Skip to main content

All locations

Please select your country & language

China | 中国
Germany | Deutschland

Your country is not in the list?

Go to our international website:

Mersen EP International website
Country / Language:  USA / English
Contact us

Approvals & Standards

  • All class J fuse blocks meet the requirements of UL4248 (formerly UL512)
  • UL listed Guide IZLT, File E52283
  • CSA certified class 6225, File 32169

Key features & benefits

Mersen open style class J fuse blocks accommodate all class J fuses ranging from 0-600A, 600V. A choice of screw, pressure plate, box and special order stud connectors fit a wide range of stranded or solid copper or aluminum wire. Insulators are either molded glass-filled polycarbonate (GFPC) or phenolic with verified dielectric strength in excess of 2500V. SJ fuse blocks are more compact than the traditional offering and feature a unique adder block configuration for multi-pole field assembly. All fuse clips are made of high conductivity tin-plated copper, with a choice of spring reinforced or non-spring reinforced clips.

More specifications


Recommended fuse usage

  • Class J Blocks (600V) use with AJT, A4J, HSJ
  • Volts: 600VAC/DC
  • Amps: 30A, 60A, 100A; 200A, 400A, 600A
  • SCCR: 200kA

Product Specifications

Item Number



Fuse Block 600VAC 600VDC Class J 30A 3-Pole Box with Reinforced Clip  



Rated voltage AC UL

600   V

Rated voltage DC UL

600   V

Ampere Rating

30   A

ROHS Compliant


Fuse Class

Class J  

Short Circuit Current Rating (SCCR)


Fuse Type/Class

Class J  

Number of Poles


Fuse Installation Method


Body/Insulating Material


Max Fuse Rating

30   A

Installation Mounting

Screw Mount or DIN Rail  

Product Weight

0.8   lb

Product Width

3.62   in

Product Length

3.9   in

Product Height

2.2   in

Sell Pack Quantity

5   Each

Sell Pack Weight

4.2   lb

Sell Pack Width

6.12   in

Sell Pack Length

6.13   in

Sell Pack Height

7.75   in