Under what general circumstances can AC fuses be directly used in DC circuits?

Power Circuit Protection
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Question: What are the general circumstances that would let me use an AC-rated fuse in a DC circuit? Are there any rules of thumb?
Answer: It’s not recommended. However, according to experience, using a 220VAC fuse in a DC environment below 100V generally causes no problems.

This operation usually doesn’t comply with regular specifications or poses certain risks. If your system is particularly vulnerable or mission-critical, you should use appropriately rated fuses.
But if there is sufficient margin, for example, when using a 220VAC-rated fuse in a DC environment below 100V, based on past practical experience, it generally won’t cause any issues.

More Littelfuse circuit protection products

Littelfuse Circuit Protection products provide stable and reliable signal transmission guarantee for all kinds of precision electronic devices by virtue of their precise adjustment relationship with capacitance, dynamic resistance, etc. in terms of high-frequency characteristics, and their performance is excellent in the industry.

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