FLSR500-ID - 500 Amp Fuse

FLSR500-ID - 500 Amp Fuse

Replacing a 500A fuse isn’t something you want to do by matching the amp rating and calling it done. The FLSR500-ID is a 500A Class RK5 indicating time-delay fuse with a 600V AC maximum rating, 300V DC maximum rating, and knife-blade construction. What makes this particular model stand out is the combination of dual-element time-delay operation and an indicating design. Whether you’re replacing an existing fuse during scheduled maintenance or matching a component to an equipment specification, checking the fuse class, voltage, interrupting requirements, indicating style, and physical configuration helps ensure you’re getting the right part—not simply another 500A fuse.

Key Features and Benefits

• 500A continuous current rating – Made for applications specifically calling for 500-amp fuse protection.
• Class RK5 configuration – An important specification to match when replacing a fuse in equipment designed around Class RK5 protection.
• Time-delay performance – Slo-Blo / Time Lag (T) operation accommodates appropriate temporary startup and inrush currents within the fuse’s specified time-current characteristics.
• Indicating design – Helps distinguish this model from the non-indicating FLSR500 when identifying the correct replacement.
• Dual-element fuse – Combines dual-element construction with time-delay operation.
• Knife-blade construction – Intended for a compatible fuse block, clip, or holder.
  

Technical Specifications

• Catalog Number: FLSR500-ID
  
• Manufacturer Reference: FLSR500ID
  
• Series: FLSR_ID
  
• Fuse Type: Indicating Time-Delay Fuse
  
• Fuse Class: Class RK5
  
• 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
  
• Size / Construction: Knife-Blade
  
• Indicating: Yes
  
• 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: LFR60600 Series
  

Material Compliance and Certifications

When you’re dealing with a high-amperage fuse, assumptions about certifications aren’t worth making. The supplied product information identifies the FLSR500-ID as a Class RK5 fuse, but it does not include catalog-specific UL, CSA, RoHS, or other compliance details.

Where It Works Best

The FLSR500-ID makes the most sense in electrical systems specifically calling for a 500A, Class RK5, time-delay indicating fuse. Its time-delay operation is particularly relevant in properly engineered circuits where normal equipment operation can produce brief startup or inrush currents that should not result in unnecessary fuse opening.

It’s also a useful choice when the indicating version is part of the equipment specification. That detail is easy to overlook when two fuse catalog numbers look almost identical, so maintenance teams should confirm the complete model designation before replacement.