FLSR090 - 90Amp Fuse

FLSR090 - 90Amp Fuse

Motors and transformers can ask a lot from a circuit the moment they're switched on. That brief current jump is normal, but it still has to be accounted for when selecting the right fuse. The FLSR090 is a 90A Class RK5 time-delay fuse made for applications where temporary startup current is expected. Its dual-element design gives the fuse time-delay characteristics, allowing appropriate short-duration inrush to pass while still protecting against sustained overloads and short circuits. If you're matching an existing fuse or working from an equipment specification that calls for 90A, Class RK5, time-delay protection, those details make the FLSR090 worth a closer look.

Key Features and Benefits

• 90A continuous rating for circuits specified for 90-amp fuse protection.
• Class RK5 dual-element construction provides time-delay operation for compatible electrical loads.
• Rated up to 600VAC and 300VDC.
• Slo-Blo / time-delay response helps accommodate appropriate short-term startup and inrush current.
• Protects against sustained overloads and short circuits when properly applied.
• Knife-blade construction is designed for use with the appropriate fuse block, clip, or holder.
• Non-indicating design for applications where built-in fuse-status indication isn't required.
• Specified with the LFR60100 Series PG holder.
  

Technical Specifications

• Catalog Number: FLSR090
  
• Series: FLSR
  
• Fuse Class: Class RK5
  
• Family Style: Dual Element Fuse
  
• Continuous Current Rating: 90A
  
• Maximum AC Voltage: 600VAC
  
• Maximum DC Voltage: 300VDC
  
• Opening: Slo-Blo / Time Lag (T) / Time Delay
  
• AC Interrupt Amperage: 200,000A at 600VAC
  
• Additional Manufacturer-Specified AC Interrupt Amperage: 300,000A at 600VAC
  
• DC Interrupting Rating: 20,000A at 300VDC
  
• Size / Construction: Knife-Blade
  
• Indicating: No
  
• Mounting: Fuse Block / Clip / Holder
  
• PG Holder: LFR60100 Series
  

Material Compliance and Certifications

The FLSR090 is identified as a Class RK5 fuse. That's an important part of the specification, but it isn't the only detail to check when matching a fuse to an electrical system. Current, voltage, interrupting capacity, opening characteristics, and physical configuration matter too.

If your project requires specific UL, CSA, RoHS, REACH, environmental, or material-compliance documentation, verify the current documentation for the FLSR090 itself. That avoids assuming a particular approval or declaration applies simply because it appears on another fuse within the same product family.

Where It Works Best

The FLSR090 is particularly useful when a short burst of higher current is simply part of getting the equipment running. A motor is a good example. Starting current can be considerably higher than normal running current, yet that doesn't necessarily indicate an electrical problem. Transformers can also experience an initial inrush when energized.

That's the kind of situation where a time-delay fuse earns its place. The FLSR090 can tolerate appropriate short-duration inrush while remaining available to respond when an overload continues, or a short circuit develops.