Cooper Bussmann FNQ-R-20 Cc Time Delay Fuse 20A

Product Description

The COOPER BUSSMANN FNQ-R-20 is a Class CC time delay cartridge fuse rated at 20 amps, designed for general-purpose overcurrent protection in control circuits, motor loads, and transformer primaries. It features a rejection design that prevents accidental substitution of non-Class CC fuses, a critical safety characteristic in properly coordinated protection schemes. The fuse body measures 1.5 inches in length with a diameter of approximately 0.406 inches (10.3 mm). Interrupting ratings reach 20 kA at DC and 200 kA at AC (RMS), making it suitable for circuits with high available fault current. Licensed electricians and HVAC controls technicians are the primary installers.

The FNQ-R-20 fits Class CC fuse holders and is commonly used in residential and light commercial HVAC control panels, motor control centers, and low-voltage transformer circuits. The time delay characteristic allows temporary inrush currents to pass without nuisance tripping, while still providing reliable protection against sustained overloads and short circuits. It is suitable for any application requiring a Class CC rejection-style fuse rated at 20 amps.

Key Features

• Class CC rejection-style body prevents substitution with non-CC fuses
• Time delay construction tolerates motor and transformer inrush without nuisance tripping
• 20 kA DC and 200 kA AC (RMS) interrupting ratings for high-fault-current circuits
• Compact cartridge form: 1.5 inches long, 10.3 mm diameter
• UL Listed 248-4 Class CC, CSA Class CC certified, CE Certified, and RoHS Compliant

Compatibility

Designed for use in Class CC fuse holders. The rejection-style body is physically incompatible with holders intended for non-CC fuse classes, ensuring correct circuit protection coordination.

Installation Notes

Installation should be performed by a qualified electrician in accordance with NEC Article 240 and applicable local codes. De-energize and lock out the circuit before replacing any fuse. Verify the fuse holder is rated for Class CC fuses and that the replacement amperage matches the circuit design. Never substitute a non-time-delay or non-CC fuse in a holder engineered for Class CC rejection fuses.