Cooper Bussmann FNQ-R-3/4 Time Delay Fuse 0.75A Cc

Product Description

The COOPER BUSSMANN FNQ-R-3/4 is a time delay cartridge fuse in the CC fuse class, rated at 0.75 amps and designed for general-purpose overcurrent protection in low-amperage control circuits. Built to a rejection-style form factor, it physically prevents substitution with non-CC fuses, reducing the risk of improper replacement in the field. The cartridge body measures 38.10 mm in overall length and 10.30 mm in diameter. Licensed electricians and HVAC technicians install this fuse in compatible CC fuse holders to protect transformer secondaries, control panels, and motor branch circuits where a time delay characteristic is required to ride through normal inrush currents without nuisance opening.

This fuse is suited for residential and light commercial control circuit applications where a CC-class, time delay overcurrent device is specified. Typical installations include HVAC control transformer protection, low-voltage circuit boards, and industrial control panels requiring a compact cartridge fuse with inrush tolerance. Its rejection feature ensures it can only be installed in holders designed for the CC fuse class, which is a common requirement in panel assemblies built to NEC and equipment manufacturer specifications.

Key Features

• CC fuse class rejection design prevents substitution with non-CC class fuses
• Time delay characteristic tolerates normal inrush without nuisance tripping
• 0.75 amp rating for low-amperage control circuit protection
• Compact cartridge body: 38.10 mm length, 10.30 mm diameter
• 200 kA interrupting rating at AC RMS for high fault-current applications
• UL Listed 248-4 Class CC, CSA Class CC certified, CE marked, and RoHS compliant

Compatibility

Designed for use in CC-class fuse holders accepting cartridge fuses with a 10.30 mm diameter rejection-style body. Consult the fuse holder manufacturer specifications to confirm physical and electrical compatibility before installation.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC Article 240 and applicable local codes. Always de-energize and lock out the circuit before removing or inserting the fuse. Use an appropriate fuse puller rated for the fuse holder type — never use bare hands or uninsulated tools on energized fuse blocks. Verify that the replacement fuse class, ampere rating, and voltage rating match the original circuit design before restoring power.