LLSRK225ID - 225Amp Fuse

LLSRK225ID - 225Amp Fuse

When your fuse opens in the middle of a busy workday, the last thing anyone needs is a lengthy search to figure out which one failed. Equipment is down, work is piling up, and maintenance crews need answers.

That's where the Littelfuse LLSRK225ID comes in. This 225-amp Class RK1 time-delay indicating fuse combines high-capacity electrical protection with a simple troubleshooting feature: a built-in indicator window that darkens when the fuse opens. Instead of starting from scratch, technicians have a visible clue that helps them identify the affected fuse.

But there's more to this fuse than its indicator. Motors and other industrial equipment often draw extra current briefly when starting or cycling. That doesn't always mean there's a problem. The LLSRK225ID uses a time-delay design to accommodate these normal, temporary surges while still protecting against sustained overloads and short circuits.

Key Features and Benefits

• 225A Class RK1 Protection
• Built-In Blown-Fuse Indicator
• Patented Indicator™ Technology
• Time-Delay Operation
• Current-Limiting Design
• High Interrupting Capacity
• Precision-Formed Short-Circuit Elements
• Solid-State Overload Section
• No Spring-Loaded Overload Mechanism
• Improved Cycling Characteristics
• Reduced Nuisance Openings

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLSRK225ID
  
• Series: LLSRK_ID
  
• Product Family: POWR-PRO
  
• Product Type: Industrial Cartridge Fuse
  
• Fuse Class: Class RK1
  
• Continuous Current Rating: 225A
  
• 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 Indication: 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, No Moving Parts
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Associated Fuse Holder Series: LFR60400 Series
  

Material Compliance and Certifications

The Littelfuse LLSRK225ID belongs to the POWR-PRO LLSRK_ID family of Class RK1 time-delay indicating fuses. Its manufacturer specifications identify the electrical ratings, construction features, and operating characteristics relevant to product selection.

The information provided does not establish the exact UL or CSA certification listings, RoHS or REACH compliance status, or detailed material composition for this catalog number.

Where It Works Best

• Industrial Motor Circuits
• Manufacturing Machinery
• Industrial Control Panels
• Commercial Electrical Equipment
• Motor-Driven Equipment
• Frequently Cycled Machinery
• Industrial Maintenance Applications
• High Fault-Current Circuits
• Compatible Fuse Blocks and Holders
• Facilities Where Downtime Matters