FLSR500 - 500Amp Fuse

FLSR500 - 500Amp Fuse

Need to replace a 500A Class RK5 fuse and want to make sure the details line up? The FLSR500 combines a 500-amp continuous rating with time-delay operation, dual-element construction, and a knife-blade design. It is rated for applications up to 600V AC and 300V DC, making voltage just as important to check as amperage when you're matching a replacement.

Key Features and Benefits

• 500A continuous current rating – Built for equipment and circuits specifically requiring 500-amp overcurrent protection.
• Class RK5 configuration – An important specification to verify when replacing an existing Class RK5 fuse.
• Time-delay operation – The Slo-Blo / Time Lag (T) characteristic accommodates appropriate temporary startup and inrush currents within the fuse's operating characteristics.
• Dual-element construction – Works together with the time-delay design to provide the specified FLSR operating behavior.
• Knife-blade construction – Made to install in compatible fuse blocks, clips, and holders.
• Non-indicating version – Useful to know at a glance when you're comparing the replacement against an existing fuse specification.
  

Technical Specifications

• Catalog Number: FLSR500
  
• Series: FLSR
  
• Fuse Type: Dual-Element Time-Delay Fuse
  
• Fuse Class: Class RK5
  
• Continuous Current Rating: 500A
  
• Maximum AC Voltage: 600V AC
  
• Maximum DC Voltage: 300V DC
  
• Opening Characteristic: Slo-Blo / Time Lag (T) / Time Delay
  
• Family Style: Dual Element Fuse
  
• Construction / Size: Knife-Blade
  
• Indicating: No
  
• DC Interrupting Rating: 20,000A (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: LFR60600 Series
  

Material Compliance and Certifications

The supplied product specifications identify the FLSR500 as a Class RK5 fuse. They do not, however, provide catalog-specific UL, CSA, RoHS, or other certification and material-compliance declarations. Rather than guessing at those details, they should be confirmed against documentation for the exact FLSR500 catalog number when a particular approval or compliance standard is required.

Where It Works Best

The FLSR500 makes sense when the equipment specification calls for a 500A Class RK5 time-delay fuse with knife-blade construction. Its time-delay characteristic is particularly relevant in properly specified circuits where brief increases in current can occur during startup or normal operation. Those temporary conditions aren't the same as a sustained overcurrent, which is why matching the required opening characteristic is important.

It's also a straightforward fuse to identify during replacement work. Check for 500A, Class RK5, 600V AC maximum, 300V DC maximum, dual-element time-delay operation, knife-blade construction, and a non-indicating configuration. The supplied specifications identify mounting via a compatible fuse block, clip, or holder, as well as the LFR60600 Series holder family.