Bussmann FRN-R Series Dual-Ele...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$17.74
Bussmann FRN-R Series Dual-Element Time-Delay Fuse, Class RK5

Bussmann FRN-R Series Dual-Element Time-Delay Fuse, Class RK5

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Model: FRN-R-3

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

$17.74
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Bussmann FRN-R Series Dual-Element Time-Delay Fuse, Class RK5

The Bussmann FRN-R Series Dual-Element Time-Delay Fuse, Class RK5 delivers dependable overcurrent protection for branch circuits, motor loads, and control circuits, and is available in 3A, 4A, and 6A ratings to match your application. This Dual Class RK5 fuse features a non-indicating design with ferrule end x ferrule end terminals for straightforward installation in standard fuse holders and disconnects. Rated 250V and 125Vdc (Standard), it delivers an interrupting rating of 200 kAIC at 250V and 20 kAIC at 125Vdc, with a time-delay opening characteristic of 8 seconds at 500% of rated current to ride through harmless inrush and motor starting surges. Backed by CE Marking, the FRN-R Series is engineered for reliable, code-compliant overcurrent protection in commercial and industrial electrical systems.

Key Features

  • Amp Ratings: Available in 3A, 4A, and 6A to cover a range of branch-circuit and control-circuit protection needs.
  • Dual-Element Time-Delay Design: Class RK5 construction opens in 8 seconds at 500% of rated current, allowing motors and other inductive loads to start without nuisance fuse operation.
  • High Interrupting Capacity: Rated 200 kAIC at 250V and 20 kAIC at 125Vdc for safe interruption of high fault currents.
  • Dual Voltage Rating: Standard rating of 250V and 125Vdc supports both AC and DC circuit applications.
  • Ferrule End Terminals: Ferrule end x ferrule end configuration for compatibility with standard ferrule-type fuse blocks and holders.
  • Non-Indicating Construction: Streamlined, non-indicating body design suited to standard overcurrent protection applications.

Certifications & Compliance

  • CE Marked

Technical Specifications

  • Voltage Rating: 250 Vac, 125 Vdc
  • Compliances: CE Marked
  • Product Type: Time Delay Fuses

Typical Applications

  • Branch Circuit Overcurrent Protection
  • Motor and Motor Control Circuit Protection
  • Control Panel and Panelboard Fuse Protection
  • Commercial and Industrial Electrical Systems
  • Renovation, Retrofit, and New Construction Fuse Replacement

Why Bussmann?

Bussmann by Eaton is a recognized name in circuit protection, and the FRN-R Series Class RK5 dual-element fuse reflects that reputation with a 200 kAIC interrupting rating, dual 250V/125Vdc rating, and CE Marked compliance. Its time-delay characteristic and ferrule end design make it a reliable choice for electrical professionals who need consistent, code-compliant overcurrent protection across 3A, 4A, and 6A ratings.

Manufacturer Resources

Product Specs

Connection:
Ferrule end x ferrule end
Packaging Type:
Standard
Department:
Electrical
Fuse Indicator:
Non-indicating
Class:
Class RK5
Response Time:
8 sec at 500%
Voltage Rating:
250V AC / 125V DC
Number Of Elements:
Dual
Compliances:
CE Marked
Product Type:
Time-Delay Fuse
Series:
FRN-R
Amperage Rating:
3A - 6A
Configuration:
Dual-Element
Listing:
CE Marked
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Bussmann FRN-R-3 – Frequently Asked Questions

1) Will a Bussmann FRN-R fuse fit a 250V fuse block made for Class R fuses?
The FRN-R is a Class RK5 fuse with ferrule end x ferrule end terminals, so it drops into standard ferrule-type fuse blocks, holders, and fusible disconnects sized for 250V Class R ferrule fuses. Class R ferrule bodies carry the rejection groove, so they also seat in rejection-style Class R blocks. In the 3A, 4A, and 6A ratings the body is the ferrule style, not knife blade.
2) Can I use a 250V FRN-R fuse on a 480V circuit?
No. The FRN-R is rated 250V AC and 125V DC, so it must not be applied above 250 volts AC. For a 480V or 600V circuit you need the 600V equivalent, the Bussmann FRS-R Class RK5 dual-element time-delay fuse.
3) Will a 3A or 4A FRN-R hold through motor starting inrush?
That is what the dual-element construction is for. The FRN-R opens in 8 seconds at 500% of its rated current, so a motor drawing several times full-load amps during acceleration rides through without nuisance opening, while the short-circuit element still clears a hard fault fast. A fast-acting fuse at the same amp rating would blow on the same start.
4) Is the FRN-R rated for DC control circuits?
Yes, up to 125V DC, with a 20 kAIC interrupting rating on DC. On AC it is 250V with 200 kAIC. That dual rating makes it usable in DC control and battery circuits as well as standard AC branch circuits.
5) Can an FRN-R replace a one-time Class H or Class K5 fuse in an existing panel?
Electrically the FRN-R is a 250V RK5 dual-element time-delay fuse with a 200 kAIC interrupting rating, well above a typical one-time fuse, and the ferrule body matches standard non-rejection ferrule clips in the same amp size. Going the other way does not work: once a block has Class R rejection hardware, only Class R fuses will seat.
6) What amp ratings does the Bussmann FRN-R come in, and what is the part number?
Three ratings in this group: 3 amp (FRN-R-3), 4 amp (FRN-R-4), and 6 amp (FRN-R-6). All share the same 250V AC / 125V DC rating, RK5 class, and ferrule terminals, so sizing is purely a matter of matching the load and the overcurrent calculation.
7) Does the FRN-R have a blown-fuse indicator?
No. The FRN-R is a non-indicating fuse, so you cannot tell visually whether it has opened. Plan on testing with a meter, or specify an indicating fuse or a blown-fuse indicator at the block if a maintenance crew needs to spot an open fuse at a glance.
8) Is the Bussmann FRN-R CE marked?
Yes, the FRN-R Series carries CE Marking. That is the compliance mark held on record for this dual-element RK5 fuse.
How fast can I get the Bussmann FRN-R-3 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-3 come with a warranty?
Absolutely. The Bussmann FRN-R-3 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-3?
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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