Bussmann FRN-R-10 Fuse

The Bussmann FRN-R-10 is a heavy-duty, 10 Amp Class RK5 dual-element time-delay fuse engineered for superior circuit protection in inductive loads. Rated for 250V AC and 125V DC, this Fusetron series fuse features a minimum 10-second time-delay at 500% of the rated current, effectively preventing nuisance tripping caused by high motor inrush currents or temporary surges. For HVACR contractors, this component is essential for protecting small motor circuits, control transformers, and solenoid valves where standard fast-acting fuses fail. The rejection-style design ensures compliance with safety standards by preventing the installation of lower-rated fuses into RK5-specific fuse blocks. With a 200kA symmetrical interrupting rating, the FRN-R-10 provides high-level current limitation, reducing the risk of thermal and magnetic damage to downstream components during a short-circuit event.

Key Technical Benefits

• Dual-element construction provides accurate overcurrent protection while allowing for high-starting torque.
• 200,000 Amp Interrupting Rating (AIR) ensures high-level safety in industrial and commercial electrical panels.
• Class RK5 rejection feature prevents accidental replacement with inferior Class H or K fuses.
• Current-limiting performance minimizes peak let-through current to protect sensitive motor starters and contractors.
• Versatile 250V rating makes it a standard inventory item for residential and light commercial HVAC units.

Common Technical Questions

Can I use an FRN-R-10 to replace a standard non-time-delay fuse?
Yes, in most motor applications, switching to a time-delay RK5 fuse is preferable to prevent unnecessary downtime from temporary surges, provided the voltage and amperage ratings match.

What is the difference between FRN-R and FRS-R fuses?
The FRN-R series is rated for 250V AC, whereas the FRS-R series is rated for 600V AC. Always verify the system voltage before selecting a replacement.

Will this fuse fit into a standard 10 amp fuse holder?
The FRN-R-10 features the Class RK5 rejection slot. It will fit into any standard R-Series fuse block or disconnect, but it will block the installation of non-rejection style fuses in those same holders for safety.

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.