Electronics > Projects, Designs, and Technical Stuff
How many uF this axial capacitor?
sdancer75:
--- Quote from: Gyro on December 13, 2019, 09:48:28 am ---No, that is a DC rating and the original is AC rated. The peak voltage of a 250V RMS AC sine wave is nearly 360V. You need to replace with at least 400V DC rating.
--- End quote ---
Maybe it's sound a stupid question, but how did you understand that Metallized Polypropylene Film capacitor above is DC rating. From the marking, I can only decode the capacity and the voltage rating. It does not say if is AC or DC.
A 400V Metallized Polypropylene Film will be a good replacement part for the original axial metalized polypropylene?
mjkuwp:
The part has "250 V~" printed on it and the assumption is that "~" is a sine wave. This is what suggests 250 V AC rating.
Gyro:
Yes, if not explicitly indicated, assume that it is a DC rating - it is almost universally true.
The 250V~ marking is one of those exceptions, it normally applies to things like induction motor run capacitors, again where it will be very clearly indicated.
sdancer75:
--- Quote from: mjkuwp on December 23, 2019, 12:19:40 pm ---The part has "250 V~" printed on it and the assumption is that "~" is a sine wave. This is what suggests 250 V AC rating.
--- End quote ---
Thank you for your answer but I meant the other part that has no indication at all but it clarified from Gyro !!
gbaddeley:
Agree with Gyro. Replacement needs to be 250VAC rated, 1.7uF. Preferably MKP for its self healing properties. A VDC rated cap could be used, but I would go over 400V for extra margin of safety, say 630V. You don’t want it to blow if there is an AC mains surge.
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