New polypropylene capacitors damaged?

[Rickpercy87]

I've bought some polypropylene capacitors from eBay. They are 4.7uf rated for 400v.  They are Chinese so I didn't pay an awful lot.

The dipped case looks peculiar.  Some of them have very slightly sharp edges in the case and you can make out bare metal where is has not been covered properly.

Could this be dangerous?

Thanks



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[T3sl4co1l]

Answer is same as always... what were you expecting...

I'd be curious if a hi-pot shows them even handling the rated voltage without breakdown.

Are they at least a reasonable size (maybe 32mm long, 13mm wide)?

Tim

[station240]

I've bought some polypropylene capacitors from eBay. They are 4.7uf rated for 400v.  They are Chinese so I didn't pay an awful lot.

The dipped case looks peculiar.  Some of them have very slightly sharp edges in the case and you can make out bare metal where is has not been covered properly.

Could this be dangerous?

Danger is relative, what voltage are you actually applying ?
If the polypropylene sticks out further than the foil, it should be too much of an issue.

Pictures would help, but sounds like they didn't pour enough epoxy on the ends to seal it.
Pick the worst one and send it to Photonic Induction, or some other local nut ball with a huge variac.

ps: You might want to disable Tapatalk's eWank feature.

[Rickpercy87]

Cheers for the reply, I will be using them with 230v AC led bulbs using the reactance to step down the voltage.  I've not calculated the exact current I'll get but it will be around 200mA I suppose.

I'll get some pictures later, would the metal be the conductive plates of the capacitor? If it is won't it arc? Also is could potentially short.

I'll probably end up applying power to it and poking it with my multimeter

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[wraper]

Cheers for the reply, I will be using them with 230v AC led bulbs using the reactance to step down the voltage.  I've not calculated the exact current I'll get but it will be around 200mA I suppose.

First of all, sooner or later 400V capacitors will fail if you use them at 230V AC.
Secondly, what you are going to do, don't sound to be smart. The result might be not what you expect.

[Seekonk]

Metal, those were the days.  You have a flash metalization of the insulator which is self healing. A short would likely clear itself with enough power.