Bussmann R Series Fuse Clip Re...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$33.88
Bussmann R Series Fuse Clip Reducer

Bussmann R Series Fuse Clip Reducer

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Model: NO.663-R

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

$33.88
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Bussmann R Series Fuse Clip Reducer

The Bussmann R Series Fuse Clip Reducer family is a line of compact adapter components designed to modify fuse clip spacing inside a switch, panelboard, or disconnect so that a smaller fuse can be securely mounted in a larger fuse holder. This model line spans 10 catalog numbers — NO.213, NO.213-R, NO.226, NO.242-R, NO.2621-R, NO.263-R, NO.2662-R, NO.2664, NO.663, and NO.663-R — giving electrical contractors and maintenance teams a fast, code-conscious way to reduce fuse ampacity without replacing the entire fuse holder, switch, or panel hardware. Depending on the model selected, reducers in this family carry amperage step-down ratings such as 100/200-Amp and voltage ratings such as 250/600 Volt, so the correct catalog number can be matched to the exact clip opening and fuse size on the job. Because each reducer works directly with existing fuse clip geometry, the R Series helps simplify retrofit projects, emergency fuse changes, and planned ampacity downsizing on 250/600 Volt rated distribution systems.

Key Features

  • Model Range: 10 catalog numbers in the R Series — NO.213, NO.213-R, NO.226, NO.242-R, NO.2621-R, NO.263-R, NO.2662-R, NO.2664, NO.663, and NO.663-R — cover a range of fuse clip step-down needs.
  • Amperage Step-Down: Select models, including the NO.2621-R, are rated 100/200-Amp, sized to fit inside a 200-Amp fuse clip opening and adapt it to securely hold a 100-Amp fuse.
  • Voltage Rating: Reducers in this family are rated up to 250/600 Volt, suited for common low-voltage industrial and commercial distribution voltage classes found in disconnects, panelboards, and switchboards.
  • "R" Series Fuse Reducer: This model line is built specifically to adapt oversized fuse clip openings to smaller fuse dimensions across multiple ampacity combinations.
  • Field-Installable Design: Each reducer seats directly into the existing fuse clip, meaning it can be installed in the field without swapping out the fuse holder, disconnect switch, or panelboard hardware.
  • Space- and Cost-Saving Solution: Using a fuse reducer instead of replacing an entire fuse holder or switch assembly can shorten downtime and reduce material costs when an ampacity change is required.
  • Easy Specification: Each Bussmann R Series catalog number is a specific model, making it easy to specify and reorder the exact reducer needed for a given clip size and future projects.

Technical Specifications

  • Series: R
  • Refer to manufacturer documentation for complete technical specifications by model.

Typical Applications

  • Fused Disconnect Switches requiring a smaller fuse than the switch's native clip size
  • Panelboards and Switchboards undergoing fuse ampacity changes
  • Industrial Power Distribution Equipment maintained by electrical contractors
  • Planned Fuse Ampacity Downsizing Projects on 250/600 Volt systems
  • Electrical Retrofit, Upgrade, and Maintenance Work where fuse clip hardware must remain in place

Why Bussmann?

Bussmann is a well-established name in circuit protection components, and the R Series fuse reducer line reflects that focus with clearly defined dual amperage and dual voltage ratings built for dependable fuse clip adaptation. Specifying a Bussmann reducer instead of an unbranded substitute helps ensure a secure mechanical fit inside the fuse clip, consistent contact, and predictable performance when adjusting fuse ampacity on professional electrical installations. For contractors and maintenance teams who need to downsize a fuse quickly and reliably, the Bussmann R Series offers a straightforward, purpose-built solution backed by the Bussmann circuit protection product line.

Manufacturer Resources

Product Specs

Product Type:
Fuse Reducer
Voltage Rating:
250/600V
Amperage Rating:
100/200A
Series:
R
Department:
Electrical
Product Subgroup:
Fuse Holders & Blocks
list_batch:
BUSS-20260919
Product Group:
Circuit Protection

Bussmann NO.663-R – Frequently Asked Questions

1) What does a Bussmann R Series fuse reducer actually do in a disconnect switch?
A Bussmann R Series fuse clip reducer seats into the existing fuse clips and narrows the clip spacing so a physically smaller fuse can be held securely in a larger fuse holder. It lets you drop the fuse ampacity in a switch, panelboard, or disconnect without pulling out the fuse holder, switch, or panel hardware. That is why it shows up on retrofits, emergency fuse changes, and planned ampacity downsizing.
2) I need to put a 100A fuse in a 200A fused switch - which Bussmann reducer do I order?
The NO.2621-R is the 100/200-Amp reducer: it fits inside a 200-Amp fuse clip opening and adapts it to hold a 100-Amp fuse. You need a pair logic per fuse clip set, so order by the number of clip positions in the switch.
3) Will a Bussmann R Series fuse reducer work on a 600 volt panelboard?
Yes. Reducers in the R Series are rated up to 250/600 Volt, which covers the common low-voltage industrial and commercial classes found in disconnects, panelboards, and switchboards. Match the reducer's voltage class to the fuse class and the equipment rating before you install it.
4) Which Bussmann R Series reducer catalog numbers are there?
Ten catalog numbers make up the line: NO.213, NO.213-R, NO.226, NO.242-R, NO.2621-R, NO.263-R, NO.2662-R, NO.2664, NO.663, and NO.663-R. Each one is a distinct model matched to a particular clip opening and fuse size, so the catalog number is what you reorder from, not just the series name.
5) Is it better to install a fuse reducer or replace the whole fused switch when I need a smaller fuse?
If the switch itself is sound and only the fuse ampacity has to come down, the reducer is the shorter job: it seats into the clips already in the equipment, so the fuse holder, disconnect, and panel hardware all stay put, which cuts downtime and material cost. Replacing the switch assembly only makes sense if the equipment is at end of life or the new fuse class will not seat in that clip arrangement at all.
6) Can I use a fuse reducer to make a bigger fuse fit a smaller clip?
No. The R Series works one direction only: it adapts an oversized fuse clip opening down to smaller fuse dimensions. If you need a larger fuse than the clips accept, the clip or the switch has to change, not the reducer.
7) How do I pick the right Bussmann reducer catalog number for my fuse clips?
Selection comes down to two measurements on the job: the existing clip opening (the switch's native fuse ampacity and voltage class) and the fuse you intend to install. Match those to the catalog number rated for that step-down, for example the 100/200-Amp NO.2621-R for a 200A clip taking a 100A fuse. Because each of the ten numbers is a fixed model, once you have identified it you can reorder the same part for every future ampacity change on that equipment.
8) Where are Bussmann R Series fuse reducers typically used?
Fused disconnect switches that need a smaller fuse than the native clip size, panelboards and switchboards going through a fuse ampacity change, industrial power distribution gear under contractor maintenance, and retrofit or upgrade work where the existing fuse clip hardware has to stay in place. Typical systems are 250/600 Volt rated distribution.
How fast can I get the Bussmann NO.663-R 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 NO.663-R come with a warranty?
Absolutely. The Bussmann NO.663-R 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 NO.663-R?
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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