Bussmann FRN-R-25 Fuse

The Bussmann FRN-R-25 Fuse is a professional-grade Class RK5 dual-element fuse designed specifically for demanding HVACR applications and motor circuits. Rated for 250V AC and 125V DC, this 25A Fusetron time-delay fuse provides superior current-limiting performance, shielding sensitive equipment from short circuits and low-level overloads. The dual-element architecture allows for the high inrush currents typical of compressors and industrial motors without nuisance tripping, maintaining circuit integrity during startup. This industrial cartridge fuse features a ferrule connection and is engineered to simplify selective coordination, preventing unnecessary blackouts by isolating faults to specific downstream branches. Each FRN-R-25 delivers a minimum of 8 seconds of time delay at 500% of the rated current, ensuring that your machinery disconnects and motor control centers remain protected against burnout from single-phasing or prolonged overcurrent events.

• Enhanced Motor Protection: Prevents motor burnout by effectively managing thermal overloads and single-phasing conditions on three-phase systems.
• High Interrupting Rating: Features a robust 200kA RMS symmetrical interrupting rating at 250V AC to stop massive fault currents.
• Efficiency: These Fusetron units are significantly more energy-efficient than standard single-element mechanical fuses, reducing heat buildup within the panel.
• Versatile Application: Ideal for use in fusible safety switches, combination starters, and power panelboards across commercial HVACR environments.
• Rejection Feature: Validates safety by ensuring the correct Class RK5 fuse is used in rejection-style fuse clips, maintaining the circuit's intended protection level.

Can I use a fast-acting fuse instead of an FRN-R-25?
No. In motor or compressor circuits, a fast-acting fuse will likely blow during the initial startup surge. The time-delay characteristic of the FRN-R-25 is required to handle inductive loads.

What is the difference between FRN-R and FRS-R fuses?
The difference is the voltage rating. FRN-R fuses are rated for 250V, whereas FRS-R fuses are rated for 600V. Always verify the system voltage before installation.

Is this fuse a direct replacement for other RK5 brands?
Yes, the Bussmann FRN-R-25 is a standard RK5 dual-element fuse and can typically replace a Littelfuse FLNR-25 or a Mersen TR-25R in existing 250V equipment.

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.