FLSR450 - 450Amp Fuse

FLSR450 - 450Amp Fuse

The FLSR450 is a 450A, 600V AC Class R time-delay fuse designed for electrical systems that require high current capacity and substantial fault-current interruption. For maintenance teams replacing an existing FLSR450, the important details go well beyond the 450-amp rating: this is a non-indicating, knife-blade Class R fuse with a 600V AC rating and specific physical dimensions. That combination matters when you're trying to match an existing installation accurately rather than choosing a fuse based on amperage alone.

Key Features and Benefits

• 450A rating – Matches applications specifically requiring a 450-amp fuse.
• 600V AC rating – Intended for properly specified AC systems operating within the fuse's published voltage rating.
• Time-delay operation – Allows appropriate short-duration inrush or startup current without the response characteristics of a fast-acting fuse.
• Current-limiting Class R design – Helps limit fault-current energy during applicable overcurrent conditions.
• Knife-blade style – Provides the physical configuration required for compatible fuse mounting equipment.
• Non-indicating configuration – Important to know when matching the FLSR450 to an existing fuse specification.
  

Technical Specifications

• Part Number: FLSR450
  
• Type: FLSR
  
• Product Type: Time-Delay Current-Limiting Fuse
  
• Amperage: 450A
  
• Voltage Rating: 600V AC
  
• A.I.C. Rating: 200 kA at 600V AC
  
• Fuse Class: Class R
  
• Operating Characteristic: Time-Delay
  
• Style: Knife-Blade
  
• Indicating: No
  
• Current-Limiting: Yes
  
• Height: 13.38
  
• Width: 3.04
  
• Depth: 3.04
  

Material Compliance and Certifications

The available product information identifies the FLSR450 as a current-limiting Class R fuse, but it does not provide catalog-specific material-compliance declarations or individual certification listings. Rather than assume approvals based on similar products in the FLSR family, any required UL, CSA, RoHS, or other certification or material-compliance documentation should be confirmed for the exact FLSR450 part number.

Where It Works Best

The FLSR450 450A fuse is best suited to electrical installations that specifically require a 600V AC, 450A Class R current-limiting fuse with time-delay characteristics. The time-delay response is useful in properly engineered circuits where brief inrush or startup currents are expected during normal operation and should not be treated the same way as a sustained overcurrent condition.