You may also like
Mersen R132 Class R Fuse Reducer, 600V AC/DC, 200kA SCCR
The Mersen R132 Class R Fuse Reducer delivers reliable fuse size reduction for professional electrical distribution systems. Engineered for 600V AC/DC applications with a 200kA SCCR rating, this Class R, current-limiting reducer is UL Listed and CSA Certified for use in demanding electrical distribution environments where precise fuse sizing and protection coordination are essential.
Key Features
- 600V AC/DC Rating: Versatile voltage compatibility supports both alternating and direct current applications for flexible installation options.
- 200kA SCCR: High short-circuit current rating ensures reliable protection performance in high-fault current electrical systems.
- Class R Design: Current-limiting fuse class provides enhanced arc fault protection and improved system coordination.
- UL Listed & CSA Certified: Dual safety certifications ensure compliance with North American electrical standards and code requirements.
- Professional Grade Construction: Mersen engineering delivers consistent performance and long-term reliability in critical electrical applications.
Certifications & Compliance
- UL Listed (Guide No. IZZR, File E105670)
- CSA Certified (6225-01 207417)
- 250V and 600V Class H, K, and R standards; 600V Class J UL Listed
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
Typical Applications
- Industrial Electrical Distribution Systems
- Commercial Power Distribution Panels
- Manufacturing Facility Protection Coordination
- Electrical Contractor Installations
- Maintenance and Retrofit Projects
Why Mersen?
Mersen Class R Fuse Reducers combine proven engineering with comprehensive safety certifications including UL Listed and CSA Certified approvals. The 200kA SCCR rating and dual 600V AC/DC voltage compatibility demonstrate Mersen's commitment to delivering professional-grade electrical protection components that meet the demanding requirements of modern electrical distribution systems, giving contractors and facility engineers a dependable, code-compliant fuse reduction solution.
Manufacturer Resources
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:
- Wiring Devices
- Product Type:
- Fuse Reducer
Mersen R132 – Frequently Asked Questions
1) What does a Class R fuse reducer like the Mersen R132 actually do in a panel?
A fuse reducer lets you install a smaller amp-rating fuse in a fuse clip sized for a larger one. The Mersen R132 is a Class R reducer, so it adapts Class R fuse clips down to a smaller Class R fuse case size without changing out the switch or disconnect. It is the standard fix when a disconnect is oversized for the load you are actually protecting and you need correct fuse sizing for coordination.
2) Can the Mersen R132 fuse reducer be used on a 600V DC circuit, or is it AC only?
Both. The R132 carries a 600 VAC and a 600 VDC rating, so it works in DC distribution as well as standard 600 volt AC gear.
3) Will a Mersen R132 reducer hold up in a panel with a high available fault current?
The R132 is rated 200 kA SCCR, which covers service entrance and industrial switchgear locations where available fault current is high. Pair it with a current-limiting Class R fuse so the assembly's interrupting rating is maintained.
4) Is the Mersen R132 fuse reducer UL Listed and CSA approved for a code inspection?
Yes. The R132 is UL Listed under file E105670, category IZZR, and CSA Certified under 6225-01 207417. Those are the numbers to hand an inspector or put on a submittal.
5) Can I use the R132 reducer with Class J or Class H fuses?
No. The R132 is a Class R device and must be used with Class R fuses in Class R clips. Class J and Class H or K fuses use different case dimensions and rejection features, so they will not seat correctly in a Class R reducer. The Mersen reducer line as a whole covers 250V and 600V Class H, K and R plus 600V Class J, so if you need J or H, order the reducer built for that class rather than the R132.
6) What is an equivalent to the Mersen R132 fuse reducer from another manufacturer?
The closest cross-brand equivalent is the Littelfuse LRUR Series fuse reducer, also sold as the LRU2 Series, which is a fuse clip adapter serving the same purpose: letting a smaller fuse mount in a larger fuse clip. The Mersen R132 is a Class R reducer rated 600 VAC and 600 VDC with a 200 kA SCCR, UL Listed under E105670 (guide IZZR) and CSA Certified under 6225-01 207417. When cross-referencing, match the reducer to the amp rating of the existing clip and the amp rating of the fuse going into it, since reducers are sold as clip-size-specific pairs rather than as one universal part.
7) What part number do I order for the Mersen Class R 600V reducer?
Order it as Mersen R132. That is the manufacturer part number for the 600V AC/DC Class R reducer, and reducers are supplied per fuse holder position, so count the poles you are converting.
8) Is there an alternative to the Mersen R132 if I need a different fuse clip adapter?
Littelfuse builds the LRUR Series (also referenced as the LRU2 Series) fuse reducer and fuse clip adapter, which is the cross-brand counterpart for reducing fuse clip size. Match the class, voltage and the two amp ratings you are stepping between when you pick between the two.
9) Can I use a fuse reducer in a 480V motor disconnect that is oversized for the motor?
That is exactly the case the R132 is built for. Rated 600 VAC, it covers 480V systems, and it lets you drop a correctly sized Class R fuse into a larger disconnect's clips instead of replacing the disconnect. Common on manufacturing retrofits where a machine was downsized but the existing switch stayed.
10) What looks like a substitute for the Mersen R132 but is not?
A fuse of a different class is the common mistake. The R132 is a Class R reducer, meaning it is an adapter that changes the fuse size a clip will accept - it is not a fuse and provides no overcurrent protection on its own. Class J, Class H and Class K hardware is dimensionally different from Class R and will not give you the rejection feature Class R clips rely on. A Littelfuse LRUR Series clip adapter is a genuine like-for-like alternative because it is the same type of device; a fuse block, a fuse holder, or a fuse of a smaller amperage are not, even though buyers reach for them when a small fuse will not seat in a large clip.
11) For a DC circuit, is the Mersen R132 or the Littelfuse LRUR the right choice?
The Mersen R132 is rated for both 600 VAC and 600 VDC, so it is qualified for direct current distribution as well as AC, and it carries a 200 kA SCCR for high fault current systems. The Littelfuse LRUR Series, also shown as LRU2 Series, is a fuse clip adapter of the same type, so for a DC application confirm the specific LRUR part carries a DC rating at or above your system voltage before you spec it. If the circuit is DC and you want the rating stated up front, the R132 answers that question directly.
12) Does the Mersen R132 reducer meet RoHS or lead-free requirements for my spec?
RoHS status, CE conformity and lead-free content on the R132 are handled by Mersen technical services rather than a blanket published value, so on a project that requires documented RoHS or lead-free compliance, get the statement for the specific lot from Mersen before you submit.
How fast can I get the Mersen R132 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 Mersen R132 come with a warranty?
Absolutely. The Mersen R132 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 Mersen R132?
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
Why buy the Mersen R132 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.