UL Class UL Class |
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Protection Type Protection Type |
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Fuse Type Fuse Type |
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![]() | Cartridge |
Cartridge Fuse Style Cartridge Fuse Style |
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Breakthrough Current Breakthrough Current |
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Blown Fuse Indicator Blown Fuse Indicator |
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Number of Elements Number of Elements |
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UL File Number UL File Number |
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Rejection-Style End Rejection-Style End |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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About Fuses
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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 | |||||||||
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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 |