Bussmann FNQ-1/4 Fusetron Time...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$84.33
Bussmann FNQ-1/4 Fusetron Time-Delay Midget Fuse, 500V

Bussmann FNQ-1/4 Fusetron Time-Delay Midget Fuse, 500V

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Model: FNQ-1/4

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

$84.33
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Bussmann FNQ-1/4 Fusetron Time-Delay Midget Fuse, 500V

The Bussmann FNQ-1/4 is a Fusetron time-delay midget fuse rated for 500V, engineered for dependable overcurrent protection in electrical circuits and equipment. As part of the Bussmann FNQ Fusetron series, this midget fuse uses a time-delay fuse design intended to ride through brief current surges while still opening reliably under sustained overload conditions. Its compact midget fuse form factor allows it to be used in space-constrained fuse blocks, holders, and control panels where standard-size fuses will not fit. The FNQ-1/4 is identified by its Bussmann model number and 500V voltage rating, making it easy to specify as a like-for-like replacement in existing fuse installations. Fuses like the FNQ-1/4 are commonly specified by electricians and panel builders who need a direct, code-compliant replacement for existing midget-style fuse holders.

Key Features

  • Model FNQ-1/4: Genuine Bussmann FNQ series midget fuse identified by the model number FNQ-1/4, simplifying cross-reference and replacement.
  • Voltage Rating: Rated for 500V, supporting use in higher-voltage circuit protection applications.
  • Fusetron Time-Delay Design: Manufactured as a Bussmann Fusetron fuse, providing time-delay protection characteristics that help the fuse tolerate momentary current surges without nuisance opening, while still responding to sustained overloads.
  • Compact Midget Fuse Format: Midget fuse sizing allows installation in compact fuse blocks, holders, and panelboards where standard-size fuses will not fit.
  • Bussmann Build Quality: Manufactured by Bussmann, a long-established name in circuit protection components for electrical systems.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • General Purpose Electrical Circuit Protection
  • Control Circuit and Panel Protection
  • Industrial and Commercial Electrical Systems
  • Panelboard and Fuse Holder Installations

Why Bussmann?

Bussmann is a widely recognized manufacturer of circuit protection products, and the FNQ Fusetron series is built to deliver dependable time-delay fuse performance in 500V-rated electrical systems. Specifying genuine Bussmann midget fuses like the FNQ-1/4 helps ensure consistent, reliable overcurrent protection for professional and industrial electrical installations that depend on accurate, code-compliant circuit protection components. Bussmann fuses undergo rigorous manufacturing standards to help ensure consistent performance across circuit protection applications.

Manufacturer Resources

Product Specs

list_batch:
BUSS-20260919
Product Type:
Time-Delay Fuse
Voltage Rating:
500V
Series:
FNQ
Department:
Electrical
Product Subgroup:
Fuses
Product Group:
Circuit Protection

Bussmann FNQ-1/4 – Frequently Asked Questions

1) What amp rating is the Bussmann FNQ-1/4 midget fuse?
The FNQ-1/4 is a 1/4 amp fuse, rated 500 volts. The fraction in the model number is the ampere rating, not a dimension, so FNQ-1/4 protects at a quarter amp. That low a rating is typical for control transformer primaries and instrument circuits, and you want to confirm the amp rating against what's printed on the fuse you're pulling out before you swap it.
2) Will a 500V fuse work in a 240V or 120V control circuit?
Yes. A fuse's voltage rating is a maximum, not a requirement, so the 500V-rated FNQ-1/4 can be used in any circuit at or below 500 volts. What you cannot do is go the other way and put a 250V fuse in a 480V circuit. That is why the FNQ is commonly specified on 480V and 600V-system control transformer primaries where a 250V midget fuse would be unsafe.
3) Is the Bussmann FNQ a time-delay or fast-acting fuse?
Time-delay. The FNQ Fusetron series is built to ride through brief inrush surges, such as a transformer magnetizing current or a solenoid pull-in, without opening, while still clearing a sustained overload. If your circuit nuisance-trips on energizing, a fast-acting midget fuse is the wrong choice and a time-delay FNQ is what you want. Conversely, for semiconductor or instrument protection where you need the fastest possible clearing, time-delay is not what you want.
4) Will the FNQ-1/4 fit a standard midget fuse holder?
It is a midget-format fuse, so it goes into midget fuse blocks, in-line holders, and panel-mount holders built for that class. Midget fuses are the 13/32 inch diameter by 1-1/2 inch long body size, which is what lets them fit compact control panels where a standard ferrule or class fuse will not. If your existing holder takes a 13/32 x 1-1/2 fuse, the FNQ drops in.
5) Can I use the FNQ-1/4 as a direct replacement for the fuse already in my panel?
If the fuse you are removing is marked FNQ-1/4, yes, this is the like-for-like part. The model number is the whole cross-reference: match FNQ series, match the 1/4 amp, and confirm the holder is 500V-rated or better. Do not substitute by body size alone, because a different midget series with the same dimensions may be fast-acting or carry a lower voltage rating.
6) What is the difference between Bussmann FNQ and FNQ-R fuses?
Both are time-delay midget fuses, but FNQ-R is the 600V current-limiting Class CC version with the rejection feature that only seats in a CC-rejection holder. The plain FNQ is rated 500V and is not a rejection-style fuse, so it fits general midget holders. If your panel drawing calls for Class CC with rejection, the plain FNQ-1/4 will not satisfy it; if you are replacing a standard midget fuse in an existing holder, FNQ is the match.
7) Where are FNQ midget fuses typically used on a commercial job?
Control circuits and control transformer protection, panelboard and fuse holder installations, and general industrial or commercial branch circuit protection. Panel builders reach for the FNQ when there is no room for a full-size fuse and the circuit sees inrush on every energizing cycle. At 1/4 amp it is a small-load device, not a motor or feeder fuse.
How fast can I get the Bussmann FNQ-1/4 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-1/4 come with a warranty?
Absolutely. The Bussmann FNQ-1/4 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-1/4?
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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