Cooper Bussmann FRN-R-25ID RK5 Time Delay Fuse 25A

Product Description

The COOPER BUSSMANN FRN-R-25ID is a Class RK5 cartridge-style time delay fuse rated at 25 amps. It is designed for general-purpose overcurrent protection in AC and DC electrical circuits where a time delay characteristic is required to ride through motor inrush currents and other temporary overloads without nuisance opening. The fuse body measures 2 inches in overall length and 0.56 inches in diameter, fitting standard RK5-rated fuse holders. The dual-element construction provides the time delay on overloads while still responding quickly to short-circuit faults. An indicating feature signals when the fuse has opened, aiding troubleshooting. Licensed electricians and industrial maintenance technicians are the primary installers.

The FRN-R-25ID is suited for residential, commercial, and light industrial electrical panels, motor branch circuits, HVAC equipment disconnects, and other applications calling for a Class RK5 time delay fuse. The 25-amp rating makes it a common selection for single-phase motor loads, control circuits, and equipment branch circuits. Its cartridge form factor installs in standard fuse holders and pullout disconnect blocks sized for RK5 class fuses. The indicating function is particularly useful in high-density panel installations where locating a blown fuse quickly reduces downtime.

Key Features

• Class RK5 dual-element time delay design handles motor inrush without nuisance blowing
• 25-amp rating for branch circuit and equipment protection
• Indicating fuse signals open condition for faster fault diagnosis
• Compact cartridge body: 2 inches OAL x 0.56 inches diameter
• 20 kA interrupting rating at DC 200 V RMS for fault protection
• CE Certified, CSA Certified, and UL Listed to applicable standards

Compatibility

Designed for use in fuse holders and pullout disconnects rated for Class RK5 cartridge fuses. Consult the fuse holder manufacturer specifications to confirm amperage and class compatibility before installation.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize and lock out the circuit before removing or installing any fuse. Verify that the replacement fuse amperage, voltage rating, and fuse class match the original equipment specification exactly. Do not substitute a fast-acting fuse for a time delay type in motor circuits, as this will result in nuisance opening on startup.