What voltage is this cap?

John E. wrote in news: snipped-for-privacy@news.sf.sbcglobal.net:

That's a damn small capacitance for that size, though I agree with it, so it implies a high voltage to match what you say. I first thought of 123 as meaning 12,000 millivolts, after the convention of 104 for capacitance, but I never heard of anyone actually doing it this way, and it's definitely not

12V.

Is the writing clear? Any chance that 123 is actually something else?

It would have to withstand at least 240*1.41 =340V. I would suggest that it would be a minimum of 400V and possibly 500V.

.1 uf 1200 volt cap !

makes since to me.. most likely a snubber or bypass cap of some kind.

"John E."

** I bet it is NOT !!!

It has no polarity markings - right ?

Both ends look the same - right ?

Then it is an oil filled paper/film type.

" 2J104K " = 0.1uF, 10 % tolerance and probably the 200 volt DC rated.

....... Phil

In the UK where 240V is the norm, 400V would be the normal rating for a motor start/run cap

Take a look here:

may help.

On Sun, 03 Feb 2008 00:51:01 +0000 (GMT), Stuart put finger to keyboard and composed:

0.1uF seems much too small for a motor start/run cap. In any case, don't these caps have an AC rating rather than a DC rating?

- Franc Zabkar

Looking at manufacturer sites, 2J is a common voltage marking for 630V.

Interesting ! Any more handy tips like that ? It's a new one on me for sure.

Graham

630VDC 0.1uF

1H = 50VDC

1J = 63VDC 2A =100VDC 2D = 200VDC 2E = 250VDC 2G = 400VDC 2J = 630VDC 3A = 1,000VDC 3B = 1250VDC 3C = 1600VDC 3D = 2,000VDC 3E = 2,500VDC

01 = 190VAC

02 = 250VAC 03 = 275VAC 04 = 300VAC 05 = 400VAC 06 = 440VAC 07 = 500VAC 08 = 600VAC

On Sun, 03 Feb 2008 16:52:56 +0000, Peter Parry put finger to keyboard and composed:

2B = 125VDC 2C = 160VDC

2F = 315VDC

2H = 500VDC

The numbering doesn't always appear to be consistent:

2F = 315VDC 5B = 125VAC 5E = 250VAC

3F = 3KV DC 3G = 4KV DC 3H = 5KV DC 3I = 6KV DC

BTW, does anyone know what is meant by "POOT SIZE" and "POOT IEGTH". :-)

- Franc Zabkar

Franc Zabkar wrote in news: snipped-for-privacy@4ax.com:

Poot length? Mine tend to be of the order of 400 milliseconds.

So, how does one decisively determine the type?

There are no markings whatsoever other than the ones described. The plastic insulation (shrink) covers all but the inner diameter of the ends. The leads are connected to the (aluminum) end caps which are identical.

Can you be more specific as to the type? Maybe a reference to a Mouser or Digi-Key item?

Thanks,

Thanks so much for your assistance. Invaluable to one whose knowledge in this area is so... basic.

:In article , : "Phil Allison" wrote: : :> > Axial electrolytic ... :> :> ** I bet it is NOT !!! :> :> It has no polarity markings - right ? :> :> Both ends look the same - right ? : :The time has come, the walrus said, to talk of non-polarized :electrolytics...

Not possible to be a non-polar electrolytic because these don't usually go above

50Vdc and they are never marked with a voltage code such as 2J. It is most likely a film type with voltage a bit higher than Phil's guess. My own guess would have been 400V but since then we have more info on voltage codes and 630V looks to be the answer.

My poot length is 10", at least that's what I tell the ladies.