Cooper Bussmann FRN-R-15 Time Delay Cartridge Fuse 15A 250V

Product Description

The COOPER BUSSMANN FRN-R-15 is a 15-amp, 250-volt Class RK5 time-delay cartridge fuse designed for motor circuit protection and general branch circuit overcurrent protection. Built on the Fusetron dual-element, time-delay platform, this fuse tolerates harmless motor inrush currents without nuisance opening while still responding quickly to sustained overloads and short-circuit faults. Licensed electricians and HVAC technicians install this fuse in disconnect switches, motor starters, and loadcenters wherever RK5-type fusible protection is specified. Each unit ships in a boxed package of 10.

The FRN-R-15 is a standard trade-stock fuse used in residential and light commercial HVAC disconnect boxes, condenser unit disconnects, and motor control panels. Its dual-element construction makes it suitable for circuits driving single-phase compressors, fan motors, pump motors, and other inductive loads that produce high starting currents. It is particularly common in applications where a standard fast-acting fuse would open on motor startup, causing unnecessary service calls.

Key Features

• 15-amp continuous current rating for motor and branch circuit protection
• 250-volt AC rating suitable for residential and light commercial service
• Dual-element, time-delay design tolerates motor inrush without nuisance tripping
• Class RK5 rejection-style ferrule body prevents substitution of lower-rated fuse classes
• Fusetron time-delay platform provides reliable overload and short-circuit response
• Sold in a boxed pack of 10 for service van and shop stocking

Compatibility

Designed as an OEM-style replacement cartridge fuse for 250-volt Class RK5 fusible disconnect switches and motor circuit protection applications commonly found in residential and light commercial HVAC and electrical systems.

Installation Notes

Installation must be performed by a licensed electrician or qualified HVAC technician in accordance with NEC Article 240 and local codes. Always open and lock out the disconnect switch and verify the circuit is de-energized before removing or inserting fuses. Use a fuse puller rated for the cartridge size — never pull an energized cartridge fuse by hand. Confirm the replacement fuse amperage, voltage, and class match the disconnect nameplate before closing the cover.