Cooper Bussmann FRS-R-9 RK5 Time Delay Fuse 9A

Product Description

The COOPER BUSSMANN FRS-R-9 is a Class RK5 cartridge time delay fuse rated at 9 amps, designed for general-purpose overcurrent protection in industrial and commercial electrical systems. Measuring 5 inches in overall length and 20.6 mm in diameter, this dual-element fuse provides the time-delay characteristics needed to ride through normal motor starting inrush currents without nuisance tripping, while still responding quickly to sustained overloads and short-circuit faults. It mounts in a standard fuse holder and carries CE, CSA, and UL listings. Licensed electricians and electrical contractors install this fuse in motor branch circuits, control panels, and distribution equipment.

The FRS-R-9 is suited for residential, commercial, and light industrial applications where Class RK5 fuse protection is specified. Typical installations include motor starters, HVAC equipment control circuits, and general branch circuit protection where time-delay performance is required to accommodate inrush loads. The dual-element design allows reliable protection without requiring oversized fuse ratings to compensate for startup current.

Key Features

• Class RK5 time delay cartridge fuse rated at 9 amps
• Dual-element construction handles motor inrush without nuisance tripping
• Non-indicating body for standard fuse holder mounting
• CE Certified, CSA C22.2 No. 248.12 Class 1422-02 File 53787 Certified, and UL Listed 248-12 Class RK5 Guide JDDZ File E4273
• Compact form factor: 5 inches overall length, 20.6 mm diameter

Compatibility

Designed as an OEM-style replacement for Class RK5 cartridge fuse positions in standard fuse holders rated for 9-amp, time-delay fuses.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and any applicable local codes. Always de-energize and lockout/tagout the circuit before removing or installing a fuse. Confirm the fuse holder is rated for Class RK5 cartridges and that the replacement fuse amperage matches the circuit protection requirement. Do not substitute a fast-acting fuse where a time-delay fuse is specified for motor circuit protection.