Bussmann FRS-R Series Dual-Ele...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$17.61
Bussmann FRS-R Series Dual-Element Class RK5 Fuse, Ferrule End

Bussmann FRS-R Series Dual-Element Class RK5 Fuse, Ferrule End

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Model: FRS-R-4

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

$17.61
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Bussmann FRS-R Series Dual-Element Class RK5 Fuse, Ferrule End

The Bussmann FRS-R Series from Eaton is a dual-element, time-delay fuse built to Class RK5 specifications for reliable overcurrent protection in commercial and industrial circuits. Available in 4A and 7A ratings, this ferrule end x ferrule end, non-indicating fuse is rated 600 VAC and 300 VDC, with an interrupt rating of 200 kAIC at 600 VAC and 20 kAIC at 300 VDC. Its dual-element construction delivers a 10-second opening time at 500% of rated current, allowing momentary overloads to pass while still protecting against sustained faults.

Key Features

  • Amp Rating Range: Available in 4A and 7A ratings to match a range of circuit protection requirements.
  • Dual-Element Class RK5 Design: Time-delay construction provides both overload and short-circuit protection for motor and general circuits.
  • Ferrule End x Ferrule End: Standard ferrule terminations for compatibility with common fuse blocks and holders.
  • Non-Indicating Operation: Standard, non-indicating fuse body for straightforward installation.
  • Dual Voltage Rating: Rated 600 VAC and 300 VDC for use across AC and DC circuit applications.
  • High Interrupt Rating: 200 kAIC at 600 VAC and 20 kAIC at 300 VDC for demanding, high fault-current environments.
  • Time-Delay Characteristic: Opens in 10 seconds at 500% of rated current, resisting nuisance opening from temporary inrush or overload.
  • Standard Series: Part of the Eaton Bussmann FRS-R standard dual-element fuse series.

Certifications & Compliance

  • CE Marked

Technical Specifications

  • Compliances: CE Marked
  • Voltage Rating: 600 Vac, 300 Vdc
  • Interrupt Rating: 200 kAIC at 600 Vac

Typical Applications

  • Motor Circuit Overload and Short-Circuit Protection
  • Branch Circuit and Feeder Protection
  • Industrial Control Panels and Machinery
  • DC Circuit Protection in Solar and Battery Systems
  • Panelboard and Fuse Block Installations

Why Bussmann?

Bussmann fuses from Eaton are engineered to Class RK5 standards and CE marked for verified performance, giving electrical professionals a dependable, code-compliant option for circuit protection. The FRS-R Series' dual-element, time-delay design and dual 600 VAC/300 VDC rating make it a versatile choice for both AC and DC applications where reliable, high-interrupt-rating protection is required.

Manufacturer Resources

Product Specs

Compliances:
CE Marked
Connection:
Ferrule end x ferrule end
Packaging Type:
Standard
Department:
Electrical
Fuse Indicator:
Non-indicating
Class:
Class RK5
Response Time:
10 sec at 500%
Voltage Rating:
600 VAC / 300 VDC
Number Of Elements:
Dual
Interrupt Rating:
200 kAIC at 600 Vac
Product Type:
Time-Delay Fuse
Series:
FRS-R
Amperage Rating:
4A - 7A
Standards:
Class RK5
Listing:
CE Marked
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Bussmann FRS-R-4 – Frequently Asked Questions

1) What amp ratings can I get in the Bussmann FRS-R Class RK5 fuse?
The FRS-R dual-element fuse line covers 4A (FRS-R-4), 6A, 7A, 8A, 9A, 10A, 15A, 20A, 25A, 35A, 40A, 45A and 50A. Order by amp rating, matched to the circuit or motor overload calculation, since the body style and voltage rating are the same across them.
2) Will a Bussmann FRS-R fuse hold up to motor inrush without blowing?
That is what the dual-element build is for. The FRS-R opens in 10 seconds at 500 percent of rated current, so starting inrush and short momentary overloads ride through while a sustained overload or fault still clears. It is the usual choice for motor branch circuits, control panels and machinery feeders.
3) Can I use the FRS-R fuse on a DC circuit, like a battery or solar disconnect?
Yes. The FRS-R carries a dual rating of 600 VAC and 300 VDC, with 200 kAIC interrupting at 600 VAC and 20 kAIC at 300 VDC. Keep the DC circuit at or below 300 V and inside that 20 kAIC available fault current.
4) Will a ferrule-end FRS-R fuse fit my existing fuse block?
The FRS-R in these ratings is ferrule end by ferrule end, so it drops into standard Class R clip-style fuse blocks and holders sized for the same amp range. If your block has bolt-down slots for a blade or knife-blade fuse instead of spring clips, a ferrule fuse will not seat in it, and you need the bolted/blade style body.
5) What does Class RK5 mean for my fuse block, and can I put one in a Class R rejection holder?
Class RK5 is a Class R form factor, so an FRS-R has the annular rejection groove and will install in a Class R rejection-type block or switch. The reverse is not true: a plain Class H or K fuse without the groove will not fit a rejection holder. RK5 is the lower let-through class of the two R ratings, so where a drawing calls specifically for RK1, use an RK1 fuse instead.
6) Is the FRS-R fuse suitable for a 200 kA available fault current service?
Yes on the AC side. The interrupting rating is 200 kAIC at 600 VAC, which covers high fault-current industrial services and switchboards. On DC the figure drops to 20 kAIC at 300 VDC, so size DC applications against that number.
7) I'm standardizing fuse stock across a facility. Can I stock one FRS-R body style for both AC and DC panels?
Yes, within limits. One ferrule-end FRS-R series covers both, since every rating carries the same 600 VAC / 300 VDC dual rating and the same 10-second-at-500-percent time delay. You still stock by amp rating, from 4A up to 50A, and you still need a separate part for any holder that takes blade-style fuses rather than clips.
8) Does the FRS-R fuse show when it has blown?
No. It is a non-indicating body, so there is no pop-up or window to tell you which one opened. Troubleshoot with a meter or continuity check across each holder, or specify an indicating fuse series if you want visual confirmation in a panel.
9) What compliance marking does the Bussmann FRS-R fuse carry?
The FRS-R is CE marked and built to Class RK5. For facility documentation, those are the two designations to record against the part number.
How fast can I get the Bussmann FRS-R-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 FRS-R-4 come with a warranty?
Absolutely. The Bussmann FRS-R-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 FRS-R-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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