Cooper Bussmann FNQ-25 Cartridge Time Delay Fuse 25A 500V

Product Description

The COOPER BUSSMANN FNQ-25 is a cartridge-style, time-delay fuse rated at 25 amps and 500 volts AC with a 10 kA interrupting capacity. It measures 1.5 inches in overall length and 10.3 mm (approximately 0.406 inches) in diameter, with a fiber body construction and an orange color designation for quick visual identification. The time-delay characteristic allows it to tolerate brief inrush current surges without nuisance tripping, making it well suited for motor branch circuits and control panel applications. Licensed electricians and HVAC controls technicians are the primary installers of this fuse type.

This fuse is designed for general-purpose overcurrent protection in commercial and residential electrical systems where a time-delay cartridge fuse is specified. Common applications include motor control circuits, HVAC control panels, and other branch circuits subject to temporary inrush conditions. It mounts in a standard fuse holder sized for this cartridge format. The compact dimensions make it a practical fit in tight panel and control-box installations where space is limited.

Key Features

• 25-amp rating with 500-volt AC capacity and 10 kA interrupting rating
• Time-delay design tolerates motor inrush and transformer energizing surges without nuisance opens
• Fiber body cartridge construction with orange color coding for fast visual ID
• CE Certified, CSA C22.2 No.248.14 Certified, UL Listed 248-14, and RoHS Compliant
• Mounts in a standard cartridge fuse holder — no tools required for replacement

Compatibility

Designed as an OEM-style replacement for standard cartridge fuse holders accepting a 10.3 mm diameter, 1.5-inch time-delay fuse in general-purpose overcurrent protection applications.

Installation Notes

Installation and replacement should be performed by a qualified electrician or licensed HVAC technician in accordance with the National Electrical Code (NEC). Always de-energize and lock out the circuit before removing or installing a fuse. Use an approved fuse puller when extracting cartridge fuses from live-rated holders to prevent arc flash exposure. Verify that the replacement fuse amperage and voltage rating match the circuit requirements before restoring power.