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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Description Datasheet Availability Pricing (NOK) Filter the results in the table by unit price based on your quantity.
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 3/6/2026
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 3/9/2026
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 2/27/2026
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 2/27/2026
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