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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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UL Class J Time-Delay Fuses for Tight Spaces




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" | 2 | 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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/500V DC | 100,000 A @ 500 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


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 |