LLSRK300ID - 300Amp Fuse

LLSRK300ID - 300Amp Fuse

A machine stops running. The maintenance crew opens the electrical panel, and now the search begins. Is it a blown fuse? And if so, which one? The Littelfuse LLSRK300ID makes that first question a little easier to answer. This 300A Class RK1 time-delay indicating fuse has a built-in window that darkens when the fuse opens. It's a small feature, but when you're trying to get equipment running again, being able to spot an opened fuse without checking each one individually is a real advantage.

Key Features and Benefits

• Easy-to-see blown-fuse indicator
• 300-amp current rating
• Time-delay protection
• Helps reduce nuisance fuse openings
• Current-limiting design
• No moving parts in the overload section
• High interrupting capacity
• Easier troubleshooting and maintenance
• Knife-blade construction
• Suitable for a variety of industrial applications

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: LLSRK300ID
  
• Series: LLSRK_ID
  
• Product Family: POWR-PRO Fuse
  
• Fuse Class: Class RK1
  
• Continuous Current Rating: 300A
  
• 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 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 manufacturer specifications cover its electrical ratings and operating characteristics. However, specific UL and CSA certification details, RoHS and REACH declarations, and material composition information were not provided.

Where It Works Best

• Industrial Motor Circuits
• Manufacturing and Production Equipment
• Industrial Control Panels
• Commercial and Industrial Electrical Systems
• Facilities With Frequent Equipment Startups
• Maintenance-Intensive Operations
• Compatible Fuse Blocks and Holders