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Mersen R162 Class R Fuse Reducer, 600V AC/DC, 200kA SCCR
The Mersen R162 Class R Fuse Reducer delivers reliable circuit protection and panel configuration flexibility for commercial and industrial electrical systems. Rated 600V AC/DC with a 200kA SCCR, this rejection-type Class R fuse reducer is UL Listed and CSA Certified, giving electricians a professional-grade solution for precise fuse sizing inside panels and switchgear. Its design supports 250V and 600V Class H, K, and R applications as well as 600V Class J systems, making it a versatile fit for panel modernization and code-compliance projects.
Key Features
- Class R Design: Rejection-type fuse class prevents incorrect fuse installation and helps maintain system integrity.
- 600V AC/DC Rating: Versatile voltage compatibility for both alternating and direct current applications across diverse electrical systems.
- 200kA SCCR: High short-circuit current rating ensures dependable protection under fault conditions and system stress.
- UL Listed & CSA Certified: Meets rigorous safety standards with E105670 IZZR UL listing and CSA 6225-01 207417 certification for code compliance.
- Multi-Standard Compliance: Supports 250V and 600V Class H, K, and R applications plus 600V Class J systems for broad panel compatibility.
- Professional Construction: Engineered for reliable performance in demanding electrical panel and switchgear applications.
Certifications & Compliance
- UL Listed, Guide No. IZZR, E105670
- CSA Certified, 6225-01 207417
- UL Listed for 600V Class J applications
Technical Specifications
- Class: R
Typical Applications
- Commercial Electrical Panels
- Industrial Switchgear Systems
- Power Distribution Equipment
- Motor Control Centers
- Electrical Service Upgrades
- Panel Modernization Projects
Why Mersen?
Mersen fuse reducers combine proven electrical protection technology with rigorous safety certifications, including UL Listed and CSA Certified standards. The Class R rejection design paired with a 200kA SCCR rating helps ensure reliable performance and code compliance in professional electrical installations where precise circuit protection and system reliability are non-negotiable.
Manufacturer Resources
Mersen Product Catalog
Product Specs
- Ac Voltage:
- 600 VAC
- Ce Conformity:
- Consult Technical Services
- Class:
- R
- Csa Certification:
- 6225-01 207417
- Dc Voltage:
- 600 VDC
- Lead Free:
- Consult Technical Services
- Rohs Compliant:
- Consult Technical Services
- Sccr:
- 200 kA
- Ul Certification:
- E105670 IZZR.E105670
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Type:
- Fuse Reducer
- Product Subgroup:
- Fuse Holders & Blocks
Mersen R162 – Frequently Asked Questions
1) What does a Mersen R162 fuse reducer actually do in a panel?
A fuse reducer like the Mersen R162 lets you install a smaller ampere-rated fuse in a larger fuse clip. Rather than replacing a switch or block because the load is smaller than the clip size, the reducer adapts the existing clips so the correct fuse size can be fitted. That is why it shows up on panel modernization work, service upgrades, motor control centers and switchgear where the original fuse sizing no longer matches the load.
2) Is the Mersen R162 rated for DC circuits as well as AC?
Yes, it carries both ratings: 600 VAC and 600 VDC. So it can go into a DC distribution panel as well as a standard AC panel, up to 600 volts either way.
3) Will the R162 reducer work with Class H and Class K fuses, or only Class R?
The R162 is a Class R rejection-type reducer, and its stated application range covers 250V and 600V Class H, K and R, plus 600V Class J. The Class R rejection feature is the point of it: a non-rejection Class H or K fuse can drop into a Class R clip, but a Class R fuse cannot go into a lower interrupting-rated holder, which is what keeps the wrong fuse out of the circuit.
4) Is the Mersen R162 UL Listed and CSA certified for an inspected commercial install?
Both. It is UL Listed under file E105670, guide IZZR, and CSA certified under 6225-01 207417. The UL Listing also covers 600V Class J applications. Those are the numbers to hand an inspector on a code-compliance job.
5) What is the closest alternative to the Mersen R162 fuse reducer from another manufacturer?
The Littelfuse LRUR Series, also sold as the LRU2 Series, is the comparable fuse clip adapter line. Like the Mersen R162, it is a fuse reducer that adapts larger fuse clips to accept a smaller fuse body. The R162 is a Class R rejection-style reducer rated 600 VAC and 600 VDC with a 200 kA short-circuit current rating, UL Listed under E105670 IZZR and CSA Certified 6225-01 207417. When cross-referencing to the Littelfuse LRUR Series, confirm the specific LRUR part matches the ampere clip size and voltage class of the switch you are working in, since reducers are sized to a specific clip pair.
6) Does the R162 fuse reducer meet the short-circuit current rating my switchgear spec calls for?
It is rated 200 kA SCCR, which is the standard high fault-current figure specified for commercial and industrial distribution equipment. If the drawing calls for a 200 kA available fault current at that point in the system, the R162 meets it at 600V AC or DC.
7) What is the exact part number to order for the Mersen Class R fuse reducer?
Order it as Mersen R162. That is the manufacturer part number, and the R162 is sold as a single model with no finish or size options to specify.
8) What other brand of fuse reducer could I use instead of the Mersen R162?
Littelfuse makes the LRUR Series fuse reducer (also referenced as the LRU2 Series), which is the same kind of fuse clip adapter. Match the reducer to the clip size and fuse size you are actually converting between, since reducers are specific to that pairing.
9) Can I use a fuse reducer instead of replacing the fusible switch when I need a smaller fuse?
That is exactly the job the Mersen R162 does. It is a fuse reducer, not a fuse and not a switch component, so it installs into the existing clips and lets the switch carry a smaller Class R fuse without changing out the disconnect. It is rated 600 VAC and 600 VDC with a 200 kA SCCR, and the Class R rejection design prevents a non-rejection fuse from being installed in its place. If you are standardizing across a facility on a different brand, the Littelfuse LRUR Series covers the same fuse clip adapter function.
10) Does a Class J fuse block work as a substitute for the Mersen R162 reducer?
No. A Class J fuse block is a mounting base that replaces the fuse holder entirely, while the Mersen R162 is a Class R fuse reducer that adapts the clips already in the switch. The R162 is UL Listed for 600V Class J applications in addition to 250V and 600V Class H, K and R, so it can bring a Class J fuse into an existing clip arrangement without swapping the block. If you want a different brand of reducer for the same purpose rather than a block, the Littelfuse LRUR Series is the comparable adapter.
11) Do I need one R162 reducer per fuse, or one per circuit?
Reducers adapt the clips at each end of a fuse, so plan quantity by the number of fuse positions being converted, not by the number of circuits. A three-phase disconnect with three fuses needs reducers for all three positions if every leg is being resized.
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Does the Mersen R162 come with a warranty?
Absolutely. The Mersen R162 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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