FLSR250 - 250Amp Fuse

FLSR250 - 250Amp Fuse

Need a 250A Class RK5 fuse and want to make sure you're matching more than just the amp rating? The FLSR250 combines a 250-amp continuous rating, 600V AC / 300V DC capability, dual-element construction, and time-delay operation in a knife-blade fuse. Its Slo-Blo characteristics allow appropriate short-duration startup or inrush current to pass without the fuse opening unnecessarily, while still providing overcurrent protection within its specified ratings. This particular FLSR250 is the non-indicating version, so that's worth checking when you're replacing an existing fuse.

Key Features and Benefits

• 250A continuous rating – Matches equipment and circuits that specifically call for a 250-amp Class RK5 fuse.
• Up to 600V AC – Suitable for compatible AC applications within the published voltage rating.
• 300V DC rating – Adds flexibility for correctly specified DC applications up to 300V.
• Slo-Blo / time-delay operation – Helps handle appropriate short-duration startup and inrush currents without nuisance opening.
• Dual-element construction – Gives the FLSR250 its time-delay operating characteristics.
• Class RK5 fuse – An important specification when replacing or matching existing circuit protection.
• Knife-blade design – Fits compatible fuse blocks, clips, and holders designed for this configuration.
• Non-indicating version – A useful detail to verify when matching an existing FLSR250 installation.
  

Technical Specifications

• Catalog Number: FLSR250
  
• Series: FLSR
  
• Fuse Type: Dual-Element Fuse
  
• Fuse Class: Class RK5
  
• Continuous Current Rating: 250A
  
• Maximum AC Voltage: 600V AC
  
• Maximum DC Voltage: 300V DC
  
• Opening Characteristic: Slo-Blo / Time Lag (T) / Time Delay
  
• Construction: Knife-Blade
  
• 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

The supplied product information identifies the FLSR250 as a Class RK5 fuse. Specific UL, CSA, RoHS, or other catalog-level certifications and material-compliance declarations were not included in the information provided, so they shouldn't be assumed to apply to similar products in the FLSR family.

Where It Works Best

The FLSR250 is a practical choice when the equipment specification calls for a 250A Class RK5 time-delay fuse rated up to 600V AC or 300V DC. Its time-delay characteristics are especially useful in properly specified circuits where brief startup or inrush currents are a normal part of operation.

It's also well suited to replacement work where an existing FLSR250 250A fuse needs to be matched accurately. That's where it's easy to focus on the big “250A” marking and overlook the rest. Check the RK5 class, voltage rating, time-delay operation, interrupting capacity, knife-blade configuration, and non-indicating design as well.