Bussmann Class J & Class R Fus...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$82.95
Bussmann Class J & Class R Fuse Reducer, Multi-Amperage Fuseholder Adapter

Bussmann Class J & Class R Fuse Reducer, Multi-Amperage Fuseholder Adapter

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Model: NO.616-R

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

$82.95
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Bussmann Class J & Class R Fuse Reducer, Multi-Amperage Fuseholder Adapter

This Bussmann Fuse Reducer family is designed to adapt an existing Class J or Class R fuseholder or fuse block down to accept a smaller, correctly rated fuse, giving electrical contractors and maintenance teams a straightforward way to right-size a fuse mounting without replacing the entire fuseholder, switch, or panel assembly. The family is available in a range of amperage reductions, including Class J options such as a 200-Amp holder stepped down to a 100-Amp fuse and a 400-Amp holder stepped down to a 100-Amp fuse, as well as Class R options such as a 100-Amp holder stepped down to a 60-Amp fuse and a 600-Amp holder stepped down to a 400-Amp fuse. Each reducer is rated 600 Volt and is intended for use in industrial and commercial power distribution equipment where Class J or Class R fuse protection is specified. By stepping an existing fuse opening down to a smaller amperage, these reducers help maintain proper fuse clip engagement and a rejection-style fit, so that only a correctly sized fuse of the specified class can be installed in the modified opening, supporting safe, code-compliant overcurrent protection while avoiding the cost and downtime of swapping out fuseholder hardware.

Key Features

  • Amperage Reduction Options: Available in multiple Class J and Class R reductions, from a 200-Amp holder to a 100-Amp fuse up to a 600-Amp holder stepped down to a 400-Amp fuse, allowing a smaller fuse to be used in an existing larger mounting without hardware replacement.
  • Voltage Rating: 600 Volt rating across the family supports use in a wide range of commercial and industrial power distribution circuits.
  • Class-Specific Rejection Fit: Reducer openings are sized specifically for Class J or Class R fuses depending on the selected option, helping ensure only the correct fuse class and amperage can be installed.
  • Retrofit Solution: Eliminates the need to replace an entire fuseholder, fuse block, or disconnect switch when stepping down to a smaller-amperage fuse.
  • Space-Saving Design: Allows existing higher-amperage equipment to remain in service while accommodating downsized loads that only require a smaller-amperage, 600 Volt Class J or Class R fuse.
  • Standardization Support: Helps facility teams standardize on Class J or Class R fuse protection across mixed fuseholder sizes without swapping panel hardware.

Technical Specifications

  • Voltage Rating: 600V
  • Available Reductions: Class J – 200A Holder to 100A Fuse; Class J – 400A Holder to 100A Fuse; Class J – 600A Holder to 400A Fuse; Class R – 100A Holder to 60A Fuse; Class R – 400A Holder to 200A Fuse; Class R – 600A Holder to 100A Fuse; Class R – 600A Holder to 400A Fuse

Typical Applications

  • Industrial and Commercial Power Distribution Equipment
  • Fuse Panel, Switchboard, and Disconnect Switch Retrofits
  • Motor Control Center Overcurrent Protection
  • Downsizing Larger Fuseholders for Reduced Electrical Loads
  • Panelboard Maintenance and Fuse Class Standardization

Why Bussmann?

Bussmann is a trusted name in circuit protection, and this family of Class J and Class R fuse reducers is built to the fit and rejection standards required for reliable, code-compliant fuse installations. Choosing a Bussmann reducer helps ensure proper fuse clip engagement and consistent, dependable performance when adapting a larger fuseholder down to a smaller, correctly rated Class J or Class R fuse. For electricians and facility teams standardizing on Class J or Class R fuse protection, a Bussmann reducer offers a straightforward, code-compliant way to match existing fuseholder hardware to a reduced 600 Volt fuse requirement without a full equipment replacement.

Manufacturer Resources

Product Specs

Product Type:
Fuse Reducer
Amperage Rating:
60A
Voltage Rating:
600V
Configuration:
100-Amp to 60-Amp Reduction
Department:
Electrical
Product Subgroup:
Fuse Holders & Blocks
list_batch:
BUSS-20260919
Class:
J
Product Group:
Circuit Protection

Bussmann NO.616-R – Frequently Asked Questions

1) Can I put a smaller fuse in my existing 400A Class R disconnect without replacing the switch?
That is exactly what a Bussmann fuse reducer does. The Class R 400A holder to 200A fuse reducer, part NO.642-R, fits into the existing 400-amp clips and gives you a mounting that accepts a 200-amp Class R fuse. The switch, fuse block, and panel hardware all stay in place. Bussmann also builds the 600A to 400A (NO.2664-R), 600A to 100A (NO.2661-R), and 100A to 60A (NO.616-R) reductions in Class R.
2) Which Bussmann fuse reducers are made for Class J holders?
Three Class J reductions are offered: J-21 steps a 200-amp holder down to a 100-amp fuse, J-41 steps a 400-amp holder down to a 100-amp fuse, and J-64 steps a 600-amp holder down to a 400-amp fuse. All are 600 volt rated. The remaining reducers in the family are Class R and will not fit a Class J mounting.
3) Can I use a Class R fuse reducer in a Class J fuse block?
No. Class J and Class R fuses have different dimensions and different rejection features, and each reducer opening is sized for one class only. A Class R reducer such as NO.616-R belongs in a Class R holder; for a Class J block you need J-21, J-41, or J-64. Matching the class is the first thing to confirm before you order.
4) Will these fuse reducers work on a 480V motor control center?
Yes. Bussmann Class J and Class R fuse reducers carry a 600 volt rating, which covers 480V and 600V three-phase distribution, MCC buckets, switchboards, and disconnects. They are intended for industrial and commercial power distribution equipment where Class J or Class R protection is specified.
5) My load dropped after a motor change. Is a fuse reducer the right fix, or should I replace the fuse block?
If the holder is already Class J or Class R and only the fuse size needs to come down, a reducer is the cheaper path, it drops into the existing clips and lets a correctly sized smaller fuse be installed without pulling the fuseholder, switch, or panel apart. You would replace the block instead if you are changing fuse class entirely, or if the reduction you need is not one of the seven offered (Class J 200 to 100, 400 to 100, 600 to 400; Class R 100 to 60, 400 to 200, 600 to 100, 600 to 400).
6) Does a fuse reducer keep the rejection feature so someone can't drop an oversized fuse back in?
It does. Each reducer presents a class-specific, rejection-style opening sized to the reduced amperage, so only a correctly rated fuse of that class will seat in the modified mounting. That is one of the reasons facility teams use them rather than shimming, it keeps proper clip engagement and prevents the next person from reinstalling the larger fuse.
7) What do I order to get a 60-amp Class R fuse into a 100-amp fuse clip?
Bussmann NO.616-R. It is the Class R 100-amp holder to 60-amp fuse reduction, rated 600 volts. Reducers are sold per fuse position, so a three-pole disconnect needs three sets.
8) We have mixed fuse sizes across our panels. Can reducers help us standardize?
Yes, that is a common MRO use. By stepping larger openings down, a maintenance team can run one fuse class and a narrower range of amperages across mixed-size holders without swapping panel hardware. Between the Class J and Class R options the family covers reductions from a 100-amp holder down to 60 amps all the way to a 600-amp holder down to 100 amps.
How fast can I get the Bussmann NO.616-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.616-R come with a warranty?
Absolutely. The Bussmann NO.616-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.616-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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