Class J Fuses | McMaster-Carr

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Fuse UL Class

Current

Voltage

Manufacturer Equivalent Fuse

Fuse Protection Type

Overall Length

Cartridge Fuse Type

Fuse Type

Blown Fuse Indicator

Fuse Current

Breakthrough Current @ Voltage

200,000 amp @ 600V AC

300,000 amp @ 600V AC

10,000 amp @ 175V DC

10,000 amp @ 200V DC

100,000 amp @ 300V DC

100,000 amp @ 400V DC

For Fuse Manufacturer Equivalent

Overall Diameter

Number of Elements

Certification

CE Marked

CSA Certified

UL Listed

For Number of Fuses

Export Control Classification Number (ECCN)

EAR99

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Compliant

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

DFARS Specialty Metals

Exempt

Rejection-Style End

Indicator Type

UL File Number

Mounting Location

Wire Connection

For Fuse Block Current

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About Fuses

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UL Class J Time-Delay Fuses for Tight Spaces

Ferrule Style

Knife-Blade Style

Ferrule Style with Blown-Fuse Indicator

Knife-Blade Style with Blown-Fuse Indicator

Also known as dual-element fuses, these fuses withstand current overload for a short time so they won't open when exposed to harmless temporary surges, such as when starting a motor. More compact than UL Class RK1 or RK5 fuses, they are suitable for tight spaces. Use with Fuse Blocks for UL Class J Fuses.

Breakthrough current, labeled on the fuse as IR, is the maximum current that a fuse can safely stop in the event of a short circuit.

Fuses with blown fuse indicator have a dot on the side that changes color when the fuse blows.

For technical drawings and 3-D models, click on a part number.

			Overall							Each
Current, A	Voltage	Breakthrough Current	Lg.	Dia.	No. of Elements	Cartridge Fuse Style	Blown Fuse Indicator	Specifications Met		1-9	10-Up
Manufacturer Equivalent: AJT, JTD, LPJ-SP
1	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	000000	000000
1 1/4	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
2	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
2 1/2	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
2 8/10	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
3	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
4	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
5	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
6	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
7	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
8	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
10	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
12	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
15	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
20	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
25	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
30	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 1/4"	13/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
35	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 3/8"	1 1/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
40	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 3/8"	1 1/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
45	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 3/8"	1 1/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
50	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 3/8"	1 1/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
60	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	2 3/8"	1 1/16"	2	Ferrule	No	UL Listed, CSA Certified	000000000	00000	00000
70	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	4 5/8"	1 1/8"	2	Knife Blade	No	UL Listed, CSA Certified	000000000	000000	00000
80	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	4 5/8"	1 1/8"	2	Knife Blade	No	UL Listed, CSA Certified	000000000	000000	00000
90	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	4 5/8"	1 1/8"	2	Knife Blade	No	UL Listed, CSA Certified	000000000	000000	00000
100	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	4 5/8"	1 1/8"	2	Knife Blade	No	UL Listed, CSA Certified	000000000	000000	00000
125	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5 3/4"	1 5/8"	2	Knife Blade	No	UL Listed, CSA Certified	000000000	000000	000000
150	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5 3/4"	1 5/8"	1	Knife Blade	No	UL Listed, CSA Certified	000000000	000000	000000
175	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5 3/4"	1 5/8"	2	Knife Blade	No	UL Listed, CSA Certified	000000000	000000	000000
200	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	5 3/4"	1 5/8"	2	Knife Blade	No	UL Listed, CSA Certified	00000000	000000	000000
250	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	7 1/8"	2 1/8"	2	Knife Blade	No	UL Listed, CSA Certified	000000000	000000	000000
400	600V AC/300V DC	100,000 A @ 300 V DC 300,000 A @ 600 V AC	7 1/8"	2 1/8"	2	Knife Blade	No	UL Listed, CSA Certified	00000000	000000	000000
Manufacturer Equivalent: AJT, JTD-ID, LPJ-SPI
8	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
9	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
10	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
12	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
15	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
17 1/2	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
20	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
25	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
30	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
35	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 3/8"	1 1/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
40	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 3/8"	1 1/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
45	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 3/8"	1 1/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
50	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 3/8"	1 1/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
60	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	2 3/8"	1 1/16"	1	Ferrule	Yes	UL Listed, CSA Certified	0000000	00000	00000
70	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	4 5/8"	1 1/16"	2	Knife Blade	Yes	UL Listed, CSA Certified	0000000	00000	00000
80	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	4 5/8"	1 1/16"	2	Knife Blade	Yes	UL Listed, CSA Certified	0000000	00000	00000
90	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	4 5/8"	1 1/16"	2	Knife Blade	Yes	UL Listed, CSA Certified	0000000	00000	00000
100	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	4 5/8"	1 1/16"	2	Knife Blade	Yes	UL Listed, CSA Certified	0000000	00000	00000
125	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	5 3/4"	1 5/8"	4	Knife Blade	Yes	UL Listed, CSA Certified	0000000	000000	000000
150	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	5 3/4"	1 5/8"	4	Knife Blade	Yes	UL Listed, CSA Certified	0000000	000000	000000
175	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	5 3/4"	1 5/8"	4	Knife Blade	Yes	UL Listed, CSA Certified	0000000	000000	000000
200	600V AC/400V DC	100,000 A @ 400 V DC 200,000 A @ 600 V AC	5 3/4"	1 5/8"	4	Knife Blade	Yes	UL Listed, CSA Certified	0000000	000000	000000

