Bussmann DFJ Series Class J Hi...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$139.40
Bussmann DFJ Series Class J High-Speed Fuse, Non-Indicating

Bussmann DFJ Series Class J High-Speed Fuse, Non-Indicating

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Model: DFJ-5

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

$139.40
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Bussmann DFJ-20 Class J High-Speed Fuse

The Bussmann DFJ-20 is an Eaton Bussmann series Class J high-speed fuse engineered for demanding overcurrent protection in both AC and DC power systems. Rated 20A, this non-indicating fuse carries a voltage rating of 600 Vac or less and 450 Vdc or less, giving it broad application across AC and DC electrical distribution equipment. The DFJ-20 delivers a high interrupt rating of 200 kAIC at 600 Vac and 100 kAIC at 450 Vdc, allowing it to safely clear fault currents in systems with significant available fault energy. Housed in a durable melamine tube, this Class J high-speed fuse provides fast, dependable response to overcurrent conditions, helping protect conductors, equipment, and personnel in industrial and commercial power distribution systems.

Key Features

  • Amperage Rating: 20A current rating for reliable overcurrent protection in AC and DC circuits.
  • Voltage Rating: Rated 600 Vac or less and 450 Vdc or less, suitable for a wide range of AC and DC power distribution equipment.
  • High Interrupt Rating: 200 kAIC at 600 Vac and 100 kAIC at 450 Vdc for safe operation in high fault-current environments.
  • Class J Design: Class J high-speed fuse form factor for use with compatible Class J fuse blocks, holders, and disconnects.
  • High-Speed Fuse: High-speed fusing characteristic engineered for rapid clearing of fault currents.
  • Non-Indicating: Non-indicating design without a blown-fuse indicator window.
  • Melamine Tube Construction: Durable melamine tube body supports consistent electrical and mechanical performance.
  • Reliable Performance: High-speed response makes the DFJ-20 well suited for protecting power electronics, solid-state equipment, and other loads sensitive to fault-current let-through.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Industrial Power Distribution Systems
  • Motor Control and Drive Circuits
  • Power Electronics and Semiconductor Equipment Protection
  • Panelboards and Switchgear
  • High Fault-Current Industrial Environments
  • Commercial and Industrial Electrical Systems

Why Bussmann?

Bussmann fuses from Eaton are engineered to deliver dependable overcurrent protection backed by high interrupt ratings and rugged melamine tube construction. The DFJ-20 Class J high-speed fuse combines a 20A rating with 200 kAIC and 100 kAIC interrupt performance, helping protect critical electrical equipment from damaging fault currents in both AC and DC power systems. Choose Bussmann for consistent, high-speed fuse performance in demanding professional electrical applications.

Manufacturer Resources

Product Specs

Department:
Electrical
Product Type:
Semiconductor Fuse
Product Group:
Circuit Protection
Product Subgroup:
Fuses
Certifications:
UL Listed
Compliances:
CE Marked
Class:
Class J

Bussmann DFJ-5 – Frequently Asked Questions

1) Will a Bussmann DFJ fuse fit my existing Class J fuse block?
Yes. The Bussmann DFJ series is built to the Class J form factor, so it drops into Class J fuse blocks, holders, and fused disconnects. Class J bodies are dimensionally distinct from Class R, T, or CC, so a DFJ will not fit holders built for those classes.
2) Can I use the Bussmann DFJ on a DC circuit, like a drive bus or battery system?
Yes, it is rated for both AC and DC. The DFJ carries 600 Vac or less and 450 Vdc or less, with 200 kAIC interrupting at 600 Vac and 100 kAIC at 450 Vdc. If your DC bus runs above 450 V, this is not the right fuse.
3) Is a high-speed Class J fuse the right choice for protecting a VFD or solid-state equipment?
That is exactly what the DFJ is for. A high-speed (semiconductor-type) characteristic clears fault current faster than a standard time-delay Class J, which limits let-through energy reaching diodes, IGBTs, and SCRs. For motor-starting loads where you need to ride through inrush, a time-delay Class J is the better pick; the high-speed curve is intended for power electronics and solid-state equipment.
4) Is a 200 kAIC fuse enough for a service with high available fault current?
The DFJ interrupts 200 kA at 600 Vac and 100 kA at 450 Vdc, which covers the available fault current found at most industrial services and switchgear locations. As long as your calculated available fault current at the fuse location is at or below those figures, the fuse is adequately rated and can also be used to current-limit downstream equipment.
5) Can I swap a standard Class J fuse for a Bussmann DFJ in the same holder?
Mechanically yes, since both are Class J and share the holder. Electrically it is a different decision: the DFJ is a high-speed fuse, so its time-current curve clears much quicker than a general-purpose or time-delay Class J. Dropping one into a motor circuit that was coordinated around a time-delay fuse can cause nuisance opening on inrush. Match the fuse type to what the equipment was coordinated for, not just the class and amp rating.
6) What amp ratings does the Bussmann DFJ high-speed fuse come in?
Two ratings are offered: 5A (DFJ-5) and 20A (DFJ-20). Both share the same Class J body and the same 600 Vac / 450 Vdc voltage ratings, so you are only choosing the current rating for your branch or device protection.
7) Does the DFJ fuse have a blown-fuse indicator?
No. The DFJ series is non-indicating, with no indicator window or pin to show it has opened. Crews will need to test continuity or use a panel-mounted indicating means to identify an open fuse, which matters on multi-fuse blocks in switchgear where visual triage saves time.
8) What is the DFJ fuse body made of, and will it hold up in a hot industrial panel?
The body is a melamine tube, a thermoset insulating material used for its mechanical and dielectric stability in power distribution duty. It is the same construction Bussmann uses across its industrial Class J line and is intended for panelboards, switchgear, and motor control enclosures.
How fast can I get the Bussmann DFJ-5 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 DFJ-5 come with a warranty?
Absolutely. The Bussmann DFJ-5 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 DFJ-5?
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
Why buy the Bussmann DFJ-5 from ZenSupply?
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