Mersen Class J Fuse Block, 600...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$186.96
Mersen Class J Fuse Block, 600VAC/600VDC, 60A, 3-Pole, Box Connector

Mersen Class J Fuse Block, 600VAC/600VDC, 60A, 3-Pole, Box Connector

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Model: FB60J60B3

In Stock (leaves warehouse same day if ordered before 3pm ET)

$186.96
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Mersen Class J Fuse Block, 600VAC/600VDC, 60A, 3-Pole, Box Connector

Mersen's Generation 2 open-style Class J fuse block accommodates Class J fuses from 0-100A at 600V, giving panel builders a compact, DIN-rail mountable base rated 60A, 600VAC/600VDC, 3-Pole with box-style connectors. Dovetail nesting allows fast multipole field assembly, and the fuse base is IP20 rated when paired with Mersen's dead front covers, making it a dependable choice for demanding industrial power distribution.

Key Features

  • Ampere Rating: 60A continuous with a Max Fuse Rating of 60A for reliable overcurrent protection.
  • Voltage Rating: 600V AC (UL) and 600V DC (UL), suitable for AC/DC circuits at 50/60 Hz.
  • Poles: 3-Pole configuration for three-phase and multi-circuit installations.
  • Connection/Terminal Type: Box connector with Tin-Plated Copper terminal material, accepting a wiring range of 2-14.
  • Body/Insulating Material: Glass Filled Polycarbonate housing for durable, high-strength insulation.
  • Mounting: DIN-rail mountable with Direct Screw Mount installation and dovetail nesting for multipole field assembly.
  • Fuse Installation Method: Clip-in design compatible with Class J fuses ranging from 0-100A, 600V.
  • Short Circuit Current Rating (SCCR): 200 kA for high fault-current applications.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Connection/Terminal Type: Box
  • ROHS Compliant: Yes

Typical Applications

  • Industrial and Commercial Power Distribution Panels
  • Motor Control Centers
  • Panelboards Requiring Class J Fuse Protection
  • OEM Equipment Requiring High SCCR Ratings
  • Multipole Field-Assembled DIN-Rail Fuse Systems

Why Mersen?

Mersen's Generation 2 Class J fuse block combines a glass filled polycarbonate body, tin-plated copper terminals, and a 200 kA short circuit current rating to deliver dependable, code-compliant overcurrent protection for demanding electrical systems. The RoHS-compliant construction and IP20-rated base with dead front covers support safe, efficient installation for professional electrical work.

Manufacturer Resources

Mersen Product Catalog

Product Specs

list_batch:
MERSEN-20260825
Product Type:
Fuse Block
Product Material:
Glass Filled Polycarbonate
Connection Type:
Box
Voltage Rating:
600V
Amperage Rating:
60A
Configuration:
3-Pole
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuse Holders & Blocks

