Capacitor Identification

[Greenacre]

Hi, I am trying to find some ware I can buy this capacitor in the pics attached. I normally get parts from RS online but cant seem to to find this one listed.

Many thanks in advance.

[petehall347]

Re: Capacitor Identification

looks like an x2 rated safety cap to me .
https://uk.rs-online.com/web/c/passi...CH_ALL_DEFAULT

[Greenacre]

Re: Capacitor Identification

The only ones I can see would be a higher Voltage and I cant identify the nf for this. Do you know a suitable alternative to the exact cap?

[Greenacre]

Re: Capacitor Identification

I was thinking of one of these as a replacement though I cannot work out what the nf should be for the original.

https://uk.rs-online.com/web/p/film-capacitors/0210500

https://uk.rs-online.com/web/p/film-capacitors/0210487

[redwire]

Re: Capacitor Identification

The capacitor is a metallized paper cap Rifa PME285 series, 2.2nF or 2,200pF X2 safety rated 275VAC.
Don't replace with Rifa PME271's they are notorious for cracking and shorting out, they burn up.
The industry is instead using ceramic disc capacitors (Y2) there.

[andrewsawesomr]

Re: Capacitor Identification

An example of one of the capacitors redwire mentioned is https://uk.rs-online.com/web/p/singl...citors/8523390

[Greenacre]

Re: Capacitor Identification

Thank you all for your knowledge and help, I will order one up.

[Greenacre]

Re: Capacitor Identification

Morning All, andrewsawesomr thank you for the link. That cap is unfortunately out of stock until mid September. I have checked and there is another that matches all categories except the series instead of VY2 its AY2. I wonder if this would be a acceptable equivalent. The use for this is a Power supply in a VHS player. Please see the link below.

https://uk.rs-online.com/web/p/singl...citors/8274577

Again many thanks in advance.

[stj]

Re: Capacitor Identification

it must be X2 rated, NOT Y2

[redwire]

Re: Capacitor Identification

That Vishay AY2 part is rated X1/Y2. I thought you can use a Y2 cap as an X1, many parts have both approvals.

[Greenacre]

Re: Capacitor Identification

So would it need to be a X2/Y2? I know the original part in my pic is X2 for domestic use in the uk and X1 is industrial. not sure why its not interchangeable.

[redwire]

Re: Capacitor Identification

Because a Y-cap failure can cause electric shock, they are tested to higher voltages that are 2X that of an X-cap in the same class number.
A Y2 is tested to 5kV, an X2 to 2.5kV. So you need an X2 cap but a Y2 will work fine despite its higher voltage and larger size.
X1 is a higher voltage-proof test than X2, so an X1 is above an X2.
Y1 is a higher voltage-proof test than Y2, so an Y1 is above an Y2.

OP your cap is likely just for RFI/EMI filtering like in a sewing machine or SMPS.

[stj]

Re: Capacitor Identification

X & Y have different worst-case failure modes.

[redwire]

Re: Capacitor Identification

I think it's only dielectric strength that is the difference? Higher test voltages for Y-caps.
Parts of IEC60384-14 the endurance test is 1,000hrs at high temp and voltage 1.25x rated for X2 and X1, and 1.7x for Y2.
There is no flammability test performed on Y-caps. I don't have a copy of the standard.