Bussmann FNQ-R Series Class CC...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$118.86
Bussmann FNQ-R Series Class CC Time-Delay Current-Limiting Fuse, 600V

Bussmann FNQ-R Series Class CC Time-Delay Current-Limiting Fuse, 600V

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Model: FNQ-R-4/10

In Stock (leaves warehouse same day if ordered before 3pm ET)

$118.86
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Bussmann FNQ-R-4/10 Limitron Class CC Time-Delay Fuse, 4/10A 600V

The Bussmann FNQ-R-4/10 Limitron is a Class CC time-delay fuse rated 4/10A at 600V, built for current-limiting, high-inrush protection in industrial control circuits, small control transformers, and branch-circuit applications. Its rejection-style, ferrule end x ferrule end body fits standard Class CC fuse holders while blocking lower-performance fuses from being installed in its place. A 200 kAIC interrupt rating and 12-second response time at 200% of rated current deliver dependable short-circuit and overload protection, and the melamine tube, non-indicating construction is built for consistent field performance.

Key Features

  • Electrical Rating: 4/10A at 600V for dependable overcurrent protection in control and branch circuits.
  • Class CC Time-Delay Design: Current-limiting, high-inrush, time-delay construction suited for small control transformers and industrial control applications.
  • Rejection-Style Ferrule Ends: Ferrule end x ferrule end connection with rejection-style body to prevent installation of non-Class-CC fuses.
  • High Interrupt Rating: 200 kAIC interrupt rating for demanding short-circuit conditions.
  • Time-Delay Response: 12-second response time at 200% of rated current for reliable time-delay performance.
  • Melamine Tube Construction: Durable melamine tube fuse body for consistent performance.
  • Non-Indicating Body: Standard non-indicating fuse design.
  • Compact Dimensions: 1.5 IN height, .41 IN length and width, .40625 IN diameter, and .15 LB weight for space-saving installation.

Technical Specifications

  • Amperage Rating: 4/10A
  • Application: Line protection, small control transformers, industrial control, branch circuits
  • Class: Class CC
  • Connection: Ferrule end X ferrule end
  • Fuse Indicator: Non Indicating
  • Interrupt Rating: 200 kAIC
  • Material Type: Melamine tube
  • Packaging Type: Standard
  • Response Time: 12s at 200%
  • Special Features: Rejection style
  • Voltage Rating: 600V
  • Product Type: Current-limiting, high inrush, time delay
  • Product Length: .41 IN
  • Product Details: Current-limiting, high inrush, time delay
  • Product Diameter: .40625 IN
  • Product Height: 1.5 IN
  • Product Weight: .15 LB
  • Product Width: .41 IN

Typical Applications

  • Line Protection
  • Small Control Transformers
  • Industrial Control Circuits
  • Branch Circuit Protection

Why Bussmann?

Bussmann fuses are engineered for consistent, code-compliant circuit protection, and the FNQ-R-4/10 Limitron backs that reputation with a 200 kAIC interrupt rating, rejection-style Class CC construction, and a durable melamine tube body. For electricians and panel builders who need reliable, current-limiting time-delay protection in control and branch-circuit applications, this fuse delivers dependable performance built to spec.

Product Specs

Department:
Electrical
Product Type:
Time-Delay Fuse
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Bussmann FNQ-R-4/10 – Frequently Asked Questions

1) Will the 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 construction, so it drops into standard Class CC holders and blocks. The body measures .40625 inch diameter by 1.5 inch, which is the Class CC size. Note it is rejection-style: the holder will accept it, but a non-rejection Class CC holder will also accept lower-performance fuses, which is exactly what the rejection feature is there to prevent on the holder side.
2) What amp ratings does the Bussmann FNQ-R time-delay fuse come in?
Six ratings: 4/10A, 3/4A, 1-1/2A, 7A, 7-1/2A and 9A, ordered as FNQ-R-4/10, FNQ-R-3/4, FNQ-R-1-1/2, FNQ-R-7, FNQ-R-7-1/2 and FNQ-R-9. All are 600V Class CC time-delay. Amp rating is the only thing you specify.
3) Why do I need a time-delay fuse for a small control transformer instead of a fast-acting one?
A control transformer draws a large magnetizing inrush for a few cycles at energization. A fast-acting fuse sized to the transformer's steady-state current will open on that inrush. The FNQ-R is built as a current-limiting, high-inrush, time-delay fuse, holding 12 seconds at 200% of rated current, so it rides through the inrush while still clearing a genuine overload or short. That is why it is the usual choice for line protection, small control transformers and industrial control circuits.
4) Can I use an FNQ-R on a 480V or 240V control circuit?
Yes. The FNQ-R is rated 600V, and a fuse may be applied at or below its voltage rating, so 480V, 240V and 120V control circuits are all within rating. The 200 kAIC interrupt rating covers the available fault current on the supply side of most industrial panels.
5) Does the FNQ-R have a blown-fuse indicator?
No. The FNQ-R is a non-indicating fuse, so there is no pop-up pin or window to show it has opened. If you want visual indication on a control panel, you need an indicating fuse or a holder with a blown-fuse light. Troubleshooting an FNQ-R means pulling it and checking continuity.
6) Is the FNQ-R current-limiting for arc flash and series rating calculations?
Yes, it is a current-limiting Class CC fuse with a 200 kAIC interrupt rating. That combination is what lets it be applied where available fault current is high, and it is why Class CC fuses are commonly specified for control circuit protection in panels built to a short-circuit current rating.
7) Can I standardize all the control circuits in my facility on the FNQ-R?
Within its range, yes. The FNQ-R family covers 4/10A through 9A at a single 600V rating and a single Class CC footprint, so the holders and blocks stay the same across every circuit and only the amp rating changes in your spares crib. Loads above 9A need a different fuse family, since 9A is the top rating offered in the FNQ-R.
8) What is the fuse body made of, and does it matter in a hot control cabinet?
The FNQ-R uses a melamine tube body. Melamine is the standard thermoset tube material on Class CC fuses because it holds up to the heat and the internal pressure of an interrupting event better than a glass or fiber tube, which is what you want in a packed, warm industrial enclosure.
How fast can I get the Bussmann FNQ-R-4/10 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Bussmann FNQ-R-4/10 come with a warranty?
Absolutely. The Bussmann FNQ-R-4/10 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Bussmann FNQ-R-4/10?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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