Fault Identification
• Knife-Blade Terminals
• Compatible Fuse Block and Holder Mounting
• Flexible Use Across Industrial Applications

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLSRK125ID
  
• Series: LLSRK_ID
  
• Product Family: POWR-PRO
  
• Product Type: Industrial Cartridge Fuse
  
• Fuse Class: Class RK1
  
• Continuous Current Rating: 125A
  
• Maximum AC Voltage: 600V AC
  
• Maximum DC Voltage: 300V DC
  
• Opening Characteristic: Slo-Blo / Time Lag (T) / Time Delay
  
• Terminal Style: Knife-Blade
  
• Blown-Fuse Indicator: Yes
  
• AC Interrupting Rating: 200,000A at 600V AC
  
• Additional AC Interrupting Rating: 300,000A at 600V AC, subject to applicable manufacturer rating conditions
  
• DC Interrupting Rating: 20,000A at 300V DC
  
• Short-Circuit Elements: Precision-formed
  
• Overload Section: Solid-state, without moving parts
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Associated Fuse Holder Series: LFR60200 Series
  

Material Compliance and Certifications

The supplied product specifications did not include specific UL or CSA certification listings, RoHS compliance status, REACH declarations, or material composition details. Where documented approvals or material compliance are required, verify the applicable manufacturer's documentation for the exact LLSRK125ID catalog number.

As with any electrical protection device, select the fuse based on the circuit's voltage, current, available fault current, equipment requirements, and applicable electrical codes.

Where It Works Best

The LLSRK125ID makes sense in applications where temporary current surges are part of everyday operation, but reliable protection against actual electrical faults is essential. Its indicating feature is especially useful in facilities where maintenance teams need to identify an opened fuse without wasting time.

• Industrial Motor Circuits
• Manufacturing Machinery
• Factory Electrical Equipment
• Industrial Control Panels
• Commercial Electrical Systems
• Equipment with Temporary Startup Surges
• Maintenance and Replacement Applications
• High Available Fault-Current Circuits
• Compatible Fuse Blocks and Holders
• Facilities Requiring Faster Troubleshooting