Cooper Bussmann FNQ-5 Cartridge Time Delay Fuse 5A 500V

Product Description

The COOPER BUSSMANN FNQ-5 is a cartridge-style, time delay fuse rated at 5 amps and 500 volts AC with a 10 kA interrupting rating. The fiber body measures 1.5 inches in length and 10.3 mm in diameter, fitting standard fuse holders used in control circuits, HVAC equipment, and light industrial applications. The time delay characteristic allows brief inrush currents to pass without nuisance tripping, making it well suited for motor-load and transformer-load protection. Licensed electricians and HVAC controls technicians are the primary installers. It carries UL Listed, CSA Certified, CE Certified, and RoHS Compliant markings.

The FNQ-5 is designed for general-purpose overcurrent protection in low-amperage control circuits. Typical applications include HVAC control panels, motor control centers, and light commercial or residential electrical equipment where a time delay element is needed to ride through startup inrush without sacrificing protection against sustained fault conditions. The fuse mounts in a standard fuse holder and is commonly specified in control-circuit wiring conforming to NEC low-voltage panel requirements.

Key Features

• 5 amp rating with 500 volt AC capability and 10 kA interrupting capacity
• Time delay design tolerates inrush current without nuisance tripping
• Fiber cartridge body — 1.5 inches long, 10.3 mm diameter
• Orange color coding for quick amperage identification in the field
• UL Listed 248-14, CSA C22.2 No. 248.14, CE Certified, and RoHS Compliant
• Mounts in standard fuse holders — no special tooling required

Compatibility

Designed as an OEM-style replacement for general-purpose cartridge fuse holders accepting a 10.3 mm diameter, 1.5 inch time delay fuse in residential and light commercial control circuits.

Installation Notes

Installation should be performed by a licensed electrician or qualified HVAC controls technician in accordance with NEC Article 240 and any applicable local codes. De-energize and lock out the circuit before removing or installing fuses — never replace a fuse under load. Verify the fuse holder is rated for the voltage and interrupting capacity of the replacement fuse before installation. Do not substitute a fast-acting fuse where a time delay type is specified, as nuisance tripping or equipment damage may result.