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Mersen 632 Class H & K Fuse Reducer, 600VAC/600VDC Rated, 50kA SCCR
Model: MER-632
Mersen 632 Class H & K Fuse Reducer, 600VAC/600VDC Rated, 50kA SCCRThe Mersen 632 Class H & K Fuse Reducer allows Class H and K fuse clips to accept smaller fuse sizes, making it a practical solution...
Mersen
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$50.66
Mersen 162 Class H & K Fuse Reducer, 600V
The Mersen 162 Class H & K Fuse Reducer allows electricians to safely downsize Class H and K fuse holders for smaller fuse installations, maintaining a 600 VAC and 600 VDC voltage rating along with a 50 kA short-circuit current rating (SCCR). Built to UL Listed and CSA Certified standards, this fuse reducer supports Class H, K, and R fuses at 250V and 600V, plus Class J fuses at 600V, making it a versatile solution for panelboard and fusible disconnect configurations.
Key Features
- Voltage Rating: 600 VAC / 600 VDC for use in both AC and DC fusible disconnect applications.
- High SCCR: 50 kA short-circuit current rating supports demanding fault-current environments.
- Multi-Class Compatibility: Accommodates 250V and 600V Class H, K, and R fuses, plus 600V Class J fuses, per UL Listed Guide No. IZZR.
- UL Listed & CSA Certified: Certified under UL File E105670 (IZZR.E105670) and CSA Certification 6225-01 207417 for code-compliant installations.
Certifications & Compliance
- UL Listed — File No. E105670, Guide No. IZZR.E105670
- CSA Certified — 6225-01 207417
- 250V and 600V Class H, K, and R — UL Listed Guide No. IZZR, CSA Certified
- 600V Class J — UL Listed
Technical Specifications
- Ac Voltage: 600 VAC
- Ce Conformity: Consult Technical Services
- Csa Certification: 6225-01 207417
- Dc Voltage: 600 VDC
- Lead Free: Consult Technical Services
- Rohs Compliant: Consult Technical Services
- Sccr: 50 kA
- Standards: 250V and 600V Class H, K, and R - UL Listed Guide No. IZZR, CSA Certified. 600V Class J - UL Listed
- Ul Certification: E105670 IZZR.E105670
Typical Applications
- Panelboard and Fusible Disconnect Switch Wiring
- Fuse Holder Downsizing for Class H, K, R, and J Fuses
- Commercial and Industrial Electrical Distribution Equipment
- Motor Control Centers and Switchgear
- Renovation and Retrofit Fuse Panel Upgrades
Why Mersen?
Mersen is a recognized manufacturer of circuit protection components, and the 162 Fuse Reducer reflects that engineering standard with UL Listed and CSA Certified construction rated to 600 VAC/VDC and 50 kA SCCR. For electrical professionals who need dependable, code-compliant fuse holder adaptation, Mersen delivers consistent performance backed by third-party certification.
Manufacturer Resources
Mersen Product Catalog
Product Specs
- Product Type:
- Fuse Reducer
- Voltage Rating:
- 600V
- Listing:
- UL Listed
- Standards:
- CSA Certified
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Fuse Holders & Blocks
Mersen M-162 – Frequently Asked Questions
1) What does a Mersen 162 fuse reducer actually do in a fusible disconnect?
The Mersen 162 is an adapter that lets a Class H or K fuse clip hold a smaller fuse than the holder was built for. Instead of replacing the switch or panelboard when the load drops, you fit reducers into the existing clips and install the smaller fuse. It is used in panelboards, fusible disconnect switches, motor control centers and switchgear, and on retrofit fuse panel upgrades.
2) Which fuse classes will the Mersen 162 reducer work with?
It covers 250V and 600V Class H, K and R fuses, and 600V Class J fuses. The Class H, K and R coverage is UL Listed under Guide No. IZZR and CSA Certified; the 600V Class J coverage is UL Listed.
3) Can I use the Mersen 162 fuse reducer on a 600V DC circuit?
Yes. The 162 is rated 600 VAC and 600 VDC, so it is good for DC fusible disconnect work as well as AC.
4) Will the Mersen 162 reducer hold up the short-circuit rating on my equipment?
It carries a 50 kA short-circuit current rating, so adding it does not drag the assembly below 50 kA at 600V. If your equipment label states an SCCR above 50 kA, the reducer becomes the limiting component.
5) What is the closest alternative to the Mersen 162 fuse reducer from another manufacturer?
The Littelfuse LRUR Series fuse reducer, also sold as the LRU2 Series, is a fuse clip adapter that serves the same purpose of adapting a fuse clip to a smaller fuse size. The Mersen 162 is rated 600 VAC/600 VDC with a 50 kA SCCR and is UL Listed and CSA Certified for 250V and 600V Class H, K and R fuses plus 600V Class J. Confirm the clip size and fuse class you are adapting before swapping between the two.
6) Should I install fuse reducers or just replace the disconnect with a smaller one?
Reducers are the retrofit route: they let you keep the existing switch, clips and enclosure and run a smaller fuse, which is why they show up on renovation and fuse panel upgrade work. Replacing the disconnect means new wiring terminations and new enclosure prep. If the existing gear is sound and only the fuse size has changed, the 162 is the cheaper path in labor; if the switch itself is damaged or the ampere frame is wrong for the circuit, change the switch.
7) Do fuse reducers come in pairs, and how many do I need for a three-phase disconnect?
A reducer works on one clip, so each fuse position needs two of them, one for each end of the fuse. A three-pole 600V disconnect therefore takes six Mersen 162 reducers to downsize all three phases.
8) I need a fuse reducer for a retrofit where UL and CSA paperwork has to be on file. Which one should I specify?
The Mersen 162 is UL Listed under File No. E105670, Guide No. IZZR.E105670, and CSA Certified under 6225-01 207417, with those listings covering 250V and 600V Class H, K and R fuses and 600V Class J. The Littelfuse LRUR Series is the comparable fuse clip adapter if your specification calls for that series by name. For a submittal package where the certification file numbers must be cited, the Mersen 162 carries both marks.
9) Is a fuse block or fuse holder a substitute for the Mersen 162 fuse reducer?
No. The Mersen 162 is a reducer - it adapts an existing Class H and K fuse clip so a physically smaller fuse can be installed, keeping the 600 VAC/600 VDC rating and 50 kA SCCR of the circuit. A fuse block or holder is the mounting base itself and replaces the clip assembly rather than adapting it. If the goal is to keep the existing panelboard or fusible disconnect and simply run a smaller fuse, the reducer is the part; if the base is being replaced outright, you need a holder or block instead.
10) What is the part number I order for the Mersen Class H and K fuse reducer?
Order it as Mersen 162. That is the manufacturer part number, and the 162 is a single model covering Class H and K fuse clip reduction at 600V.
How fast can I get the Mersen M-162 delivered?
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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 M-162 come with a warranty?
Absolutely. The Mersen M-162 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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