Bussmann FRN-R Series RK5 Time...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$50.36
Bussmann FRN-R Series RK5 Time-Delay Fuse, 250V

Bussmann FRN-R Series RK5 Time-Delay Fuse, 250V

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Model: FRN-R-2/10

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

$50.36
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Bussmann FRN-R Series RK5 Time-Delay Fuse, 250V

The Bussmann FRN-R Series is a line of 250V RK5 time-delay fuses engineered to deliver dependable overcurrent protection across motor circuits, control circuits, and general-purpose branch circuit applications. This product page covers the FRN-R Series in amperage ratings from 0.2A to 0.8A, giving electricians and maintenance teams a single source for selecting the correct low-amperage FRN-R fuse for a given circuit. Every fuse in this range shares the same 250V voltage rating and Class RK5, time-delay (TD) construction, allowing the fuse to ride through momentary inrush currents-such as those generated during motor starting or transformer energization-while still opening reliably under sustained overload or short-circuit conditions. This balance of surge tolerance and fast-acting fault protection makes the FRN-R Series a practical choice anywhere dependable, code-compliant circuit protection is required at lower current levels. Electrical professionals specify Bussmann fuses for their consistent, repeatable performance in commercial and industrial power distribution systems.

Key Features

  • Voltage Rating: 250V across the entire FRN-R Series, making these fuses suitable for electrical systems and equipment operating at or below this voltage rating.
  • Amperage Range: Available in ratings from 0.2A to 0.8A, allowing precise selection for low-current motor, control, and instrumentation circuits.
  • Fuse Class: RK5 (Class RK5) construction, a widely used fuse classification designed for time-delay performance in circuits subject to temporary current surges.
  • Time-Delay (TD) Operation: The time-delay design allows FRN-R Series fuses to withstand momentary inrush currents, such as motor starting loads, without nuisance opening, while still providing dependable protection against sustained overloads and short circuits.
  • Model Designation: Identified as part of the Bussmann FRN-R family of RK5 time-delay fuses; select the specific amperage rating required for accurate circuit protection replacement.
  • Consistent Manufacturing: Produced by Bussmann to help ensure uniform, repeatable time-delay characteristics from fuse to fuse across a given installation.
  • Replacement Accuracy: The FRN-R designation helps electricians and maintenance teams specify an exact like-for-like replacement when servicing existing Bussmann FRN-R fuse installations at any amperage within this range.

Technical Specifications

  • Series: RK5
  • Amperage Rating: 8/10A (select amperage option for exact rating, 0.2A - 0.8A range)

Typical Applications

  • Motor Circuit Overcurrent Protection
  • Branch Circuit Protection
  • Control Circuit Protection
  • Industrial and Commercial Electrical Systems
  • Panelboard and Disconnect Switch Fusing
  • Maintenance Replacement for Existing Bussmann FRN-R Fuse Installations

Why Bussmann?

Bussmann is a widely recognized manufacturer of circuit protection products, and the FRN-R Series reflects that engineering focus with its 250V rating and RK5 time-delay construction across the full 0.2A to 0.8A range. Choosing a Bussmann FRN-R Series fuse helps ensure dependable, time-delay overcurrent protection for motor and branch circuit applications where inrush current tolerance and reliable fault clearing are both essential. For facilities and contractors standardizing on Bussmann circuit protection, the FRN-R Series offers a consistent, code-compliant option for maintaining and expanding RK5 time-delay fuse installations at any low-amperage rating.

Manufacturer Resources

Product Specs

Product Type:
Time-Delay Fuse
Voltage Rating:
250V
Series:
RK5
Department:
Electrical
Product Subgroup:
Fuses
list_batch:
BUSS-20260919
Product Group:
Circuit Protection

Bussmann FRN-R-2/10 – Frequently Asked Questions

1) What amp ratings does the Bussmann FRN-R time-delay fuse come in?
In this low-amperage range the FRN-R Series covers 0.2 A (ordered as FRN-R-2/10) and 0.8 A (FRN-R-8/10). Both are 250V Class RK5 time-delay fuses, so the only decision is which rating matches the circuit you are protecting.
2) Can I use a 250V FRN-R fuse on a 480V circuit?
No. The FRN-R is rated 250V, so it belongs on systems and equipment operating at or below 250 volts. For 480V service you need the 600V class RK5 time-delay equivalent, which in Bussmann's line is the FRS-R series, not FRN-R.
3) Will a time-delay fuse hold up to motor starting inrush without blowing?
That is what the time-delay (TD) construction is for. The FRN-R rides through momentary inrush, such as motor starting or transformer energization, and still opens on a sustained overload or short circuit. A fast-acting fuse of the same rating would nuisance-trip on that same inrush.
4) What does Class RK5 mean, and will an FRN-R fit my existing fuse clips?
RK5 is a UL fuse class with standardized dimensions and rejection-style ferrules, so a Class R fuse drops into Class R clips and rejection-type fuseholders of the same amp range and voltage. The FRN-R is RK5, 250V. Class R clips will also accept an RK1 fuse of the same rating if you later want a lower interrupting-rating step up, but a non-rejection H or K fuse body is not an RK5 substitute.
5) I am replacing a blown FRN-R marked 2/10 - is that the same as 0.2 amp?
Yes. Bussmann prints the low ratings as fractions, so FRN-R-2/10 is the 0.2 A fuse and FRN-R-8/10 is the 0.8 A fuse. Match the number on the old fuse body exactly for a like-for-like replacement.
6) Where are sub-1-amp RK5 fuses like these actually used?
At 0.2 A and 0.8 A these are control and instrumentation territory: control transformer primaries, relay and PLC control circuits, metering, and small branch circuits inside panelboards and fused disconnects. They are not motor-running fuses at this size, even though the FRN-R family as a whole is a motor-circuit fuse.
7) We want to standardize our plant's fuse stock - can I use one FRN-R rating for everything?
No, and you should not. The fuse has to be sized to the circuit it protects, so a 0.2 A and a 0.8 A are not interchangeable even though both are 250V RK5 time-delay. What you can standardize on is the family: keeping the whole facility on FRN-R means consistent time-delay characteristics across every holder, with only the amp rating changing panel to panel.
How fast can I get the Bussmann FRN-R-2/10 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 FRN-R-2/10 come with a warranty?
Absolutely. The Bussmann FRN-R-2/10 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-2/10?
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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