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Sign In Register Forgot User ID? Forgot Password?UL Class J Fuses
268 products
UL Class J fuses have a high interrupting rating for protecting against short circuits and are ideal for IEC motor starter applications. These 600VAC fuses are not interchangeable with any other UL fuse class. They are current-limiting to prevent electrical damage by disconnecting circuits before they're exposed to the full magnitude and duration of an overcurrent.
Time-Delay UL Class J Fuses, Nonindicating
Time-delay, nonindicating UL Class J fuses tolerate temporary inrush currents without opening, which prevents nuisance-blowing from motor and equipment startups. Also called slow-blow Class J fuses, they open to disconnect an electrical circuit when exposed to sustained loads and short circuits. They have no indicator for identifying a blown fuse, so they're sometimes used with an indicating fuse block or cover.
Equivalent Series: AJT, JTD, LPJ
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Time-Delay UL Class J Fuses, Indicating
Time-delay, indicating UL Class J fuses tolerate temporary inrush currents without opening, which prevents nuisance-blowing from motor and equipment startups. Also called slow-blow Class J fuses, they open to disconnect an electrical circuit when exposed to sustained loads and short circuits. They have a visual indicator to make it easier to identify blown fuses for replacement.
Equivalent Series: AJT, JTD, LPJ
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Equivalent Series: AJT, JTD-ID, LPJ-I
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Fast-Acting UL Class J Fuses, Nonindicating
Fast-acting, nonindicating UL Class J fuses open within seconds of being exposed to overloads and short circuits. Also called fast-blow Class J fuses, they are highly sensitive to changes in current flow and don't tolerate temporary overload currents or power surges. They have no indicator for identifying a blown fuse, so they're sometimes used with an indicating fuse block or cover.
Equivalent Series: A4J, JKS, JLS
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Equivalent Series: DFJ, HSJ, LDFJ
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Very-Fast-Acting UL Class J Fuses, Nonindicating
Very-fast-acting, nonindicating UL Class J fuses open circuits even more quickly than fast-acting fuses when exposed to overloads and short circuits. They're commonly used to protect solid-state electronics. These very-fast-blow fuses are highly sensitive to changes in current flow and don't tolerate temporary overload currents or power surges. They have no indicator for identifying a blown fuse, so they're sometimes used with an indicating fuse block or cover.
Equivalent Series: DFJ, HSJ, LDFJ
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