Cooper Bussmann FRN-R-20 Cartridge Fuse 20A 250V

Product Description

The COOPER BUSSMANN FRN-R-20 is a 20-amp, 250-volt Type FRN-R cartridge fuse featuring Fusetron dual-element time-delay technology. It is designed to protect motors, motor branch circuits, and other inductive loads from overloads and short circuits. The time-delay characteristic allows the fuse to ride through normal motor inrush current without nuisance opening, while still providing fast, reliable response to sustained overloads and fault conditions. Licensed electricians and HVAC technicians install this fuse in disconnect switches, control panels, and load centers serving motors and similar equipment.

This fuse is suited for residential and light commercial applications where motor protection is required. Typical uses include air conditioning equipment, refrigeration units, pump motors, and other single-phase inductive loads operating on 250-volt circuits or below. The FRN-R series is a Class RK5 fuse, meaning it fits standard rejection-style fuse holders designed to accept RK5-class fuses. Each unit is sold individually and is supplied boxed; the package quantity in the supplier data reflects a 10-unit pack configuration.

Key Features

• 20-amp continuous current rating with 250-volt AC maximum voltage
• Dual-element, time-delay design tolerates motor inrush without nuisance blowing
• Class RK5 rejection-style cartridge form factor fits standard RK5 fuse holders
• Protects motors, motor branch circuits, and inductive control loads
• Boxed packaging helps protect fuse elements during storage and handling

Compatibility

Designed as an OEM-style replacement or new-installation cartridge fuse for Class RK5 rejection-style fuse holders rated for 250 volts AC and 20 amps.

Installation Notes

Installation must be performed by a qualified electrician in accordance with NFPA 70 (NEC) Article 240 and the equipment manufacturer's disconnect or panel specifications. Always de-energize and lock out the circuit before replacing a fuse. Verify the replacement fuse matches the circuit's required ampere rating and voltage class before insertion. Do not substitute a non-rejection fuse holder for a rejection-style holder, as this defeats the Class RK5 selectivity design.