Bussmann NO2641-R NO.2641-R Fu...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$520.80
Bussmann NO2641-R NO.2641-R Fuse Block Reducer, 400A to 100A

Bussmann NO2641-R NO.2641-R Fuse Block Reducer, 400A to 100A

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Model: NO.2641-R

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

$520.80
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Bussmann NO.2641-R Fuse Block Reducer, 400A to 100A

This Bussmann fuse block reducer is engineered to adapt a 400A fuse clip so it can accept a 100A fuse, giving electricians and maintenance teams a practical way to modify circuit protection without swapping out an entire fuse block or panelboard. Identified by the "R" designation in the Bussmann catalog system, this reducer is built to mate with compatible Bussmann fuse holders and distribution equipment sized for 400A fuses. It offers a straightforward path to step down amperage capacity from 400A to 100A while keeping the existing fuse block footprint intact, helping simplify retrofits, upgrades, and load changes on industrial and commercial electrical systems.

Key Features

  • Amperage Reduction: Converts a 400A fuse block or clip to accept a 100A fuse, matching the product's R-style catalog designation.
  • Panel Compatibility: Designed to fit Bussmann fuse blocks and holders originally sized for 400A fuses, allowing installation of a lower-amperage 100A fuse without replacing the block.
  • R Reducer Design: The "R" designation identifies this component as an R-style reducer within the Bussmann fuse accessory catalog.
  • Space-Saving Solution: Eliminates the need to remove and replace an entire fuse block or panelboard section when a lower-ampere fuse rating is required.
  • Application Flexibility: Supports maintenance work, equipment upgrades, and circuit modifications where amperage requirements have changed from the original 400A design.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Panelboards and Switchboards
  • Industrial and Commercial Electrical Distribution
  • Fuse Block Retrofits and Amperage Downgrades
  • Maintenance and Circuit Modification Projects

Why Bussmann?

Bussmann is a widely recognized manufacturer of fuses and fuse holder accessories used throughout industrial and commercial electrical distribution systems. This R-style reducer is built to work within Bussmann's fuse block ecosystem, giving electrical professionals a dependable way to adjust amperage protection from 400A down to 100A while keeping installations organized and code-conscious.

Manufacturer Resources

Product Specs

list_batch:
BUSS-20260919
Product Type:
Fuse Reducer
Amperage Rating:
400A to 100A
Department:
Electrical
Product Subgroup:
Fuse Holders & Blocks
Product Group:
Circuit Protection

Bussmann NO.2641-R – Frequently Asked Questions

1) What does the Bussmann NO.2641-R fuse reducer actually do?
It lets a fuse clip built for a 400A fuse accept a 100A fuse instead. You keep the existing fuse block in place and drop the protection down to 100A, rather than pulling the block or a section of the panelboard to change ampere rating.
2) Will the NO.2641-R reducer fit my existing fuse block, or do I need to replace the block?
No block replacement needed, provided the block or holder is one sized for 400A fuses. The reducer is made to mate with Bussmann fuse blocks and holders originally built for 400A, and it installs into that same clip so the block footprint stays as-is. If your existing block is sized for something other than 400A, this reducer is the wrong part.
3) My load dropped and the panel is fused at 400A. Can I just install a smaller fuse?
Not directly, a 100A fuse won't seat in a 400A clip. That is the gap this reducer closes: it adapts the 400A clip so a 100A fuse can be installed, which is the usual route for maintenance work, equipment changes, and circuit modifications where the original 400A design no longer matches the load.
4) Is a fuse reducer the same thing as a fuse holder or a fuse block?
Different part. A fuse block or holder is what mounts the fuse to the panel; a reducer like the NO.2641-R is an adapter that sits in the existing clips so a lower-rated fuse fits a larger clip size. Buy the reducer when the block is staying and only the ampere rating is changing. If the block itself is damaged or the wrong class, you need a block, not a reducer.
5) What part number do I order for the Bussmann 400A to 100A reducer?
Order Bussmann NO.2641-R. The "R" in the designation identifies it as an R-style reducer in the Bussmann fuse accessory line, and it is the single model offered for the 400A to 100A step-down.
6) Do fuse reducers come in pairs, and how many do I need for a three-phase feeder?
Reducers install per fuse clip pair, so count by the number of fuses you are changing. A three-pole 400A switch fused on all three poles needs the reducer quantity that covers all three fuse positions. The NO.2641-R is catalogued as a single reducer part number, so order the quantity to match your pole count.
7) Where are 400A to 100A fuse reducers typically used?
Panelboards and switchboards, and more broadly industrial and commercial electrical distribution. Common jobs are fuse block retrofits, amperage downgrades, and circuit modification work where the gear was originally built around a 400A fuse.
How fast can I get the Bussmann NO.2641-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.2641-R come with a warranty?
Absolutely. The Bussmann NO.2641-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.2641-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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