Cooper Bussmann FRS-R-12 RK5 Cartridge Time Delay Fuse 12A

Product Description

The COOPER BUSSMANN FRS-R-12 is a Class RK5 cartridge time delay fuse rated at 12 amps, designed for general-purpose overcurrent protection in industrial and commercial electrical systems. With a dual-element construction and a 20 kA interrupting rating at DC 200 volts RMS, this fuse provides reliable protection against sustained overloads and short-circuit conditions. It measures 5 inches in overall length and 20.6 millimeters in diameter, fitting standard RK5 fuse holders. Licensed electricians and electrical maintenance technicians are the primary installers of this component.

The FRS-R-12 is suited for general-purpose branch circuit and equipment protection in residential, commercial, and light industrial applications. Its time delay characteristic makes it appropriate for motor branch circuits and other inductive loads that produce normal startup inrush current. The fuse mounts in a standard fuse holder and is a common choice for panel boards, disconnect switches, and load centers where Class RK5 fusing is specified.

Key Features

• Class RK5 dual-element time delay design handles inrush current without nuisance opening
• 12 amp rating with 20 kA interrupting capacity at DC 200 volts RMS
• Non-indicating cartridge body in standard 5-inch length and 20.6 millimeter diameter
• Mounts in standard RK5 fuse holders — no special tooling required
• 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

Compatibility

Designed as an OEM-style replacement for Class RK5 fuse positions in standard cartridge fuse holders requiring a 12 amp time delay fuse at the 5-inch form factor.

Installation Notes

Installation should be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and lock out the circuit before removing or installing a fuse. Verify the fuse holder is rated for Class RK5 cartridge fuses before insertion. Do not substitute a fuse of a different class, amperage, or time delay characteristic for this position.