Help to identify capacitor please

Markt

unread,

Apr 11, 2011, 7:21:21 AM4/11/11

to

Please can anyone help me to identify a capacitor.

It is fitted to an MK Sentry RCD socket, it is fitted in position C6 and
is used as the mains dropper to power the RCD circuitry.

It's only markings are 334K250 on the top line and NIS~S82 on the bottom
line.

The socket has an active RCD and the Reset button will not hold in. I
think that not enough voltage is being applied to the circuit, because
if I apply 18V dc to the circuit it will latch the solenoid, but out of
the mains derived supply I am only getting about 10V.

TIA

Mark

--
Markt

N_Cook

unread,

Apr 11, 2011, 10:19:22 AM4/11/11

to

Markt <Markt....@diybanter.com> wrote in message
news:Markt....@diybanter.com...

33* 10^4 pico farad, 250V but would have to be self-healing type, not
polyester

boardjunkie1

unread,

Apr 11, 2011, 10:43:17 AM4/11/11

to

.33uF 250v

Phil Allison

unread,

Apr 11, 2011, 7:26:05 PM4/11/11

to

"Markt"

> Please can anyone help me to identify a capacitor.
>
> It is fitted to an MK Sentry RCD socket, it is fitted in position C6 and
> is used as the mains dropper to power the RCD circuitry.
>
> It's only markings are 334K250 on the top line and NIS~S82 on the bottom
> line.
>

** Its a 330 nF cap rated at 250 volts DC - a very poor choice by the maker.

..... Phil

Phil Allison

unread,

Apr 11, 2011, 7:53:06 PM4/11/11

to

"Nutcase Kook"

>
> 33* 10^4 pico farad, 250V but would have to be self-healing type, not
> polyester

** Really ?

So polyester caps are not " self healing " ??

.... Phil

Markt

unread,

Apr 12, 2011, 3:12:51 PM4/12/11

to

'Phil Allison[_2_ Wrote:
> ;2626915']"Markt"-

> Please can anyone help me to identify a capacitor.
>
> It is fitted to an MK Sentry RCD socket, it is fitted in position C6
> and
> is used as the mains dropper to power the RCD circuitry.
>
> It's only markings are 334K250 on the top line and NIS~S82 on the
> bottom
> line.

> -

>
> ** Its a 330 nF cap rated at 250 volts DC - a very poor choice by the
> maker.
>
>

> ...... Phil

Thanks Phil

I take it that you mean the working voltage is to low, what voltage
would be appropriate?

Mark

--
Markt

Phil Allison

unread,

Apr 12, 2011, 8:01:00 PM4/12/11

to

"Markt"
>
> 'Phil Allison:

>>
>> ** Its a 330 nF cap rated at 250 volts DC - a very poor choice by the
>> maker.
>

> I take it that you mean the working voltage is to low, what voltage
> would be appropriate?

** Film caps rated for continuous use across the AC supply are special
types - known as class X1 or class X2

They are AC voltage rated, usually at 150 or 275 volts and carry logos from
agencies like UL.

..... Phil

Markt

unread,

Apr 13, 2011, 4:22:42 AM4/13/11

to

'Phil Allison[_2_ Wrote:
> ;2627576']"Markt"-
>
> 'Phil Allison:-

>
> ** Its a 330 nF cap rated at 250 volts DC - a very poor choice by the

> maker.-

>
> I take it that you mean the working voltage is to low, what voltage

> would be appropriate?-

>
>
> ** Film caps rated for continuous use across the AC supply are special
> types - known as class X1 or class X2
>
> They are AC voltage rated, usually at 150 or 275 volts and carry logos
> from
> agencies like UL.
>
>

> ...... Phil

Thanks again Phil

I have seen X1 & X2 caps in the R.S. and Farnell books thanks for the
advice.

Mark

--
Markt