Mersen 60308SJ Class J Fuse Base, 600V 30A 3-Pole, Tin-Plate Aluminum
The Mersen 60308SJ is a 3-pole Class J fuse base rated 600V and 30A, built with a tin-plate aluminum box and a reinforced clip for secure fuse retention. Designed for Class J fuse protection in panelboards, switchboards, and industrial control equipment, this fuse base is UL listed and CSA certified, meeting the requirements of UL4248 (formerly UL512) for dependable, code-compliant overcurrent protection.
Key Features
- Ampere Rating: 30A rated, with a maximum fuse rating of 30A for Class J fuses.
- Voltage Rating: 600V AC and 600V DC (UL) for a broad range of distribution applications.
- 3-Pole Configuration: Supports three-phase circuit protection in a single compact base.
- Durable Construction: Tin-plate aluminum box with a reinforced clip for a secure, long-lasting fuse connection.
- Body Insulating Material: GFPC insulating material for reliable electrical isolation.
- Flexible Installation: Screw mount or DIN rail mounting with clip-in fuse installation.
- Short Circuit Current Rating: 200 kA SCCR for high fault-current environments.
- Operating Range: Rated for 50/60 Hz service with an operating and storage temperature range of -25 °C to 80 °C.
Certifications & Compliance
- UL Listed, Guide IZLT, File E52283
- CSA Certified, Class 6225, File 32169
- Meets the requirements of UL4248 (formerly UL512) for Class J fuse blocks
Technical Specifications
- Ampere Rating: 30 A
- Body Insulating Material: GFPC
- Country Of Origin: MX
- Frequency Hz: 50/60 Hz
- Fuse Installation Method: Clip-in
- Installation Mounting: Screw Mount or DIN Rail
- Max Fuse Rating: 30 A
- Max Operating Temp: 80 °C
- Max Storage Temp: 80 °C
- Min Storage Temp: -25 °C
- Product Line: 6SJ - Class J
- Rated Voltage Ac Ul: 600 V
- Rated Voltage Dc Ul: 600 V
- Short Circuit Current Rating Sccr: 200 kA
- Torque Rating: 35 lb-in
Typical Applications
- Class J Fuse Protection in Panelboards and Switchboards
- Three-Phase Circuit Protection in Industrial Control Panels
- Motor Control Centers and Power Distribution Equipment
- OEM Electrical Equipment Requiring High SCCR Ratings
- Commercial and Industrial Electrical Installations
Why Mersen?
Mersen's 60308SJ fuse base combines a tin-plate aluminum box and reinforced clip with UL listing and CSA certification, delivering a dependable connection point for Class J fuses in demanding electrical systems. With a 200 kA short circuit current rating and compliance with UL4248, the 60308SJ is engineered for code-compliant performance in professional electrical and industrial applications.
Manufacturer Resources
Spec Sheet
Product Specs
- Product Type:
- Fuse Base
- Product Material:
- Tin-Plate Aluminum
- Voltage Rating:
- 600V
- Amperage Rating:
- 30A
- Configuration:
- 3-Pole
- Listing:
- UL Listed
- Series:
- 6SJ - Class J
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Fuse Holders & Blocks
- Number Of Poles:
- Three-pole
Mersen 60308SJ – Frequently Asked Questions
1) Will the Mersen 60308SJ fuse base accept any Class J fuse up to 30 amps?
The 60308SJ is sized for Class J fuses rated 30A maximum at 600V. Class J fuses are dimensionally distinct from Class R or Class T, so only a 30A Class J fuse will clip into this base. If your circuit needs 60A or 100A Class J protection, you need the next case size up in the 6SJ family, not this base.
2) Can I mount a Mersen 60308SJ Class J fuse base on DIN rail, or does it have to be screwed down?
Both. The 60308SJ mounts on DIN rail or by screws to a panel, so it drops into an existing control panel subplate or a rail run without a separate adapter. Fuses install clip-in.
3) Is the Mersen 60308SJ rated for a 200 kA short circuit panel?
Yes. The 60308SJ carries a 200 kA short circuit current rating, which is what lets an OEM declare a high SCCR on a control panel when paired with current-limiting Class J fuses. It is rated 600V AC and 600V DC per UL, at 50/60 Hz.
4) Is this Mersen Class J fuse base UL listed for a code inspection?
The 60308SJ is UL Listed under Guide IZLT, File E52283, and CSA Certified under Class 6225, File 32169. It meets UL4248 (formerly UL512) for Class J fuse blocks, which is the standard an inspector will be looking for on a fuse block in a panelboard or switchboard.
5) Will one Mersen 60308SJ cover all three phases, or do I need three separate bases?
One unit covers all three. The 60308SJ is a 3-pole base, so a single part protects a three-phase 600V branch at up to 30A. For a single-phase or control circuit you would want the 1-pole or 2-pole version of the 6SJ series instead.
6) What torque should I use on the terminals of the Mersen 60308SJ fuse base?
Terminal torque is 35 lb-in. Under-torquing a Class J base is a common cause of hot joints in motor control centers, so set the driver rather than guessing, and re-check after the first heat cycle.
7) Can the Mersen 60308SJ fuse base handle a hot industrial enclosure?
Operating and storage range is -25 C to 80 C, which covers most unconditioned industrial enclosures and outdoor cabinets. Note that is the base's limit, not a derating curve for the fuse itself, so size the fuse for the enclosure temperature as the fuse data requires.
8) What is the Mersen 60308SJ fuse base made of and will it hold a fuse tight over time?
The box is tin-plate aluminum with a reinforced clip for fuse retention, and the body insulation is GFPC. Tin plating on the current-carrying path is what keeps the clip-to-ferrule connection from degrading in a panel that cycles hot and cold.
9) Where is the Mersen 60308SJ made, and what part number do I order?
Order it as Mersen 60308SJ, part of the 6SJ Class J line. Country of origin is Mexico, which matters if you are filling out trade or domestic-preference paperwork on a government or institutional job.
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Absolutely. The Mersen 60308SJ is backed by a manufacturer’s warranty.
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