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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 Adder Pressure Plate 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

0.24   lb

Product Width

1.16   in

Product Length

3.9   in

Product Height

2.2   in

Sell Pack Quantity

10   Each

Sell Pack Width

6.5   in

Sell Pack Length

7   in

Sell Pack Height

3.5   in