Bussmann FNQ-R Series Class CC Time-Delay Current-Limiting Fuse, 600VAC/300VDC
The Bussmann FNQ-R Series is a Class CC current-limiting, time-delay fuse line built for industrial control and branch circuit protection, available in amp ratings from 1A to 30A to match a wide range of circuit requirements. Every fuse in the series carries a 600VAC/300VDC dual voltage rating, a 200 kAIC interrupt rating at 600VAC, and a 12-second time delay at 200% rating that allows temporary overloads and motor starting inrush without nuisance tripping. The rejection-style Class CC design and ferrule end connections make this series a dependable choice for electrical contractors and industrial facilities seeking code-compliant overcurrent protection.
Key Features
- Amp Rating Range: Available in ratings from 1A to 30A, letting installers match fuse protection precisely to circuit and conductor ampacity requirements.
- Current Limiting Protection: 200 kAIC interrupt rating at 600VAC reduces let-through energy and minimizes arc flash hazards during fault conditions.
- Class CC Rejection Design: Rejection-style construction prevents installation of incorrect fuse types, ensuring only properly rated fuses are used.
- Dual Voltage Rating: 600VAC/300VDC rating provides versatility across AC and DC industrial control applications.
- Time Delay Characteristics: 12-second time delay at 200% rating accommodates motor starting inrush and temporary overloads while protecting against sustained overcurrent.
- Ferrule End Connections: Ferrule end x ferrule end terminals seat securely in compatible Class CC fuse holders.
- Melamine Tube Construction: High-temperature resistant melamine housing supports reliable operation under demanding conditions.
Certifications & Compliance
- CE Marked
Technical Specifications
- Product Width: .41 in
- Special Features: Rejection style
- Response Time: 12 sec at 200%
- Connection: Ferrule end x ferrule end
- Product Type: Current-limiting high inrush time-delay fuse
Typical Applications
- Industrial Control Circuits, Motor Starters, and Contactors
- Branch Circuit Protection for Lighting and Receptacle Circuits
- Small Control Transformer Primary and Secondary Protection
- Fractional Horsepower Motor Protection Circuits
- Industrial Machinery Control Panels and Automation Systems
- Commercial Building HVAC and Lighting Control Systems
Why Bussmann?
Bussmann engineers the FNQ-R Series with current-limiting technology and Class CC rejection design to reduce let-through energy and prevent fuse misapplication across the 1A-30A range. With a 200 kAIC interrupt rating, 600VAC/300VDC dual rating, melamine tube construction, and CE marked compliance, this series delivers the reliable, code-compliant overcurrent protection electrical professionals depend on for industrial control and branch circuit applications.
Manufacturer Resources
Product Specs
- Class:
- Class CC
- Product Width:
- .41 in
- Special Features:
- Rejection style
- Packaging Type:
- Standard
- Product Material:
- Melamine
- Fuse Indicator:
- Non-indicating
- Product Weight:
- .15 lb
- Response Time:
- 12 sec at 200%
- Connection:
- Ferrule end x ferrule end
- Department:
- Electrical
- Product Type:
- Time-Delay Fuse
- Connection Type:
- Ferrule End
- Voltage Rating:
- 600VAC/300VDC
- Amperage Rating:
- 1A-30A
- Configuration:
- Rejection Style
- Standards:
- CE Marked
- Product Group:
- Fuses
- Product Subgroup:
- Time Delay Fuses
Bussmann FNQ-R-10 – Frequently Asked Questions
1) Will a Bussmann FNQ-R fuse fit a standard Class CC fuse holder?
Yes. The FNQ-R is a Class CC fuse with ferrule end x ferrule end terminals, so it seats in any holder or fuse block built for Class CC. It also uses the rejection-style Class CC body, which means it will not drop into a non-rejection holder sized for ordinary midget fuses, and a non-CC midget fuse cannot be substituted into a CC rejection holder. That rejection feature is the point: it keeps someone from replacing a 600V current-limiting fuse with something that is not rated for the circuit.
2) Will the FNQ-R hold on motor starting inrush without nuisance blowing?
That is what the time delay is for. The FNQ-R carries a 12 second delay at 200% of rating, so a temporary overload or a motor start surge rides through instead of opening the fuse. It is used on fractional horsepower motor circuits, motor starters and contactors, and control transformer primaries where inrush is normal. For a sustained overcurrent it still clears. If your load draws no inrush at all, a fast-acting Class CC would be the tighter choice.
3) What amp ratings does the Bussmann FNQ-R come in?
The series runs 1A through 30A. Stocked ratings are 1, 2, 3, 5, 6, 8, 10, 15, 20 and 30 amps, ordered as FNQ-R-1 through FNQ-R-30 with the amp value as the suffix. Size the fuse to the conductor ampacity and the control device you are protecting, not to the holder.
4) Does the FNQ-R have a blown fuse indicator?
No. The FNQ-R is non-indicating, so there is no pop-up pin or window to show it has opened. On a panel where techs need to spot a blown fuse by eye, plan on an indicating fuse holder or a blown-fuse indicating block instead of relying on the fuse body.
5) Is the FNQ-R current limiting, and does that help with arc flash?
It is a current-limiting fuse. Under a fault it clears within the first quarter cycle range of let-through rather than waiting for the full available fault current, which reduces let-through energy and the incident energy at the equipment. With 200 kAIC at 600VAC it is applied where available fault current is high. Facilities standardizing panels for arc flash study results commonly use Class CC for exactly this reason.
6) What is the difference between the FNQ-R and a plain FNQ fuse?
The R in FNQ-R is the Class CC rejection feature. An FNQ-R has the rejection-style ferrule geometry and the Class CC 600VAC/300VDC rating with 200 kAIC interrupting, so it belongs in a Class CC rejection holder. A non-rejection midget fuse of the same physical length will not seat in that holder, and putting one in a non-rejection block gives up the misapplication protection you paid for. If your existing block is Class CC rejection, FNQ-R is the fuse it was built for.
7) What is the FNQ-R fuse body made of and will it hold up in a hot control panel?
The tube is melamine, a high temperature resistant material, which is what lets it run in enclosed control panels and machinery cabinets where ambient temperatures climb. Note that fuse current ratings in general derate as ambient temperature rises, so size accordingly on a hot enclosure.
8) Is the Bussmann FNQ-R CE marked for machinery being exported?
Yes, the FNQ-R carries CE marking, which matters on control panels and machinery destined for European markets.
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Does the Bussmann FNQ-R-10 come with a warranty?
Absolutely. The Bussmann FNQ-R-10 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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