Mersen FB60J60B3 – Frequently Asked Questions

1) What size Class J fuses will the Mersen FB60J60B3 fuse block take?
The FB60J60B3 is built on Mersen's Generation 2 Class J base, which accepts clip-in Class J fuses from 0 to 100A at 600V, but this particular block is rated 60A continuous with a maximum fuse rating of 60A. So don't put anything larger than a 60A Class J element in it, even though the base geometry covers the wider range.
2) Can I swap a Class R or Class G fuse block for this Class J block?
No. Class J, Class R, and Class G fuses have different dimensions and rejection features, so the clips are not interchangeable. If your panel is already specified for Class R, the Littelfuse LFR60030-3CID is a 600V 30A Class R block; for Class G at 600V 15A there's the Littelfuse LFG60015-1SQDINR on DIN rail. To use the Mersen FB60J60B3 you need Class J fuses sized to 60A or less.
3) What wire size does the box connector on this Mersen fuse block accept?
The box-style terminals take a wiring range of 2 through 14 AWG, and the terminal material is tin-plated copper. That span covers a 60A feeder in copper as well as smaller control conductors, so you can land typical 6 AWG or 4 AWG branch wire without an adapter lug.
4) Is this fuse block finger-safe, or do I need a cover?
It ships as an open-style base. It reaches IP20 only when Mersen's dead front covers are fitted, so if your panel requires finger-safe terminals you need to order the covers separately. If you want a block that is finger-safe out of the box, the Bussmann CHCC2DIU is a finger-safe modular Class CC block with indication, though it's Class CC rather than Class J.
5) I have a 3-phase 60A feeder. Is one block enough or do I need three?
One FB60J60B3 covers all three phases. It is a 3-pole block, so it holds three 60A Class J fuses in a single housing. For a three-phase four-wire circuit you'd still handle the neutral separately, since this block only fuses the three ungrounded conductors.
6) If the panel drawing calls for Class R fuses instead of Class J, what 3-pole block should be used?
The Mersen FB60J60B3 is built for Class J fuses only, with clip-in fuse installation for Class J 0-100A, 600V, so it will not take a Class R fuse. For a Class R opening, the Littelfuse LFR60030-3CID is a Class R fuse block rated 600V 30A in a 3-pole arrangement. Fuse class is dimensionally rejecting by design, so the block has to match the class on the drawing rather than just the voltage.
7) Is a Bussmann Class CC modular block a substitute for the Mersen FB60J60B3?
No. The Bussmann CHCC2DIU is a 2-pole Class CC modular fuse block with a finger-safe body and a blown-fuse indicator, built around Class CC fuses. The Mersen FB60J60B3 is a 3-pole Class J block rated 60A at 600VAC/600VDC with box connectors. Class CC fuses top out well below the Class J range the Mersen block accepts, and the pole count differs, so the two are not interchangeable on a three-phase 60A feeder.
8) Can the Mersen Class J fuse block be used on a 1000 Vdc solar string?
No. The Mersen FB60J60B3 is rated 600V AC and 600V DC, which is below a 1000 Vdc PV array. For that application the Bussmann CHPV2 Series photovoltaic fuse block is a modular two-pole block rated 1000 Vdc. PV combiner circuits also typically call for a two-pole arrangement per string rather than the Mersen block's 3-pole layout.
9) How does this Class J block mount in a panel, and can I add more poles later?
It is DIN-rail mountable and can also be direct screw mounted to a subpanel. The housing has dovetail nesting, so additional blocks snap alongside it for field-assembled multipole arrangements rather than requiring a factory-built gang. If you need a bolt-in rather than DIN or screw base, the Littelfuse LD Series POWR-BLOKS is a bolt-in mount fuse block.
10) Will a 200kA SCCR fuse block satisfy my equipment short circuit current rating?
The Mersen Generation 2 Class J block is rated 200 kA SCCR, which is the top of the range used for industrial control panel and OEM equipment labeling under high available fault current. Class J fuses are current-limiting, which is what lets the assembly carry that number.
11) Is a Class J block the right choice for a motor control panel?
Class J is the usual pick when you need current-limiting protection in a smaller footprint than Class R, which is why these blocks turn up in motor control centers, industrial and commercial distribution panels, and OEM equipment that needs a high SCCR on the nameplate. If the panel is a photovoltaic DC application instead, a PV-specific block like the Bussmann CHPV2 Series, rated 1000 Vdc, is the correct family rather than a 600V Class J block.
12) What is the exact part number for the Mersen 60A 3-pole Class J fuse block with box connectors?
Order Mersen FB60J60B3. That designation covers the 600VAC/600VDC, 60A, 3-pole Generation 2 Class J base with box-style terminals. Dead front covers are a separate order if you need the IP20 finger-safe configuration.
13) Our control circuit only needs 15A at 600V on a DIN rail. Is the Mersen 60A Class J block overkill?
The Mersen FB60J60B3 is a 60A, 600V, 3-pole Class J block with box connectors and a 200 kA SCCR, sized for feeder and motor-circuit duty. For a smaller single-pole control branch, the Littelfuse LFG60015-1SQDINR is a Class G block rated 600V 15A for DIN rail mounting. Class G fuses are a different, smaller rejection size than Class J, so the fuse stocked for the job changes with the block.
14) We mount fuse blocks to a subpanel with screws, not DIN rail. Is there an alternative to the Mersen Class J block?
The Mersen FB60J60B3 supports both DIN-rail mounting and direct screw mount, so it already covers a flat subpanel. If you prefer a bolt-in style block instead, the Littelfuse LD Series POWR-BLOKS is a bolt-in mount fuse block. The trade-off is that the Mersen block's dovetail nesting lets you field-assemble poles side by side, which a bolt-in block does not offer.
15) We need more than three poles on one assembly. What are the options besides the Mersen Class J block?
The Mersen FB60J60B3 is a 3-pole block, but its dovetail nesting lets you join blocks for multipole field assembly, so additional poles are built by ganging. If you instead want a single block supplied in a wider pole count, the Bussmann 3833 Series AGC fuse block comes in 1 to 8-pole configurations, though it is built for AGC glass fuses rather than Class J.
16) What is the body made of on this Mersen fuse block, and is it RoHS compliant?
The housing is glass filled polycarbonate, chosen for dielectric strength and mechanical toughness in a panel environment, with tin-plated copper terminals. The block is RoHS compliant, which matters if you're building equipment for export or for a customer with a restricted-substances spec.
How fast can I get the Mersen FB60J60B3 delivered?
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Can I return it if it doesn’t work for me?
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Does the Mersen FB60J60B3 come with a warranty?
Absolutely. The Mersen FB60J60B3 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 FB60J60B3?
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