Safety Capacitors; Is it OK to fit an X1 in place of an X2?

Question

I have a PCB which has a 0.010uF X2 safety capacitor fitted. It seems the exact part is now obsolete.

Would it be acceptable to replace this part with a 0.010uF X1 safety capacitor?

I believe a capacitors subclass is decided according to its peak/rated and impulse voltages. With an X1s ratings surpassing those of the of X2 and X3.

I know I could probably find another 0.010uF X2 to replace it.

I also know I have not provided much information about the overall application. Which is because it's ancient and I have limited supporting documentation (typically).

Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. — Community, Sep 17 '21 at 08:25

313Ctron · Answer 1 · 2021-09-17T12:41:29.673

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I also found the following slide provided by KEMET. Might be useful as it references Y capacitors too...

edited Sep 17 '21 at 12:41

answered Sep 17 '21 at 09:41

313Ctron

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That KEMET slide says "VAC" over the symbol for DC. – Andrew Morton Sep 17 '21 at 11:02
@AndrewMorton Yes. The 1500 VAC should read 1500 VDC, based on the text just above it. – Russell McMahon Sep 17 '21 at 12:19
@AndrewMorton, Good spot! I'll adjust the image accordingly. – 313Ctron Sep 17 '21 at 12:37

score 1 · Accepted Answer · answered Sep 17 '21 at 08:23

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X1, X2 and X3 voltage ratings: -

Picture from here. Same info; different source: -

Image from here.

Would it be acceptable to replace this part with a 0.010uF X1 safety capacitor?

Regarding voltage ratings, X1 has better specifications.

answered Sep 17 '21 at 08:23

Andy aka

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Thanks for your confirmation Andy, much appreciated. – 313Ctron Sep 17 '21 at 09:23

Safety Capacitors; Is it OK to fit an X1 in place of an X2?

2 Answers2