A4J Class J Power Fuses

Mersen A4J Class J Power Fuses provide excellent current-limiting protection to numerous applications. These fuses have unique dimensions that prevent the substitution of other fuses with lower ratings, interrupting ratings, or current-liming capability, providing additional protection against mismating. Constructed with a fiberglass body, dimensional stability is provided in harsh industrial environments, and the easy-to-read imprint label allows for quick recognition and replacement. Mersen A4J Class J Power Fuses are suitable for capacitors, load centers, switchboards, circuit breakers, feeder circuits, and panelboards.

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Qty. RoHS ECAD Model Product
Current Rating
Voltage Rating AC
Fuse Type
Voltage Rating DC
Interrupt Rating
Body Style
Mounting Style
Termination Style
Fuse Size/Group
Indicator Style
Packaging
Mersen Industrial & Electrical Fuses 600V 40A CLASS J FUSE
Datasheet
34In Stock
Min.: 1
Mult.: 1

Class J Fuses 40 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Fuses Holder Clip Class J Without Indicator Box
Mersen Industrial & Electrical Fuses 600V 10A CLASS J FUSE
Datasheet
20In Stock
Min.: 1
Mult.: 1

Class J Fuses 10 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Fuses Holder Clip Class J Without Indicator Box
Mersen Industrial & Electrical Fuses Fuse,Class J,High Speed,200kA AC/100kA AC,600VAC,300VDC,125A
Datasheet
3In Stock
Min.: 1
Mult.: 1

Class J Fuses 125 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Blade Fuses Holder Knife Blade Class J Without Indicator Box
Mersen Industrial & Electrical Fuses Fuse,Class J,High Speed,200kA AC/100kA AC,600VAC,300VDC,150A
Datasheet
2In Stock
Min.: 1
Mult.: 1

Class J Fuses 150 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Blade Fuses Holder Knife Blade Class J Without Indicator Box
Mersen Industrial & Electrical Fuses Fuse,Class J,High Speed,200kA AC/100kA AC,600VAC,300VDC,175A
Datasheet
3In Stock
Min.: 1
Mult.: 1

Class J Fuses 175 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Blade Fuses Holder Knife Blade Class J Without Indicator Box
Mersen Industrial & Electrical Fuses 600V 30A CLASS J FUSE
Datasheet
7In Stock
Min.: 1
Mult.: 1

Class J Fuses 30 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Fuses Holder Clip Class J Without Indicator Box
Mersen Industrial & Electrical Fuses Fuse,Class J,High Speed,200kA AC/100kA AC,600VAC,300VDC,50A
Datasheet
7In Stock
Min.: 1
Mult.: 1

Class J Fuses 50 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Fuses Holder Clip Class J Without Indicator Box
Mersen Industrial & Electrical Fuses 600V 60A CLASS J FUSE
Datasheet
16In Stock
Min.: 1
Mult.: 1

Class J Fuses 60 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Fuses Holder Clip Class J Without Indicator Box
Mersen Industrial & Electrical Fuses Fuse,Class J,High Speed,200kA AC/100kA AC,600VAC,300VDC,70A
Datasheet
1In Stock
Min.: 1
Mult.: 1

Class J Fuses 70 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Blade Fuses Holder Knife Blade Class J Without Indicator Box
Mersen Industrial & Electrical Fuses Fuse,Class J,High Speed,200kA AC/100kA AC,600VAC,300VDC,15A
Datasheet
2In Stock
Min.: 1
Mult.: 1

Class J Fuses 15 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Fuses Holder Clip Class J Without Indicator Box
Mersen Industrial & Electrical Fuses Fuse,Class J,High Speed,200kA AC/100kA AC,600VAC,300VDC,25A
Datasheet
20In Stock
Min.: 1
Mult.: 1

Class J Fuses 25 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Fuses Holder Clip Class J Without Indicator Box
Mersen Industrial & Electrical Fuses Fuse,Class J,High Speed,200kA AC/100kA AC,600VAC,300VDC,3A
Datasheet
10In Stock
Min.: 1
Mult.: 1

Class J Fuses 3 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Fuses Holder Clip Class J Without Indicator Box
Mersen Industrial & Electrical Fuses 600V 100A CLASS J FUSE
Datasheet
40Expected 03/03/2026
Min.: 1
Mult.: 1

Class J Fuses 100 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Blade Fuses Holder Knife Blade Class J Without Indicator Box
Mersen Industrial & Electrical Fuses 600V 20A CLASS J FUSE
Datasheet
20Expected 09/03/2026
Min.: 1
Mult.: 1

Class J Fuses 20 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Fuses Holder Clip Class J Without Indicator Box
Mersen Industrial & Electrical Fuses 600V 200A CLASS J FUSE
Datasheet
3Expected 03/03/2026
Min.: 1
Mult.: 1

Class J Fuses 200 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Blade Fuses Holder Knife Blade Class J Without Indicator Box
Mersen Industrial & Electrical Fuses Fuse,Class J,High Speed,200kA AC/100kA AC,600VAC,300VDC,80A
Datasheet
5Expected 27/02/2026
Min.: 1
Mult.: 1

Class J Fuses 80 A 600 VAC Fast Blow 300 VDC 200 kA at 600 VAC 100 kA at 300 VDC Cartridge Blade Fuses Holder Knife Blade Class J Without Indicator Box