Bussmann Fusetron FRN-R Dual-E...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$42.51
Bussmann Fusetron FRN-R Dual-Element Time-Delay Fuse, 250V

Bussmann Fusetron FRN-R Dual-Element Time-Delay Fuse, 250V

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Model: FRN-R-7-1/2

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

$42.51
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Bussmann Fusetron FRN-R Dual-Element Time-Delay Fuse, 250V

The Bussmann Fusetron FRN-R series is a family of dual-element time-delay fuses rated 250V, available in amperage ratings from 1-1/4 Amp to 7-1/2 Amp to match the specific current-carrying needs of your circuit or equipment. Each fuse in this series pairs a dual-element construction with a spring-loaded thermal unit, allowing it to ride through momentary inrush currents from motors and other equipment while still opening quickly under sustained overload or short-circuit conditions. Every FRN-R fuse is built as a direct-fit replacement for standard fuse holders and fuse blocks rated for this class, simplifying maintenance, retrofit, and upgrade work. With a shared 250V voltage rating across the line, the FRN-R series is suited to branch-circuit and equipment protection applications where reliable time-delay performance is required to prevent nuisance fuse opening.

Key Features

  • Amperage Rating Range: available from 1-1/4 Amp to 7-1/2 Amp, allowing you to select the exact current-carrying capacity your circuit or equipment requires.
  • Voltage Rating: 250V, suitable for systems operating at or below this voltage across every amperage option in the series.
  • Fusetron Dual-Element Design: time-delay construction that rides through temporary overload conditions, such as motor starting inrush, while responding rapidly to true short-circuit or sustained overload faults.
  • FRN-R Series Designation: Bussmann's Fusetron series identifier, with individual amperage ratings selectable to match your specific application.
  • Standard Fuse Construction: designed for compatibility with common fuse holders and fuse blocks accepting this class of fuse, streamlining replacement and installation across the amperage range.
  • Reliable Circuit Protection: engineered to open under fault conditions to help protect connected equipment and wiring from damage caused by overcurrent events, at any amperage rating in the series.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Electrical Circuit Overcurrent Protection
  • Motor and Transformer Circuit Protection
  • Industrial and Commercial Electrical Systems
  • Panelboard and Fuse Block Installations
  • Equipment Replacement and Retrofit Projects
  • General Purpose Branch Circuit Wiring

Why Bussmann?

Bussmann is a well-established name in circuit protection, and the Fusetron FRN-R series is engineered around a dual-element time-delay design that balances reliable overload ride-through with fast-acting response to short circuits. Specifying a Bussmann FRN-R fuse in the 250V, 1-1/4 Amp to 7-1/2 Amp range for your application means installing a fuse built for consistent, dependable performance in demanding commercial and industrial electrical environments, helping maintain code-compliant overcurrent protection across your system. Professionals rely on Bussmann Fusetron fuses like the FRN-R series for consistent time-delay characteristics that reduce nuisance fuse replacements while still safeguarding circuits from damaging fault currents, whatever amperage rating your equipment demands.

Manufacturer Resources

Product Specs

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

Bussmann FRN-R-7-1/2 – Frequently Asked Questions

1) What amp ratings does the Bussmann FRN-R Fusetron fuse come in?
Two ratings are offered in this group of the Fusetron FRN-R line: 1-1/4 amp (FRN-R-1-1/4) and 7-1/2 amp (FRN-R-7-1/2). Both share the same 250V rating, so the choice comes down to matching the amperage to the circuit or nameplate load you are protecting.
2) Can I use a 250V FRN-R fuse on a 480V circuit?
No. The FRN-R Fusetron is a 250V fuse and is only for systems operating at or below 250 volts. For a 480V circuit you need the 600V class RK5 equivalent, which in the Bussmann Fusetron line is the FRS-R series. Never install a 250V fuse where the system voltage is higher.
3) Why use a time-delay fuse instead of a fast-acting one on a motor circuit?
Motors, transformers and similar inductive loads draw a large inrush current for a moment at startup. The FRN-R's dual-element construction with a spring-loaded thermal unit lets it ride through that inrush without opening, while still clearing quickly on a sustained overload or a short circuit. A fast-acting fuse sized to the running current would blow on every start, which is the nuisance opening the Fusetron design exists to avoid.
4) Will an FRN-R fuse fit my existing fuse block or holder?
The FRN-R is built as a direct-fit replacement for standard fuse holders and blocks rated for this class, so if the panel or block currently takes an FRN-R of the same amp and voltage rating it drops straight in. Confirm the block is rated 250V and for the amp range you are installing before swapping.
5) Do I have to replace all three fuses in a disconnect, or just the one that blew?
Standard practice is to replace the full set with fuses of the same series, amp and voltage rating. Mixing a new FRN-R with older, partially aged elements gives uneven opening characteristics on a three-phase load. Since every FRN-R here is 250V, you only need to keep the amperage consistent across the set.
6) Is FRN-R the same thing as a Fusetron fuse?
Fusetron is Bussmann's brand name for its dual-element time-delay line, and FRN-R is the series designation within it for the 250V version. When a drawing or an old fuse body says Fusetron FRN-R followed by a number, that number is the amp rating, as in FRN-R-7-1/2 for 7-1/2 amp.
7) What should a maintenance tech stock FRN-R fuses for?
Typical uses are branch-circuit and equipment overcurrent protection, motor and transformer circuits, panelboard and fuse block installations, and replacement or retrofit work on existing 250V fused equipment. For MRO shelves, keeping the amp ratings that match your installed equipment nameplates is what keeps a line down for minutes instead of days.
How fast can I get the Bussmann FRN-R-7-1/2 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 FRN-R-7-1/2 come with a warranty?
Absolutely. The Bussmann FRN-R-7-1/2 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-7-1/2?
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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