Author Topic: EMI suppression capacitor question  (Read 700 times)

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Offline SnipTheCat

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EMI suppression capacitor question
« on: July 10, 2017, 05:44:51 pm »
Hi,

   I'm wondering, if EMI suppression capacitors generally found in SMPS power supply (the yellow block MET capacitor just after the fuse), let's say 0.33µF / 275V AC, could be replaced by a 0.33µF MKPH rated "630V AC / 1200V DC / 50Khz" (black block found in induction cookers)? The latter is much bigger of course, but would it do the job and be an acceptable substitute?

David.
 

Offline Neilm

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Re: EMI suppression capacitor question
« Reply #1 on: July 10, 2017, 07:04:59 pm »
EMI capacitors have special ratings. These are X / Y ratings depending on how they are to be used. It means that they are designed to fail safely and not short circuit. It is not likely the capacitor you have mentioned is correctly rated.

Why do you want to replace the capacitor?
Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe. - Albert Einstein
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Offline SnipTheCat

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Re: EMI suppression capacitor question
« Reply #2 on: July 12, 2017, 05:47:10 pm »
Hi,

 The question was purely for information, but I do have a bunch of those 630VAC/1200VDC 0.33µF capacitors around, while i have a burnt MET 033uF/275VAC capacitor burnt and none on hand. Been looking for a while online, couldn't fine any thing relevant?
« Last Edit: July 12, 2017, 06:35:14 pm by SnipTheCat »
 


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