Bussmann FRN-R Series Fusetron...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$40.63
Bussmann FRN-R Series Fusetron Time-Delay Fuse, 250V

Bussmann FRN-R Series Fusetron Time-Delay Fuse, 250V

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Model: FRN-R-5-6/10

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

$40.63
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Bussmann FRN-R Series Fusetron Time-Delay Fuse, 250V

The Bussmann FRN-R Series Fusetron Time-Delay Fuse is a 250V overcurrent protection device engineered to deliver dependable, code-compliant circuit protection across a wide range of amperage ratings. This family is available in ratings from 1.8 Amp to 75 Amp, giving electrical contractors and maintenance professionals a single trusted platform for protecting everything from small control circuits and instrumentation to larger branch-circuit and distribution loads. Every fuse in the FRN-R Fusetron line shares the same 250V rating and time-delay construction, so the correct amperage can be selected to match the specific application while relying on consistent, field-proven performance across the entire series.

Key Features

  • Amperage Rating Range: Available from 1.8 Amp through 75 Amp, allowing precise selection for control transformers, instrumentation, low-current branch circuits, and higher-load panelboard and distribution applications.
  • Voltage Rating: Rated 250V, suited to standard low-voltage electrical distribution and branch-circuit applications common in commercial, industrial, and residential systems.
  • Fusetron Series Design: Manufactured as part of the Bussmann Fusetron line, this family is built for the dependable, repeatable performance the Fusetron name is known for in the field.
  • Time-Delay Performance: Every rating in the FRN-R Fusetron family is engineered to tolerate momentary current surges, such as motor-starting inrush current, while still opening promptly under sustained overcurrent conditions to protect connected equipment.
  • FRN-R Model Family: Identified by the FRN-R model designation across all amperage options, allowing electricians and facility teams to cross-reference and order the correct fractional or whole-amp replacement with confidence.
  • Bussmann Manufacturing: Produced by Bussmann, a long-established manufacturer of fuses and overcurrent protection devices used throughout commercial, industrial, and residential electrical systems.

Technical Specifications

  • Series: FRN-R Fusetron
  • Voltage Rating: 250V
  • Amperage Options: 1.8 Amp, 4.5 Amp, 5.6 Amp, 75 Amp (select the rating required for your application)
  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Overcurrent protection for low-current and higher-load electrical branch circuits
  • Control circuit and control transformer primary protection
  • Panelboard and electrical distribution equipment
  • Exact replacement fuse for OEM and aftermarket electrical equipment specifying an FRN-R Fusetron rating
  • Commercial and industrial electrical protection applications

Why Bussmann?

Bussmann has built a strong reputation in the electrical industry for fuses and overcurrent protection products, and the Fusetron series reflects that reputation through its time-delay construction and consistent field performance across every amperage in the FRN-R family. The shared 250V rating paired with the broad 1.8 Amp to 75 Amp range makes this series well suited to applications where an exact, code-compliant fuse match matters. Choosing a genuine Bussmann Fusetron fuse from the FRN-R family helps ensure circuits, control equipment, and connected devices receive the level of overcurrent protection they were designed for, regardless of which amperage rating the application requires.

Manufacturer Resources

Product Specs

Product Type:
Time-Delay Fuse
Voltage Rating:
250V
Series:
FRN-R
Department:
Electrical
Product Subgroup:
Fuses
list_batch:
BUSS-20260919
Product Group:
Circuit Protection

Bussmann FRN-R-5-6/10 – Frequently Asked Questions

1) Can I use a Bussmann FRN-R Fusetron fuse on a 480V circuit?
No. The FRN-R Fusetron is a 250V fuse and must only be applied on circuits at or below 250 volts. For a 600V class RK5 application you need the FRS-R Fusetron instead, which is the 600V member of the same Fusetron family.
2) Does the FRN-R handle motor starting inrush without blowing?
That is what the time-delay construction is for. The FRN-R Fusetron rides through momentary surges such as motor-starting inrush current and still opens on sustained overcurrent, which is why it gets specified on motor branch circuits and control transformer primaries rather than a fast-acting fuse.
3) My panel fuse is marked FRN-R 5-6/10 - is that the same as a 5.6 amp fuse?
Yes, same fuse. Bussmann prints the fractional ratings as mixed numbers, so FRN-R-5-6/10 is the 5.6 amp Fusetron, and FRN-R-1-8/10 is the 1.8 amp. FRN-R-4-1/2 is the 4.5 amp. Order by the printed marking on the fuse body and you will get an exact replacement.
4) Is the FRN-R a direct replacement for an OEM-specified Fusetron in my equipment?
If the nameplate or fuse legend calls for an FRN-R at a given amperage, a genuine Bussmann FRN-R Fusetron of that same rating is the exact replacement. The whole family shares the 250V rating and time-delay characteristic, so the only thing you select is the amp value. Do not substitute a non-time-delay fuse in the same slot; it will nuisance-open on inrush.
5) What amp ratings does the Bussmann FRN-R Fusetron come in?
Four ratings are offered: 1.8 amp (FRN-R-1-8/10), 4.5 amp (FRN-R-4-1/2), 5.6 amp (FRN-R-5-6/10) and 75 amp (FRN-R-75). The fractional ratings suit control transformer primaries and instrumentation; the 75 amp covers larger branch circuit and distribution loads. All four carry the same 250V rating.
6) Will a 75 amp FRN-R fit the same fuse holder as the 5.6 amp version?
No. FRN-R fuses are Class R cartridge fuses and the case size changes with the amp rating, so the fractional and low-amp ratings (1.8, 4.5, 5.6 amp) use a small ferrule body while the 75 amp uses a larger blade-style body with its own clip spacing. Match the amp rating to the holder the equipment was built around rather than swapping across the range.
7) Which FRN-R rating do I use for a control transformer primary?
The low fractional ratings are the ones built for that duty. For small control transformers and instrumentation circuits, the 1.8 amp, 4.5 amp and 5.6 amp FRN-R Fusetron fuses give time-delay protection that tolerates transformer magnetizing inrush. Size to the transformer manufacturer's primary fuse recommendation, not to the load current alone.
How fast can I get the Bussmann FRN-R-5-6/10 delivered?
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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 FRN-R-5-6/10 come with a warranty?
Absolutely. The Bussmann FRN-R-5-6/10 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 FRN-R-5-6/10?
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