LLSRK250ID - 250Amp Fuse

LLSRK250ID - 250Amp Fuse

When equipment shuts down, finding the problem is usually the first challenge. If a fuse has opened, you want to know which one without spending extra time checking every fuse in the panel.

The Littelfuse LLSRK250ID helps make that job easier. It's a 250-amp Class RK1 time-delay fuse with a built-in indicator window that darkens when the fuse opens. That gives maintenance technicians a quick visual clue about where to start troubleshooting.

Part of the Littelfuse POWR-PRO LLSRK_ID series, this fuse is rated for 600V AC and 300V DC applications. It also uses precision-formed short-circuit elements and a solid-state overload section with no moving parts.

Key Features and Benefits

• Blown-fuse indication you can actually see.
• 250A Class RK1 protection.
• Time-delay performance.
• Fewer nuisance openings.
• Current-limiting design.
• No moving parts in the overload section.
• Practical knife-blade construction.
• Useful across different applications.

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLSRK250ID
  
• Series: LLSRK_ID
  
• Product Family: POWR-PRO Fuse
  
• Fuse Class: Class RK1
  
• Continuous Current Rating: 250A
  
• Maximum AC Voltage: 600V AC
  
• Maximum DC Voltage: 300V DC
  
• Opening Characteristic: Slo-Blo / Time Lag (T) / Time Delay
  
• Terminal Style: Knife-Blade
  
• Indicating Fuse: Yes
  
• AC Interrupting Rating: 200,000A at 600V AC
  
• Additional AC Interrupting Rating: 300,000A at 600V AC, subject to manufacturer rating conditions
  
• DC Interrupting Rating: 20,000A at 300V DC
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Associated Holder Series: LFR60400 Series
  
• Short-Circuit Elements: Precision-Formed
  
• Overload Section: Solid-State, No Moving Parts
  

Material Compliance and Certifications

The supplied product data did not include specific UL and CSA certification details, RoHS and REACH declarations, or material composition information. If your project requires those details, they should be confirmed against current Littelfuse documentation for this exact catalog number.

Before installation, verify that the fuse meets the circuit's voltage, current, available fault current, and equipment requirements—the correct fuse class and holder compatibility matter as much as the amp rating.

Where It Works Best

• Industrial Motor Circuits
• Manufacturing Equipment
• Industrial Control Panels
• Commercial and Industrial Electrical Systems
• Facilities With Demanding Maintenance Schedules
• Compatible Fuse Blocks and Holders