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Littelfuse LRUR Series Fuse Reducer, Fuse Clip Adapter
The Littelfuse LRUR Series Fuse Reducer, also cross-referenced in Littelfuse catalogs as the LRU2 Series, is available across the LRU216R, LRU226R, and LRU2664R models within Littelfuse's Fuse Reducers product family. These fuse reducers adapt fuse mounting configurations, allowing a smaller-frame fuse to be installed securely into a fuse clip or fuse block that was originally sized for a larger fuse class, without requiring a full fuse block replacement. Electrical professionals and maintenance teams use the LRUR Series as a clear reference point when specifying replacement or upgrade components for power fuse distribution equipment, and keeping the correct reducer on hand helps streamline maintenance on panels that mix multiple fuse sizes within the same fuse block footprint.
Key Features
- Model Range: Available as the LRU216R, LRU226R, and LRU2664R within the LRUR Series, cross-referenced in Littelfuse catalogs as the LRU2 Series.
- Product Family: Classified under Littelfuse's Fuse Reducers family, making it straightforward to identify and order alongside related power fuse accessories.
- Fuse Clip Adaptation: Functions as a reducer, letting a smaller physical fuse size mount into a fuse holder or fuse block designed for a larger fuse class.
- Retrofit-Friendly Design: Installs into the existing fuse block or fuse clip, allowing a size change without rewiring or replacing the surrounding mounting hardware.
- Manufacturer Reliability: Produced by Littelfuse, a widely recognized supplier of circuit protection and power fuse components for industrial and commercial systems.
- Manufacturer Documentation: Detailed technical documentation from Littelfuse is available to help engineers confirm fit and application before specifying a model from this range.
Technical Specifications
- Series: LRUR Series (LRU2 Series)
Typical Applications
- Power Fuse Distribution Equipment
- Fuse Block and Fuse Holder Retrofits
- Industrial and Commercial Power Distribution Panels
- Fuse Mounting Adaptation for Panelboard Upgrades
- Maintenance Stock for Mixed Fuse-Size Installations
Why Littelfuse?
Littelfuse is an established manufacturer of circuit protection and power fuse hardware, and the LRUR Series Fuse Reducer lineup reflects that focus on dependable, code-compliant components. Specifying a Littelfuse Fuse Reducer across the LRU216R, LRU226R, or LRU2664R models helps electrical professionals maintain proper fuse fit and reliable electrical contact when adapting mounting configurations in power distribution equipment. Sourcing the correct reducer from a single, well-documented product family also simplifies future maintenance, since replacement parts and technical documentation remain consistent across the LRUR Series lineup.
Manufacturer Resources
Littelfuse Product Catalog
Product Specs
- Product Type:
- Fuse Reducer
- Series:
- LRUR Series (LRU2 Series)
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Fuse Holders & Blocks
Littelfuse LRU216R – Frequently Asked Questions
1) What does a Littelfuse LRUR Series fuse reducer actually do in a fuse block?
The LRUR Series reducer lets a smaller-frame fuse mount into a fuse clip or fuse block that was originally sized for a larger fuse class. It drops into the existing clips, so you change fuse size without rewiring or swapping the fuse block itself. Littelfuse catalogs also cross-reference the line as the LRU2 Series.
2) Which LRUR fuse reducer do I order for a 200 amp fuse clip?
Three ampere sizes are offered in the LRUR Series: LRU216R at 100A, LRU226R at 200A, and LRU2664R at 600A. For a 200 amp clip the LRU226R is the matching part. Pick the reducer by the ampere rating of the existing clips you are reducing from, not by the smaller fuse going in.
3) Can I use a fuse reducer instead of replacing the whole fuse block when my fuse size changes?
That is exactly what the LRUR Series is for. The reducer installs into the existing fuse block or clips, so a size change needs no rewiring and no replacement of the surrounding mounting hardware. It is a common fix on panelboard upgrades and on panels that mix fuse sizes in one block footprint.
4) What is the closest alternative to a Littelfuse LRUR Series fuse reducer from another manufacturer?
The Mersen R622 Class R Fuse Reducer, rated 600V AC/DC, is the comparable part from Mersen's R Series. Both parts do the same job of letting a smaller-frame fuse mount into a fuse clip or fuse block originally sized for a larger fuse class, without replacing the block. The Littelfuse side is offered as the LRU216R, LRU226R, and LRU2664R; confirm the amperage frame and fuse class of the clip you are adapting before picking either one.
5) I need a 600A fuse reducer - which part should I order?
The Littelfuse LRU2664R is the 600A model in the LRUR Series. The Mersen R622 is a Class R reducer rated 600V AC/DC, which is a voltage class rather than a 600 amp frame, so it is not the part to reach for when you need the larger amperage frame. For a 100A opening the LRU216R applies and for 200A the LRU226R.
6) Are reducers sold in pairs, and how many do I need per fuse?
Reducers work per clip, so a single fuse needs one at each end and a three-phase set needs six. The LRUR Series is ordered by ampere size (LRU216R, LRU226R, LRU2664R), so count the clips you are adapting and order to that count.
7) What is the difference between the Littelfuse LRUR reducer and the Mersen R622 reducer?
Both are fuse reducers for adapting clip size. The Mersen R622 is specified as a Class R reducer rated 600V AC/DC in Mersen's R Series. The Littelfuse LRUR line is offered in 100A, 200A, and 600A sizes under the LRU2 Series designation. If your drawing calls out a Class R reducer specifically, the Mersen R622 is the part described that way.
8) Is a fuse reducer a substitute for a fuse block adapter kit or a new fuse holder?
No. A reducer only changes the clip size a fuse mounts into; it does not change the voltage class of the holder, the bus arrangement, or the panel's wiring. If you need a different fuse class entirely or different line and load terminations, that calls for a new fuse block, not an LRUR reducer.
9) Does a Mersen R622 fuse reducer work in place of a Littelfuse LRU226R?
The Mersen R622 is a Class R fuse reducer rated 600V AC/DC, and the Littelfuse LRU226R is the 200A model in the LRUR Series. Both adapt an existing fuse clip for a smaller fuse, so they are generally considered against each other for the same retrofit. Match the reducer to the fuse class and amperage frame of the block in the panel rather than swapping by brand alone, since a reducer only seats correctly when the clip spacing and fuse class line up.
10) What should I use instead of a fuse reducer if the fuse block itself is the wrong class?
A reducer such as a Littelfuse LRUR Series part or a Mersen R622 Class R reducer only adapts an existing clip for a smaller fuse; it does not change the class of the block or the surrounding mounting hardware. If the block is the wrong class for the circuit entirely, the block gets replaced rather than reduced. Reducers are the right call when you want a size change without rewiring or replacing the mounting hardware already in the panel.
11) Where can I confirm fit before I specify an LRUR reducer for an existing panel?
Littelfuse publishes technical documentation for the Fuse Reducers family, and ZenSupply carries the Littelfuse product catalog PDF alongside the LRUR Series for engineers confirming fuse and clip fit before specifying LRU216R, LRU226R, or LRU2664R.
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Does the Littelfuse LRU216R come with a warranty?
Absolutely. The Littelfuse LRU216R is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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