Cooper Bussmann FNQ-9 Cartridge Time Delay Fuse 9A 500V

Product Description

The COOPER BUSSMANN FNQ-9 is a cartridge-style, time-delay fuse rated at 9 amps and 500 volts AC with a 10 kA interrupting rating. The fiber body measures 1.5 inches in overall length and 10.3 mm (approximately 0.406 inches) in diameter. Time-delay construction allows brief inrush currents to pass without nuisance opening, making this fuse well suited for motor-load and control-circuit protection. It mounts in a standard fuse holder and is installed by licensed electricians and HVAC technicians working on low-voltage and line-voltage control panels, motor branch circuits, and supplemental circuit protection applications.

The FNQ-9 is commonly applied in control panels, transformer secondary circuits, and motor starter protection where a time-delay characteristic is required to ride through startup inrush. Its compact cartridge form fits standard midget fuse holders found in residential and light commercial electrical enclosures and HVAC equipment control sections. The orange color-coded body aids quick visual identification of the amperage rating during service and inspection.

Key Features

• Time-delay fuse element handles brief inrush currents without nuisance tripping
• 9 amp rating with 500 volt AC capacity and 10 kA interrupting rating
• Fiber cartridge body, 1.5 inches long and 10.3 mm in diameter
• Mounts in standard midget fuse holders — no special tooling required
• Orange color-coded body for fast amperage identification in the field
• CE Certified, CSA Certified, UL Listed, and RoHS Compliant

Compatibility

Designed for use in standard midget cartridge fuse holders accepting a 10.3 mm diameter, 1.5-inch cartridge fuse. Suitable for general-purpose control circuit and motor branch circuit protection in residential and light commercial applications.

Installation Notes

Installation should be performed by a qualified electrician or licensed HVAC technician in accordance with the National Electrical Code (NEC). De-energize and lock out the circuit before removing or replacing any fuse. Verify that the replacement fuse amperage and voltage ratings match the circuit requirements before reinstalling. Do not install a higher-amperage fuse than the circuit is designed to carry.