What is ripple current rating of this film capacitor?

[Flyback]

Hi,
What is the ripple current rating of this film capacitor? (at 50/60 Hz and 20kHz)

MAB MKP 12/400 12UF +-5% 400V AC 30000h.....

Pardon Our Interruption...

Here is its "datasheet"

https://www.rgbautomatyka.pl/media/docs/en/96/12UF%20MAB%20MKP%2012-400%20SIEMENS%20-%20product%20information.pdf

Attached also is datasheet...none tell the ripple current.
(it doesnt weigh 1Kg)

Attached also is datasheet...none tell the ripple current

 

[rjenkinsgb]

Film capacitors don't have a ripple current rating as such; the limit is a dV/dT figure, usually volts per microsecond.

You can calculate the equivalent current in a specific application from that, the capacitor value and the signal frequency or sum of the frequency components.

For example, a present series of similar motor run style MKP have ratings around 15 - 20V per uS.

>google<
I've just found a vintage Siemens data book; see page 393 - the MKP motor caps in that are rated 10V/uS.

http://www.bitsavers.org/components/siemens/1984_Siemens_Capacitor_RFI_PTC_NTC.pdf

ps. Similar MKP motor caps, brand new, cost a lot less than that ebay one!

 

[Flyback]

Film capacitors don't have a ripple current rating as such; the limit is a dV/dT figure, usually volts per microsecond.

Thanks, it'll be used in this converter attached, in LTspice
Its 30Arms of ripple current, at 20khz, but the highest V/us is about 3v/us, so it will be OK?
I thought the equivalent ripple current was VAC/Xc = 400/Xc

Xc for 12uF at 50Hz

...gives 1.5A.....so thats well below 30A, and i would have thought bad news for us?