Littelfuse FLSR 5 FLSR005 Fuse

The Littelfuse FLSR 5 is a high-performance Class RK5 fuse engineered for industrial HVACR applications requiring superior overcurrent protection. With a 5 Amp fuse rating and a dual-element design, this 600V time delay fuse provides the necessary thermal inertia to handle temporary inductive surges and motor startup currents without nuisance tripping. Rated for both 600 VAC and 300 VDC, the FLSR005 features a 200,000 Amp RMS symmetrical interrupting rating, effectively limiting peak let-through current to protect downstream branch circuit components and sensitive control transformers.

As a dual-element time delay fuse, it offers significant current-limiting capabilities, reducing the risk of arc flash incidents and mechanical damage during short-circuit events. The physical industrial cartridge dimensions ensure compatibility with standard RK5 fuse blocks and disconnect switches. For technicians managing commercial refrigeration or air conditioning plants, integrating the Littelfuse FLSR series ensures Type 2 "No Damage" protection for motor controllers and simplifies selective coordination in complex electrical distributions.

Key Benefits for HVACR Applications

• Enhanced Motor Protection: The Slo-Blo/Time Lag characteristic prevents unnecessary outages during high-torque motor starts.
• Superior Short-Circuit Interrupting: Provides up to 200,000 Amps interrupting capacity at 600 VAC for maximum safety.
• Current Limiting Performance: Restricts electromagnetic and thermal effects of fault currents, extending the life of breakers and contactors.
• Versatile Voltage Rating: Rated for 600V AC and 300V DC, making it suitable for a wide range of industrial control panels and power supplies.
• RK5 Class Compatibility: Easily replaces older or less efficient R-rated fuses in existing HVAC mechanical equipment.

Common Questions

Can I use a Class RK5 fuse to replace a Class H or K5 fuse?
Yes, the Littelfuse FLSR 5 can typically replace Class H or K5 fuses in standard clips. However, RK5 fuses have rejection features that prevent lower-rated fuses from being installed in RK5-specific blocks, ensuring system safety remains intact.

What makes the FLSR series ideal for HVAC compressors?
Compressors exhibit high inrush currents. The time delay properties of this fuse allow for these momentary overloads while still providing fast-acting protection against sustained overcurrent and short-circuit conditions.

Is the FLSR005 suitable for DC control circuits?
Yes, this 5A 600V fuse is specifically rated for up to 300V DC with a 20,000A interrupting rating, making it an excellent choice for specialized DC power applications in industrial environments.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.