Cooper Bussmann FRN-R-30 Cartridge Time Delay Fuse 30A RK5

Product Description

The COOPER BUSSMANN FRN-R-30 is a cartridge-style, time delay fuse rated at 30 amps in the RK5 fuse class. It is designed for general-purpose overcurrent protection in industrial, commercial, and HVAC electrical systems where inrush currents from motor loads require a time delay before the fuse opens. The cartridge body measures 2 inches in overall length and 0.563 inches in diameter, fitting standard RK5 fuse holders. A dual-element design provides reliable protection by separating the time delay and overload functions into two distinct elements. Licensed electricians and HVAC technicians are the primary installers.

The FRN-R-30 is well-suited for residential and light commercial HVAC disconnect panels, motor control circuits, and general electrical distribution equipment where RK5-class fuse protection is specified. It is rated for a 20 kA interrupting capacity at DC 200 volts RMS, making it appropriate for circuits with significant available fault current. Its non-indicating design means it does not provide a visual trip indication, which should be factored into maintenance and troubleshooting workflows.

Key Features

• 30-amp time delay rating handles motor inrush without nuisance opening
• Dual-element construction separates overload and short-circuit protection
• RK5 fuse class fits standard RK5 fuse holders and disconnect blocks
• 20 kA interrupting capacity at DC 200 volts RMS
• Non-indicating fuse body for straightforward cartridge replacement
• CE Certified, CSA Certified, and UL Listed to applicable fuse standards

Compatibility

Designed for use in RK5-class fuse holders and fused disconnect switches where a 30-amp, time delay cartridge fuse is required per circuit design specifications.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and any applicable local codes. De-energize and lock out the circuit before removing or installing the fuse. Verify the fuse holder is rated for RK5-class cartridge fuses and confirm the circuit voltage and amperage do not exceed the fuse rating before energizing. Never replace a blown fuse without first identifying and correcting the cause of the overcurrent condition.