Mersen Class R Fuse Block, Box...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$58.07
Mersen Class R Fuse Block, Box Connector, Glass Filled Polycarbonate

Mersen Class R Fuse Block, Box Connector, Glass Filled Polycarbonate

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Model: 60306R

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

$58.07
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Mersen Class R Fuse Block, Box Connector, Glass Filled Polycarbonate

The Mersen Class R Fuse Block delivers dependable circuit protection for demanding electrical systems, featuring a box connector design and rated 60A at 250VAC/250VDC across a 3-Pole configuration. Built from glass filled polycarbonate with a reinforced clip-in fuse retention design and direct screw mount installation, this fuse block carries a 200 kA short circuit current rating (SCCR) for high fault-current applications. Class R fuse compatibility ensures correct fuse selection and rejection features, while RoHS compliant construction supports responsible manufacturing standards.

Key Features

  • 60A Amperage Rating: Handles substantial electrical loads with reliable current protection for demanding circuits.
  • Dual Voltage Capability (250VAC/250VDC): Consistent 250V performance across both AC and DC applications.
  • 3-Pole Configuration: Provides multi-circuit protection in a single compact fuse block assembly.
  • Class R Fuse Compatibility: Ensures proper fuse selection and rejection features for enhanced safety and code compliance.
  • 200 kA Short Circuit Current Rating (SCCR): Delivers exceptional fault current interruption capability for high-demand electrical systems.
  • Durable Construction: Glass filled polycarbonate body provides superior insulation properties and mechanical strength for long-term reliability.
  • Reinforced Clip-In Design: Simplifies fuse installation and replacement while ensuring secure fuse retention.
  • Direct Screw Mount Installation: Rated to a 45 lb-in torque specification for a secure, code-compliant mounting.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • AC or DC: AC/DC
  • Ampere Rating: 60 A
  • Body Insulating Material: Glass Filled Polycarbonate
  • Frequency: 50/60 Hz
  • Fuse Class: Class R
  • Fuse Installation Method: Clip-in
  • Installation Mounting: Direct Screw Mount
  • Max Fuse Rating: 60 A
  • Number of Poles: 3-Pole
  • Product Height: 2.12 in
  • Product Length: 4.75 in
  • Product Width: 4.08 in
  • Product Weight: 0.45 lb
  • Rated Voltage (AC): 250 V
  • Rated Voltage (DC): 250 V
  • RoHS Compliant: Yes
  • Short Circuit Current Rating (SCCR): 200 kA
  • Torque Rating: 45 lb-in

Typical Applications

  • Industrial Control Panels
  • Commercial Electrical Distribution
  • Motor Control Centers
  • Power Distribution Equipment
  • Manufacturing Facilities
  • Process Control Systems
  • Electrical Switchgear Applications

Why Mersen?

Mersen fuse blocks deliver professional-grade reliability with RoHS compliant construction and precision engineering. The glass filled polycarbonate body provides exceptional insulation while the reinforced clip-in design ensures secure fuse retention, and the 45 lb-in torque rating combined with a 200 kA short circuit current rating meets the demanding requirements of professional electrical installations.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Product Type:
Fuse Block
Product Material:
Glass Filled Polycarbonate
Voltage Rating:
250V
Amperage Rating:
60A
Configuration:
3-Pole
Connection Type:
Screw Mount
Standards:
RoHS Compliant
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuse Holders & Blocks

Mersen 60306R – Frequently Asked Questions

1) Will a Mersen Class R fuse block hold non-rejection Class H or K fuses?
No. The Mersen fuse block is built with Class R clips, which include the rejection feature that blocks a non-current-limiting Class H or K fuse from seating. Only Class R fuses (RK1 or RK5) up to 60A will clip in. That rejection is the point of the block: it keeps someone from dropping a low-interrupting fuse into a circuit that was engineered around a 200 kA short circuit current rating.
2) What's the difference between Mersen 20608 and 20608R fuse blocks?
Both are 3-pole Class R blocks, and the difference is the voltage class. The 20608R is rated 250VAC/250VDC, the 20608 is rated 600VAC/600VDC. Order the 600V version for a 480V or 600V panel; the 250V version is limited to circuits at or below 250 volts. There's also a single-pole 600V block, Mersen 60306R, if you're only protecting one ungrounded conductor.
3) Does this fuse block meet the 200 kA SCCR my panel drawing calls for?
The Mersen Class R block carries a 200 kA short circuit current rating. Getting that rating in practice depends on the fuse: the block is rated in combination with a current-limiting Class R fuse, which is exactly what the rejection clips enforce. It is also RoHS compliant, which covers most manufacturing spec sheets on industrial builds.
4) Can I use this Mersen fuse block on a DC circuit, not just AC?
Yes. The Mersen Class R block is rated for both AC and DC service at the same voltage, 250VAC/250VDC on the 250V version and 600VAC/600VDC on the 600V version, at 50/60 Hz on the AC side. Bear in mind the fuse itself has to carry its own DC rating; the block's rating does not extend a fuse that is AC-only.
5) What torque do I tighten the terminals and mounting screws to on this Mersen fuse block?
45 lb-in is the stated torque rating for the block. Use a torque screwdriver rather than feel: glass filled polycarbonate is strong but over-torquing a screw into it strips the boss, and under-torquing a 60A connection is how you get a hot joint in a control panel.
6) Is a box connector fuse block the right choice, or do I need a fuse holder with a pull-out?
A box connector block like the Mersen Class R takes the conductor directly under a screw clamp and holds the fuse in open clips, so you kill power at the disconnect and pull the fuse by hand. It's the standard choice inside a control panel or motor control center where a disconnect is already upstream. If you need the ability to break the circuit at the fuse itself without opening a separate disconnect, you want a pull-out or switched fuse holder instead, not this block.
7) Is a Leviton or Bryant wiring connector an alternative to a Mersen Class R fuse block?
No. The Mersen 20608 is a Class R fuse block that holds and retains fuses on a screw-mounted glass filled polycarbonate body for overcurrent protection in a panel. The Leviton 15W33 is an industrial grade straight blade connector and the Bryant 8269T is a hospital grade NEMA 5-15R connector; both are cord-end devices for making a plug-and-receptacle power connection and neither accepts a fuse or provides circuit protection. If the job calls for fuse holding, the fuse block is the part; if it calls for terminating a cord, the straight blade or hospital grade connector is.
8) We need a fused disconnect point in an outdoor enclosure - does the Mersen 20608 work there or do we need a weatherproof fitting?
The Mersen 20608 fuse block is an open, screw-mounted device intended to be installed inside an enclosure or control panel; it provides no weather protection itself. Where the raceway or cord enters the enclosure, a weatherproof wiring connector fitting such as the Bryant WPC series handles the sealed entry. The two are used together rather than in place of one another: the WPC fitting seals the penetration, the 20608 carries the Class R fuses and the 60A, 250V, 3-pole load inside.
9) Is this Mersen fuse block the same thing as an industrial grade wiring connector like the Leviton 15W33?
No, and they don't substitute for each other. The Mersen part is a panel-mounted Class R fuse block that holds fuses and lands conductors under screws inside an enclosure. The Leviton 15W33 industrial grade straight blade connector is a cord-end device, 3-wire 2-pole at 125V 20A, for plugging equipment in. Same word, connector, entirely different job.
How fast can I get the Mersen 60306R 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 60306R come with a warranty?
Absolutely. The Mersen 60306R 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 60306R?
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
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