Mersen 60301J Class J Fuse Bas...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$53.56
Mersen 60301J Class J Fuse Base, 600V 30A Tin-Plated Box Connector

Mersen 60301J Class J Fuse Base, 600V 30A Tin-Plated Box Connector

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Model: 60301J

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

$53.56
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Mersen 60301J Class J Fuse Base, 600V 30A Tin-Plated Box Connector

The Mersen 60301J Class J Fuse Base is a 600V, 30A fuseholder engineered for AJT, A4J, and HSJ Class J fuses used in industrial and commercial power distribution. This fuse base is available in 1-pole and 3-pole configurations, letting you match single-circuit or three-phase protection needs on the same platform. Its glass-filled polycarbonate (GFPC) insulating body delivers verified dielectric strength in excess of 2500V, while box-style wire connectors accept a wide range of stranded or solid copper or aluminum conductors. Backed by UL Listing and CSA Certification with a 200kA short-circuit current rating, this fuse base is built for demanding, code-compliant electrical installations.

Key Features

  • Ampere Rating: 30A max fuse rating sized for Class J fuses including AJT, A4J, and HSJ types.
  • Pole Configurations: Available in 1-pole and 3-pole versions to suit single or three-phase circuits.
  • Durable Construction: Glass-filled polycarbonate (GFPC) insulating body with dielectric strength exceeding 2500V for reliable isolation.
  • Wire Connections: Box-style connectors accommodate stranded or solid copper or aluminum conductors, torqued to 35 lb-in.
  • Voltage Rating: Rated 600V AC/DC for demanding industrial and commercial circuits.
  • Fuse Installation: Clip-in design with high-conductivity tin-plated copper fuse clips for secure fuse retention.
  • Operating Temperature: Rated from -25°C to 80°C for storage and operation.
  • Short-Circuit Current Rating: 200kA SCCR supports high fault-current applications.

Certifications & Compliance

  • UL Listed, Guide IZLT, File E52283
  • Meets UL4248 (formerly UL512) requirements for Class J fuse blocks
  • CSA Certified, Class 6225, File 32169

Technical Specifications

  • Rated Voltage: 600V AC/DC
  • Ampere Rating: 30A
  • Body Insulating Material: GFPC
  • Wire Connections: Box
  • Torque Rating: 35 lb-in
  • Short Circuit Current Rating (SCCR): 200kA
  • Fuse Installation Method: Clip-in
  • Frequency: 50/60 Hz
  • Installation Mounting: Direct Screw Mount
  • Country of Origin: Mexico
  • Number of Poles Available: 1, 3

Typical Applications

  • Industrial Power Distribution Panels
  • Motor Control Centers
  • Class J Fuse Protection Circuits
  • Commercial and Industrial Electrical Installations
  • Panelboard and Switchboard Wiring

Why Mersen?

Mersen Class J fuse bases combine a GFPC insulating body, high-conductivity tin-plated copper fuse clips, and a 200kA SCCR to deliver reliable, code-compliant fuse protection across both 1-pole and 3-pole configurations. With UL Listing and CSA Certification backing every unit, these fuse bases are built for professional electrical work where dependable short-circuit protection and secure box-style terminations are essential.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Rated voltage DC UL:
600 V
Torque Rating:
35 lb-in
Ampere Rating:
30 A
Body/Insulating Material:
GFPC
Max Operating Temp:
80 °C
Max Storage Temp:
80 °C
Wire Connections:
Box
Product Line:
Class J Fuseholders - Class J
Frequency (Hz):
50/60 Hz
Installation Mounting:
Direct Screw Mount
Max Fuse Rating:
30 A
Fuse Installation Method:
Clip-in
Rated voltage AC UL:
600 V
Min Storage Temp:
-25 °C
Short Circuit Current Rating Sccr:
200 kA
list_batch:
MERSEN-20260825
Product Type:
Fuse Base
Department:
Electrical
Product Group:
Circuit Protection
Product Material:
GFPC
Product Finish:
Tin-Plated
Voltage Rating:
600V
Amperage Rating:
30A
Connection Type:
Box
Listing:
UL Listed
Product Subgroup:
Fuse Holders & Blocks

Mersen 60301J – Frequently Asked Questions

1) Which fuses fit the Mersen 60301J Class J fuse base?
The 60301J is built for Class J fuses rated up to 30A at 600V, including Mersen AJT, A4J and HSJ types. Class J fuses have their own dimensions and rejection features, so a 30A Class R or Class CC fuse will not seat in these clips. If your circuit needs more than 30A, you need a larger Class J fuse base, not this one.
2) Does the Mersen 60301J fuse base come in a three-phase version?
Yes. The Class J fuse base is offered in 1-pole and 3-pole configurations, so you can use the same platform for a single-circuit feeder or for three-phase motor branch protection. The 3-pole version is the one to order for a motor control center or three-phase panel; poles are fixed at build, so decide before you order.
3) What is the difference between the Mersen 60301J and 60303J fuse bases?
They are the same 600V, 30A Class J fuse base in two sizes: the 60301J is the 3/8-inch size and the 60303J is the 1/2-inch. Everything else, GFPC body, tin-plated copper clips, box connectors and 200kA SCCR, is common to both.
4) Can I use this Mersen Class J fuse base on a 480V or 600V three-phase industrial panel?
Yes. It carries a 600V rating on both AC and DC under UL, with a 50/60 Hz frequency rating, so 208V, 240V, 480V and 600V AC systems are all within rating. The 200kA short-circuit current rating covers service-entrance and MCC locations with high available fault current.
5) What wire can I land on the Mersen 60301J fuse base and what torque do I use?
Box-style connectors take stranded or solid copper or aluminum conductors, and the terminal torque spec is 35 lb-in. Set a torque screwdriver to that value, since loose terminations on an aluminum conductor are the usual cause of heating at a fuse block.
6) Is the Mersen 60301J fuse base UL Listed and CSA certified for inspected work?
It is UL Listed under Guide IZLT, File E52283, and meets UL4248 (formerly UL512) for Class J fuse blocks. It is also CSA Certified, Class 6225, File 32169. That covers both US and Canadian inspected installations.
7) Can this fuse base be installed in a hot plant room or an unheated outdoor enclosure?
Operating and storage temperature runs from -25 C to 80 C, so a hot MCC room or a cold unheated building is within range. The body is glass-filled polycarbonate with dielectric strength verified above 2500V, which is what holds up the isolation at elevated temperature.
8) Why choose a Class J fuse base instead of a Class R block for a motor circuit?
Class J fuses are physically smaller than Class R for the same ampere rating and carry rejection features that stop a lower-interrupting fuse being fitted in their place. That is why Class J shows up in motor control centers and panelboards where space is tight and fault current is high, and this base backs it with a 200kA SCCR. If your existing holder is Class R, the fuses are not interchangeable, so the block has to change with the fuse class.
How fast can I get the Mersen 60301J 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 60301J come with a warranty?
Absolutely. The Mersen 60301J 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 60301J?
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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