FLSR004 - 4 Amp Fuse

FLSR004 - 4 Amp Fuse

When your circuit has normal startup current but still needs dependable overcurrent protection, the FLSR004 4A Class RK5 time-delay fuse is built for the job. This dual-element industrial cartridge fuse is rated for 4 amps, up to 600 VAC and 300 VDC, making it suitable for a range of motor, transformer, feeder, and general-purpose circuit applications. Its time-delay characteristic is an important part of the design. Rather than opening simply because a motor or other inductive load produces a brief, expected inrush current, the FLSR004 can accommodate those temporary conditions when properly sized for the circuit.

Key Features and Benefits

• 4-amp rating – Designed for applications requiring a 4A Class RK5 fuse.
• Time-delay operation – Helps accommodate temporary startup and inrush currents without sacrificing protection against sustained overload conditions.
• Dual-element design – Combines time-delay performance with effective overcurrent protection.
• 600VAC / 300VDC rated – Suitable for compatible AC and DC applications within its specified ratings.
• Current-limiting protection – Helps limit fault current during qualifying short-circuit conditions.
• Class RK5 construction – Designed to the applicable UL 248-12 Class RK5 requirements.
• Industrial cartridge style – Made for use with compatible fuse blocks, clips, and holders.
  

Technical Specifications

• Catalog Number: FLSR004
  
• Series: FLSR
  
• Fuse Type: Dual-Element Time-Delay Fuse
  
• Fuse Class: Class RK5
  
• Current Rating: 4A
  
• Maximum AC Voltage: 600VAC
  
• Maximum DC Voltage: 300VDC
  
• Opening: Slo-Blo / Time Lag (T) / Time Delay
  
• Size / Style: Industrial Cartridge
  
• Family Style: Dual Element Fuse
  
• Indicating: No
  
• AC Interrupting Rating: 200 kA RMS Symmetrical
  
• Additional AC Interrupting Rating: 300 kA RMS Symmetrical, Manufacturer Self-Certified
  
• DC Interrupting Rating: 20 kA
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Compatible Holder: LFR60030 Series
  
• Applicable Standard: UL 248-12, Class RK5
  

Material Compliance and Certifications

The FLSR004 is part of the Class RK5 fuse series, manufactured to meet recognized industrial circuit-protection requirements. Manufacturer documentation identifies the series as UL Listed under File E81895 and CSA Certified under File LR29862, with the FLSR Series specified to UL 248-12 Class RK5 requirements.

For an application that requires a specific environmental or material declaration, such as RoHS or REACH documentation, the current compliance documentation for the exact FLSR004 catalog number should be confirmed before specifying the fuse.

Where It Works Best

The FLSR004 makes the most sense in electrical systems where a little patience during startup is a good thing. Motors and transformers, for example, can briefly draw considerably more current when energized than they do during normal operation. A properly selected time-delay fuse is designed to handle that temporary inrush while remaining ready to respond to an actual overload or short circuit.

Typical FLSR Series applications include motor branch circuits, motor control center mains, transformers, switchboard mains and feeders, service entrance switches, and general-purpose circuits. The 4A rating also makes the FLSR004 useful when maintaining or replacing an existing fuse in equipment specifically designed around this amperage and fuse class.