Class X, class Y capacitors

[dr pepper]

I'm familiar with class x and y so called safety caps.
I just heard that there is another rating that replaces both of these, is this true, how can one cap replace one that fails open and another that fails short?

 

[Pommie]

Interested to hear an answer.

Mike.

 

[ronsimpson]

I think we are looking for capacitors that will fail with out starting a fire.

 

[atferrari]

Maybe what is new is the standard...

 

[KeepItSimpleStupid]

https://www.illinoiscapacitor.com/pdf/Papers/EMI_RFI_suppression_capacitors.pdf

 

[Flyback]

class y caps dont fail short...very few things fail short.........they may burn to a short for a small interval, but the short will burn itself out and go open.........for things to fail, and stay as a short circuit, their short circuit current is usually limited by something so that they dont burn open.

 

[gophert]

how can one cap replace one that fails open and another that fails shor

it is one of those things invented by a physicist. A "meta-failure" - both open and closed at the same time.
I think they are marketed as "Schrödinger's Cap".

 

[ronsimpson]

Schrödinger's Cap

It took a while to find a picture of Schrodinger with his Cap. As a adult he was never pictured with one.

 

[gophert]

It took a while to find a picture of Schrodinger with his Cap. As a adult he was never pictured with one.

I hope I don't have to explain...?

 

[shortbus=]

I hope I don't have to explain...?

please do.

 

[gophert]

it is one of those things invented by a physicist. A "meta-failure" - both open and closed at the same time.
I think they are marketed as "Schrödinger's Cap".

I hope I don't have to explain...?

please do.

Schrodinger's Cap is a reference to "Schrodinger's Cat" thought experiment were he compares nuclear decay of a specific atom to whether a cat in a box is alive or dead - he describes the cat as simultaneously alive and dead until we look.

Schrödinger's cat - Wikipedia

en.m.wikipedia.org

Similar to the aforementioned mythical capacitor that I above, that both fails open and fails closed simultaneously.

I hope this detailed description has sucked all the humor out of my comment from above post.

 

[shortbus=]

I hope this detailed description has sucked all the humor out of my comment from above post.

It's getting there can you expand further?

 

[kubeek]

As far as I know, class Y caps must not fail short, so that they don´t endanger human lives. Class X must not fail in such way that they cause a fire. This does not mean they have to fail shorted.

 

[dr pepper]

Yes I think your correct kubeek.
So if one fails short and the other open I dont see how one cap can replace both.

 

[kubeek]

So if one fails short and the other open I dont see how one cap can replace both.

Which one fails short?

 

[gophert]

Which one fails short?

let me google that for us.... and the answer is, obviously,...
Neither. The two cap classes are certified for two different purposes, according to KEMET.

**broken link removed**