UL Class J Fast-Acting Fuses for Tight Spaces

Ferrule Style

Knife-Blade Style

These fuses open circuits quickly when surges are detected. More compact than UL Class RK1 or RK5 fuses, they are suitable for tight spaces. Use with Fuse Blocks for UL Class J Fuses.

Breakthrough current, labeled on the fuse as IR, is the maximum current that a fuse can safely stop in the event of a short circuit.

For technical drawings and 3-D models, click on a part number.

			Overall						Each
Current, A	Voltage	Breakthrough Current	Lg.	Dia.	No. of Elements	Cartridge Fuse Style	Specifications Met		1-9	10-Up
Manufacturer Equivalent: A4J, JKS, JLS
1	600V AC	200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	000000	000000
3	600V AC	200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
4	600V AC	200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
5	600V AC	200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
6	600V AC	200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
8	600V AC	200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
10	600V AC	200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
12	600V AC	200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
15	600V AC/200V DC	10,000 A @ 200 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
20	600V AC/200V DC	10,000 A @ 200 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
25	600V AC/200V DC	10,000 A @ 200 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
30	600V AC/200V DC	10,000 A @ 200 V DC 200,000 A @ 600 V AC	2 1/4"	13/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
35	600V AC	200,000 A @ 600 V AC	2 13/32"	1 1/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
40	600V AC/175V DC	10,000 A @ 175 V DC 200,000 A @ 600 V AC	2 3/8"	1 1/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
45	600V AC	200,000 A @ 600 V AC	2 13/32"	1 1/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
50	600V AC/175V DC	10,000 A @ 175 V DC 200,000 A @ 600 V AC	2 3/8"	1 1/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
60	600V AC/175V DC	10,000 A @ 175 V DC 200,000 A @ 600 V AC	2 3/8"	1 1/16"	1	Ferrule	UL Listed, CSA Certified	00000000	00000	00000
80	600V AC	200,000 A @ 600 V AC	4 5/8"	1 1/8"	1	Knife Blade	UL Listed, CSA Certified	00000000	00000	00000
100	600V AC	200,000 A @ 600 V AC	4 5/8"	1 1/8"	1	Knife Blade	UL Listed, CSA Certified	00000000	00000	00000
200	600V AC	200,000 A @ 600 V AC	5 3/4"	1 5/8"	1	Knife Blade	UL Listed, CSA Certified	0000000	000000	000000
400	600V AC	200,000 A @ 600 V AC	7 1/8"	2 1/8"	1	Knife Blade	UL Listed, CSA Certified	0000000	000000	000000

Fuse Blocks for UL Class Fuses

For 1 Fuse with Box-Lug Terminal

For 2 Fuses with Box-Lug Terminals

For 3 Fuses with Box-Lug Terminals

For technical drawings and 3-D models, click on a part number.

