FLSR450-ID - 450Amp Fuse

FLSR450-ID - 450Amp Fuse

At 450 amps, fuse selection leaves little room for "close enough." The FLSR450-ID is a 450A Class RK5 dual-element time-delay fuse with an indicating design, knife-blade construction, and ratings up to 600V AC and 300V DC. The FLSR450-ID also carries a 20 kA interrupting rating at 300V DC, while the supplied manufacturer specifications list AC interrupt-amperage values of 200 kA and 300 kA at 600V AC under applicable rating conditions. If you're matching an existing FLSR450-ID, verify the entire specification—not merely the 450A number on the label.

Key Features and Benefits

• 450A continuous current rating – Made for equipment and circuits specifically requiring a 450-amp Class RK5 fuse.
• Class RK5 construction – Gives maintenance professionals an important fuse-class specification for accurate replacement matching.
• Time-delay operation – Helps accommodate appropriate temporary inrush and startup currents rather than behaving like a fast-acting fuse.
• Dual-element fuse design – Provides the operating characteristics associated with the FLSR-ID time-delay family.
• Indicating configuration – Useful during maintenance and troubleshooting when technicians need to determine fuse status.
• Knife-blade style – Configured for installation with compatible fuse blocks, clips, and holders.
  

Technical Specifications

• Catalog Number: FLSR450-ID
  
• Manufacturer Reference: FLSR450ID
  
• Series: FLSR_ID
  
• Product Type: Dual-Element Time-Delay Fuse
  
• Fuse Class: Class RK5
  
• Continuous Current Rating: 450A
  
• Maximum AC Voltage: 600V AC
  
• Maximum DC Voltage: 300V DC
  
• Opening Characteristic: Slo-Blo / Time Lag (T) / Time Delay
  
• Construction: Knife-Blade
  
• Family Style: Dual Element Fuse
  
• Indicating: Yes
  
• 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 manufacturer information identifies the FLSR450-ID as a Class RK5 fuse. Still, it does not provide enough catalog-specific information to accurately state individual UL, CSA, RoHS, or other certification and material-compliance declarations.

Where It Works Best

The FLSR450-ID makes sense in properly engineered electrical systems calling for a 450A, 600V AC Class RK5 time-delay fuse, particularly where brief startup or inrush current is part of normal equipment operation. Its time-delay characteristic allows appropriate temporary increases in current within its specified time-current behavior, rather than opening like a fast-acting fuse.

There is also a practical distinction in maintenance here. The "-ID" version indicates, making it especially useful in installations where easier fuse-status checking can help technicians during inspection and troubleshooting. That's worth confirming during replacement work; a fuse with the same 450A rating but a different indicating configuration isn't necessarily the same component.