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Mersen R632 Class R Fuse Reducer, 60-30A 600V AC/DC
The Mersen R632 Class R Fuse Reducer provides reliable amperage reduction from 60A to 30A in 600V AC/DC electrical systems. This UL Listed and CSA Certified reducer delivers a 200 kA short circuit current rating (SCCR) for demanding commercial and industrial applications, and is engineered for Class R fuse compatibility to ensure proper electrical panel configuration and load management.
Key Features
- 60-30A Reduction Capacity: Enables proper fuse sizing and load protection in electrical distribution systems.
- 600V AC/DC Rating: Versatile voltage compatibility for both alternating and direct current applications up to 600 volts.
- Class R Compatibility: Designed specifically for Class R fuse systems, ensuring proper fit and electrical performance.
- 200 kA SCCR: High short circuit current rating provides robust fault protection and system reliability.
- Professional Standards Compliance: Conforms to 250V and 600V Class H, K, and R requirements plus 600V Class J specifications.
- UL Listed and CSA Certified: Meets rigorous safety standards with UL E105670 IZZR and CSA 6225-01 207417 certifications.
Certifications & Compliance
- UL Listed, Guide No. IZZR, E105670 IZZR.E105670
- CSA Certified, 6225-01 207417
- Conforms to 250V and 600V Class H, K, and R and 600V Class J standards
Technical Specifications
- Class: R
- Ac Voltage: 600 VAC
- Dc Voltage: 600 VDC
- Sccr: 200 kA
- Ul Certification: E105670 IZZR.E105670
- Csa Certification: 6225-01 207417
- Standards: 250V and 600V Class H, K, and R - UL Listed Guide No. IZZR, CSA Certified. 600V Class J - UL Listed
Typical Applications
- Commercial Electrical Panels
- Industrial Distribution Systems
- Manufacturing Facilities
- Data Centers
- Healthcare Facilities
- Educational Institutions
- Municipal Buildings
Why Mersen?
Mersen fuse reducers deliver proven reliability with comprehensive UL and CSA certifications ensuring code compliance and electrical safety. The robust 200 kA SCCR rating and dual 600V AC/DC voltage compatibility provide long-term performance in demanding electrical environments, backed by Mersen's commitment to professional-grade overcurrent protection for commercial and industrial power systems.
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 R632 – Frequently Asked Questions
1) Is the Mersen R632 sold as a pair or a single piece?
The R632 is supplied as a pair, which is what you need for a single fuse (one reducer at each end of the fuseholder). For a three-phase switch with three fuses, you'd need three pairs.
2) Will a Mersen R632 reducer work with Class J or Class H fuses?
No. The R632 is a Class R reducer, built to take a 30A Class R fuse into 60A Class R clips. The Class H, K, R and J references in its standards listing cover the ratings the part is listed under, not a licence to mix fuse classes. Class J fuses have different dimensions and rejection features, so use a J-specific reducer for a J holder.
3) Does using a fuse reducer lower the short circuit rating of my disconnect?
Not with this one. The R632 carries a 200 kA SCCR, which matches what a current-limiting Class R fuse itself is rated to interrupt, so the reducer isn't the weak link in the assembly. The final rating of the switch still comes from the fuse and equipment combination.
4) What is the Littelfuse equivalent to the Mersen R632 fuse reducer?
The Littelfuse LRUR Series fuse reducer, also sold as the LRU2 Series, is the comparable fuse clip adapter line. Both are fuse reducers that adapt a larger fuse clip to accept a smaller-amperage fuse. The Mersen R632 is a Class R reducer taking 60A clips down to 30A, rated 600 VAC and 600 VDC with a 200 kA SCCR, UL Listed under E105670 IZZR and CSA Certified 6225-01 207417. If you are matching an existing panel by amperage step, confirm the LRUR part number covers the same 60A-to-30A step before ordering.
5) Is the Mersen R632 fuse reducer UL Listed and CSA approved for a healthcare or municipal job?
Yes. The R632 is UL Listed under E105670, guide IZZR, and CSA Certified under 6225-01 207417. That covers the paperwork on commercial panels, industrial distribution, data centers, hospitals, schools and municipal buildings.
6) I need to go from 60A clips down to a fuse smaller than 30A. Is the R632 the right reducer?
The R632 covers one specific step: 60A holder down to a 30A Class R fuse. Fuse reducers are sized as a pair of amp ratings, so a different step (100A to 60A, for example) needs a different reducer model. Match the holder rating first, then the fuse rating you intend to install.
7) Can I use a fuse reducer instead of replacing the fusible switch to run a smaller fuse?
Yes, that is the purpose of a reducer like the Mersen R632. It adapts 60A fuse clips to hold a 30A Class R fuse, so an oversized disconnect can protect a smaller load without swapping the switch. The Littelfuse LRUR Series is the alternative fuse clip adapter for the same job. What a reducer does not do is change the switch's own rating - it only changes what fuse the clips accept. Reducers are sold and installed in pairs, one per clip set.
8) Is a fuse block or fuse holder a substitute for the Mersen R632 reducer?
No. The Mersen R632 is a fuse reducer - a clip adapter that lets 60A Class R clips hold a 30A fuse inside equipment you already have. A fuse block or holder is standalone mounting hardware with its own base and terminals, and it replaces the fuse mounting rather than adapting it. If the existing disconnect or panel stays in place, the reducer is the correct part; the Littelfuse LRUR Series fuse clip adapter is the other product in that same reducer category.
9) Can the R632 be used on a 250V panel, or only 600V?
It is rated to 600 volts AC and DC, and the standards it is listed under span 250V and 600V Class H, K and R. Applying a 600V-rated component on a 240V or 480V system is fine; the voltage rating is a ceiling.
10) If my panel has 600V Class J fuses, does the Mersen R632 still apply?
The Mersen R632 is a Class R reducer, and Mersen's reducer standards coverage includes 250V and 600V Class H, K and R under UL Guide No. IZZR and CSA, plus 600V Class J as UL Listed. Class J and Class R clips differ dimensionally, so match the reducer catalog number to the fuse class actually in the clips rather than assuming one part crosses both. The Littelfuse LRUR Series is the comparable adapter line if you are standardizing on a single brand across a facility.
11) Is the Mersen R632 RoHS compliant?
Mersen directs RoHS, CE conformity and lead-free questions on the R632 to their technical services group rather than publishing a blanket statement, so get confirmation in writing if your spec requires it on the submittal.
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Does the Mersen R632 come with a warranty?
Absolutely. The Mersen R632 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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