Littelfuse FLSR 25 FLSR025 Fuse

Professional-grade circuit protection is non-negotiable in high-demand environments. The Littelfuse FLSR025 is a Class RK5 time-delay fuse specifically engineered to handle the rigorous inrush currents common in industrial motor circuits and heavy-duty transformers. Rated at 25 Amps and 600V AC (300V DC), this dual-element cartridge fuse offers superior overcurrent protection while virtually eliminating the nuisance tripping that plagues standard single-element fuses during equipment startup.

As a veteran's choice for HVACR and industrial control panels, the FLSR025 provides current-limiting performance to reduce the risk of structural damage from short circuits. Its dual-element design allows for a sustained 500% overload for at least 10 seconds, accommodating the peak startup demands of 3-phase motors without compromising circuit integrity. This industrial-grade cartridge fuse is fully compatible with standard Class R fuse blocks and rejection-style clips, ensuring a safe, specialized fit that prevents accidental replacement with lower-rated fuse classes.

Key Benefits

• High Interrupting Rating: Safely handles faults up to 200,000 Amps RMS Symmetrical for maximum facility safety.
• Dual-Element Construction: Delivers precise time-delay characteristics to protect sensitive motor branch circuits and inductive loads.
• Versatile Application: Ideal for use in service entrance switches, switchboards, and HVAC control transformers.
• Reliable DC Protection: Rated for up to 300V DC, making it suitable for specialized solar and DC industrial drives.

Common Questions

Can I use an FLSR025 to replace a non-time-delay fuse of the same amperage?
Yes, in motor or transformer circuits where startup surges are present, switching to a Class RK5 time-delay fuse like the FLSR025 is often recommended to prevent nuisance blows while maintaining high-level short-circuit protection.

Is this fuse compatible with existing Class R fuse blocks?
Standard FLSR series fuses are designed with a rejection feature that fits Class R fuse holders perfectly, ensuring that only current-limiting fuses can be installed in those critical slots.

How does this compare to a Class CC fuse for motor protection?
While both are for branch circuits, the Littelfuse FLSR025 provides a more robust time-delay curve than most CC fuses, making it the superior choice for high-inrush motors (over 3HP) that require longer starting windows.

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.