Cooper Bussmann BP/FRN-R-40ID 40A 250V Class RK5 Fuse 2 Pack

Product Description

The COOPER BUSSMANN BP/FRN-R-40ID is a 40-amp, 250-volt, Class RK5 indicating fuse sold in a 2-pack carded format. It uses a dual-element, time-delay design that provides current-limiting protection while tolerating normal motor inrush and transformer energizing surges. The key distinguishing feature is the visual indicator: the label on the fuse body darkens when the fuse has opened, allowing a technician to identify a blown fuse at a glance without a meter. Licensed electricians and industrial maintenance technicians install this fuse in panel boards, disconnect switches, and fusible equipment where RK5-class protection is required.

This fuse is suited for a broad range of AC power distribution applications in both commercial and light industrial settings. Typical installations include main service panels, feeder circuits, and branch circuits. It is also appropriate for motor branch circuits where time-delay characteristics are necessary to ride through startup current. Additional applications include transformer primary protection and other inductive loads, as well as lighting and heating circuits with non-inductive loads.

Key Features

• Visual open indicator: label darkens when fuse has opened, enabling fast visual inspection
• Dual-element, time-delay construction tolerates normal inrush currents without nuisance opening
• Current-limiting Class RK5 design reduces let-through energy during fault conditions
• Rated 40 amps at 250 volts for use in standard fusible equipment
• UL Listed for compliance with NEC installation requirements
• Sold as a 2-pack on a retail-ready carded blister for convenient jobsite stocking

Compatibility

Designed as a Class RK5 replacement fuse for use in any 250-volt fusible disconnect, panel board, or motor control enclosure rated for RK5-class fuses at 40 amps.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit before removing or installing fuses; confirm voltage absence with a calibrated meter before contact. Use an insulated fuse puller appropriate for the fuse class and enclosure type. Verify that the replacement fuse class, amperage, and voltage rating match the disconnect or panel board nameplate before energizing.