Cooper Bussmann FRN-R-10 Cartridge Time Delay Fuse RK5 10A

Product Description

The COOPER BUSSMANN FRN-R-10 is a Class RK5 cartridge-style time delay fuse rated at 10 amps, designed for general-purpose overcurrent protection in industrial and commercial electrical systems. It measures 2 inches (50.8 mm) in overall length with a 0.563 inch (14.3 mm) diameter and features a dual-element construction that tolerates temporary motor inrush and transformer magnetizing currents without nuisance opening. The non-indicating body keeps the form factor compact for standard fuse holders. Licensed electricians and maintenance technicians install this fuse where NEC-compliant branch-circuit or motor-branch protection is required.

This fuse is suited for motor branch-circuit protection, control-circuit applications, and general-purpose load centers in light commercial and industrial settings. Its time delay characteristic makes it appropriate for loads that draw high inrush current at startup, such as single-phase motors, small transformers, and HVAC control panels. The cartridge body seats in a standard RK5-rated fuse holder and requires no special tooling beyond an appropriate fuse puller for safe removal.

Key Features

• Class RK5 time delay rating handles motor inrush without nuisance trips
• Dual-element construction provides separate overload and short-circuit protection
• Non-indicating cartridge body fits standard RK5 fuse holders
• 20 kA interrupting rating at DC 200 V RMS for robust fault clearing
• CE Certified, CSA C22.2 No. 248.12 Certified, and UL Listed 248-12 Class RK5

Compatibility

Designed as an OEM-style replacement for Class RK5 cartridge time delay fuses used in standard fuse-holder-mounted branch-circuit and motor-circuit protection applications.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the NEC and applicable local codes. Always de-energize and lock out the circuit before removing or installing fuses. Use an insulated fuse puller rated for the voltage and amperage of the circuit; never handle energized fuses with bare hands or unrated tools. Verify the replacement fuse class, amperage, and voltage rating match the circuit requirements and the fuse holder markings before restoring power.