	For Fuse
For No. of Fuses	UL Class	Current, A	Voltage	Wire Connection Type	Specifications Met		Each
For Fuse Manufacturer Equivalent: A4J, AJT, JKS, JLS, JTD, LPJ-SP
1	J	1/2-30	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	000000
1	J	31-60	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
1	J	61-100	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	00000
1	J	101-200	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	000000
2	J	1/2-30	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
2	J	31-60	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	00000
3	J	1/2-30	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	000000
3	J	31-60	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	00000000	000000
3	J	61-100	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	000000
3	J	101-200	600V AC	Box-Lug Terminals	UL Listed, CSA Certified, CE Marked	0000000	000000

DIN-Rail Mount Fuse Blocks for UL Class J Fuses

For 1 Fuse

For 2 Fuses

For 3 Fuses

Covered terminals prevent contact with live electrical circuits.

For technical drawings and 3-D models, click on a part number.

For Fuse Manufacturer Equivalent: A4J, AJT, JKS, JLS, JTD, LPJ
For No. of Fuses	For Fuse Current, A	Voltage	Wire Connection Type	For DIN Rail Size, mm	Features	Ht.	Wd.	Dp.	Specifications Met		Each
1	1-30	600V AC	Screw Terminals	35	Covered Terminals	4.49"	1.28"	3.15"	UL Listed, CSA Certified	0000000	000000
1	1-30	600V AC	Screw Terminals	35	Covered Terminals, Blown-Fuse Indicator	4.49"	1.28"	3.15"	UL Listed, CSA Certified	0000000	00000
1	31-60	600V AC	Screw Terminals	35	Covered Terminals	4.8"	1.57"	3 1/2"	UL Listed, CSA Certified	0000000	00000
1	31-60	600V AC	Screw Terminals	35	Covered Terminals, Blown-Fuse Indicator	4.8"	1.57"	3 1/2"	UL Listed, CSA Certified	0000000	00000
2	1-30	600V AC	Screw Terminals	35	Covered Terminals	4.49"	2.56"	3.15"	UL Listed, CSA Certified	0000000	00000
2	1-30	600V AC	Screw Terminals	35	Covered Terminals, Blown-Fuse Indicator	4.49"	2.56"	3.15"	UL Listed, CSA Certified	0000000	00000
2	31-60	600V AC	Screw Terminals	35	Covered Terminals	4.8"	3.14"	3 1/2"	UL Listed, CSA Certified	0000000	00000
2	31-60	600V AC	Screw Terminals	35	Covered Terminals, Blown-Fuse Indicator	4.8"	3.14"	3 1/2"	UL Listed, CSA Certified	0000000	000000
3	1-30	600V AC	Screw Terminals	35	Covered Terminals	4.49"	3.84"	3.15"	UL Listed, CSA Certified	0000000	000000
3	1-30	600V AC	Screw Terminals	35	Covered Terminals, Blown-Fuse Indicator	4.49"	3.84"	3.15"	UL Listed, CSA Certified	0000000	000000
3	31-60	600V AC	Screw Terminals	35	Covered Terminals	4.8"	4.71"	3 1/2"	UL Listed, CSA Certified	0000000	000000
3	31-60	600V AC	Screw Terminals	35	Covered Terminals, Blown-Fuse Indicator	4.8"	4.71"	3 1/2"	UL Listed, CSA Certified	0000000	000000

DIN-Rail/Surface-Mount Fuse Blocks

For 1 Fuse

For 2 Fuses

For 3 Fuses

Fuse blocks have a universal hole pattern, so they can be mounted on either DIN-rail or directly onto surfaces.

For technical drawings and 3-D models, click on a part number.

	For Fuse
For No. of Fuses	UL Class	Current, A	Voltage	Wire Connection Type	For DIN Rail Size, mm	Specifications Met		Each
For Fuse Manufacturer Equivalent: A4J, AJT, JKS, JLS, JTD, LPJ-SP
1	J	1-30	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	000000
1	J	31-60	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
2	J	1-30	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
2	J	31-60	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
3	J	1-30	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000
3	J	31-60	600V AC/600V DC	Box-Lug Terminals	35	UL Listed, CSA Certified	0000000	00000

Fuse Block Reducers

Install reducers in fuse blocks to use small, low-amp fuses in blocks that are designed to hold large, high-amp fuses.

For Fuse
UL Class	Current, A	Voltage	For Fuse Block Current, A		Each
J	1-30	600V AC	35-60	00000000	000000
J	35-60	600V AC	65-100	00000000	00000