Mersen 60300J Class J Fuse Bas...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$51.13
Mersen 60300J Class J Fuse Base, Reinforced Clip, Tin-Plated Copper

Mersen 60300J Class J Fuse Base, Reinforced Clip, Tin-Plated Copper

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Model: 60300J

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

$51.13
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Mersen 60300J Class J Fuse Base, Reinforced Clip, Tin-Plated Copper

The Mersen 60300J is an open-style Class J fuse base built to accept fuses rated up to 30A at 600V AC/DC, providing a dependable foundation for industrial and commercial power distribution circuits. This model is offered across a family of pole configurations, including 2-pole, 3-pole, and Standard versions, so the correct base can be matched to the specific circuit and panel layout on the job. Every version shares the same core construction: high-conductivity, tin-plated copper fuse clips with a spring-reinforced design for secure, low-resistance fuse retention, a box-style connector that accepts stranded or solid copper or aluminum wire, and a molded glass-filled polycarbonate (GFPC) insulating body. Backed by CSA certification and UL listing to UL4248 (formerly UL512), this fuse base is engineered for reliable, code-compliant performance in demanding electrical environments.

Key Features

  • Ampere Rating: Rated for Class J fuses up to 30A for dependable overcurrent protection.
  • Voltage Rating: Rated 600V AC/DC for use in demanding industrial and commercial power distribution systems.
  • Pole Configuration Options: Available in 2-pole and 3-pole configurations, as well as a Standard version, to suit a range of circuit and panel requirements.
  • Reinforced Fuse Clips: High-conductivity, tin-plated copper fuse clips with spring-reinforced construction for a secure, low-resistance fuse connection.
  • Box Connector: Accepts a wide range of stranded or solid copper or aluminum wire for flexible field wiring.
  • Insulating Material: Molded glass-filled polycarbonate (GFPC) body with dielectric strength in excess of 2500V for reliable electrical isolation.
  • Short Circuit Current Rating: 200kA SCCR supports use in systems with high available fault current.
  • Operating Temperature Range: Rated from -25°C to 80°C for stable performance across ambient conditions.
  • Frequency Rating: Suitable for 50/60Hz electrical systems.

Certifications & Compliance

  • CSA Certified, Class 6225, File 32169
  • Meets the requirements of UL4248 (formerly UL512)
  • UL Listed, Guide IZLT, File E52283

Technical Specifications

  • Ampere Rating: 30 A
  • Max Fuse Rating: 30 A
  • Fuse Installation Method: Clip-in
  • Rated Voltage AC (UL): 600 V
  • Rated Voltage DC (UL): 600 V
  • Short Circuit Current Rating (SCCR): 200 kA
  • Max Operating Temp: 80 °C
  • Min Storage Temp: -25 °C
  • Max Storage Temp: 80 °C
  • Frequency: 50/60 Hz
  • Country of Origin: Mexico

Typical Applications

  • Industrial Power Distribution Panels
  • Motor Control Centers
  • Disconnect Switches and Safety Switches
  • Panelboards and Switchboards
  • OEM Equipment Fusing
  • Class J Fuse Protection Systems

Why Mersen?

Mersen fuse bases combine high-conductivity, tin-plated copper clips with a spring-reinforced design and durable GFPC insulation rated for dielectric strength in excess of 2500V, delivering secure, low-resistance fuse connections across every pole configuration in the family. With CSA certification and UL listing to UL4248, this Class J fuse base is built for reliable, code-compliant performance in professional electrical installations where consistent fuse retention and a high 200kA short circuit current rating are essential.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Ampere Rating:
30 A
Body/Insulating Material:
GFPC
Max Operating Temp:
80 °C
Max Storage Temp:
80 °C
Frequency (Hz):
50/60 Hz
Max Fuse Rating:
30 A
Fuse Installation Method:
Clip-in
Short Circuit Current Rating Sccr:
200 kA
Rated voltage AC UL:
600 V
Min Storage Temp:
-25 °C
Rated voltage DC UL:
600 V
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Circuit Protection
Product Type:
Fuse Base
Product Material:
Tin-Plated Copper
Voltage Rating:
600V
Amperage Rating:
30A
Listing:
UL Listed
Standards:
CSA
Product Subgroup:
Fuse Holders & Blocks

Mersen 60300J – Frequently Asked Questions

1) Will the Mersen 60300J fuse base accept any Class J fuse, or only up to 30 amps?
Only up to 30A. The 60300J is sized for Class J fuses with a maximum fuse rating of 30 A at 600V AC and 600V DC. Class J fuse dimensions change with ampere range, so a 60A or 100A Class J fuse will not seat in these clips. Step up to the next frame size in the Mersen Class J base family for higher amperages.
2) What pole configurations does the Mersen 60300J Class J fuse base come in?
Three choices: a Standard version ordered as 60300J, a 2-pole version as 60307SJ, and a 3-pole version as 60328SJ. Pick the pole count to match the circuit, single phase two-pole or three phase three-pole, and the space in the panel or enclosure.
3) Can I use this Mersen fuse base in a panel with high available fault current?
Yes. The 60300J Class J base carries a 200 kA short circuit current rating, which covers service-entrance and motor control center locations where available fault current is high. It is UL Listed and CSA certified to UL4248 (formerly UL512) for fuseholders.
4) What wire can I land on the Mersen 60300J fuse base terminals?
The box-style connectors take stranded or solid conductors in either copper or aluminum, so the same base works on an aluminum feeder or a copper branch run without an adapter lug.
5) Is this fuse base suitable for a hot mechanical room or an unheated outdoor enclosure?
The 60300J is rated for operation up to 80 C, with storage from -25 C to 80 C, which covers hot switchgear rooms and cold unconditioned spaces. It is an open-style base, so in a wet or dirty location it still needs to sit inside a suitable enclosure.
6) Do Class J fuses bolt into the 60300J base or clip in?
Clip-in. The fuse snaps into tin-plated copper clips with a spring-reinforced design, so no bolts or fuse screws are involved. That makes fuse changes quick, and the reinforced clip is what keeps retention tight and resistance low on vibrating equipment like motor starters.
7) Can I use the Mersen 60300J on a DC circuit?
Yes, it is rated 600V on both AC and DC, and the AC rating also covers 50/60 Hz systems. The fuse itself still has to be rated for the DC application you are protecting.
8) What is the body of the Mersen 60300J fuse base made of, and how much isolation does it give?
Molded glass-filled polycarbonate (GFPC), with dielectric strength in excess of 2500V. Glass fill keeps the body dimensionally stable at the 80 C upper operating temperature, which matters for a base that holds clip tension on the fuse.
9) Can I standardize our plants on one fuse base part number across US and Canadian sites?
Yes. The Mersen 60300J family is both UL Listed (Guide IZLT, File E52283) and CSA Certified (Class 6225, File 32169), so the same base number is acceptable on either side of the border. Country of origin is Mexico, which procurement teams usually need for documentation.
How fast can I get the Mersen 60300J 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 60300J come with a warranty?
Absolutely. The Mersen 60300J 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 60300J?
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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