FLSR225 - 225 Amp Fuse

FLSR225 - 225 Amp Fuse

Need to replace a 225A Class RK5 fuse? The FLSR225 offers a specific combination of ratings worth checking before you make the swap. It is a 225-amp, 600V AC Class RK5 time-delay fuse with dual-element construction and a knife-blade design. The FLSR225 is also rated up to 300V DC, with a 20 kA interrupting rating at 300V DC, and it installs in a compatible fuse block, clip, or holder. If you're replacing an existing FLSR225, don't match on amperage alone—the Class RK5 designation, voltage, time-delay characteristic, interrupting requirements, knife-blade configuration, and mounting arrangement all deserve a quick check.

Key Features and Benefits

• 225A continuous current rating – Made for applications specifically calling for a 225-amp fuse.
• 600 V AC maximum rating – Suitable for compatible AC equipment operating within the published voltage range.
• 300V DC maximum rating – Can also be used in correctly specified DC applications up to 300V.
• Class RK5 construction – An essential specification to check when you're matching an existing fuse or equipment requirement.
• Time-delay performance – Helps accommodate appropriate temporary startup and inrush currents that could cause a fast-acting fuse to open sooner.
• Dual-element design – Delivers the operating characteristics associated with this time-delay fuse family.
• Knife-blade style – Fits compatible fuse blocks, clips, and holders designed for this configuration.
• Non-indicating design – The standard FLSR225 does not include an indication feature.
  

Technical Specifications

• Catalog Number: FLSR225
  
• Series: FLSR
  
• Fuse Class: Class RK5
  
• Fuse Type: Dual-Element Time-Delay Fuse
  
• Continuous Current Rating: 225A
  
• Maximum AC Voltage: 600V AC
  
• Maximum DC Voltage: 300V DC
  
• Opening: Slo-Blo / Time Lag (T) / Time Delay
  
• Size / Configuration: Knife-Blade
  
• Family Style: Dual Element Fuse
  
• Indicating: No
  
• DC Interrupting Rating: 20 kA at 300V DC
  
• Manufacturer-Listed AC Interrupt Amperage: 200,000A and 300,000A at 600V AC*
  
• Mounting Method: Fuse Block / Clip / Holder
  
• PG Holder: LFR60400 Series
  

Material Compliance and Certifications

For the FLSR225, the supplied product information confirms it is Class RK5. Still, it does not provide enough catalog-specific information to accurately list individual UL, CSA, RoHS, or other certification and material-compliance declarations.

For a job where a particular certification or material standard is mandatory, check the current documentation for the exact FLSR225 before installation. That's especially important with electrical protection products—you want the certification attached to the exact catalog number you're using, not an assumption based on a similar fuse in the same family.

Where It Works Best

The FLSR225 is best considered when the equipment specification calls for a 225A, Class RK5, time-delay fuse with a knife-blade configuration. Its time-delay behavior becomes particularly useful in correctly matched equipment where a temporary rise in current is normal during startup or operation. Instead of treating every brief current increase like an immediate reason to open, the time-delay characteristic provides tolerance for appropriate short-duration inrush.