Electrical problem with in-line RCD

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Sailingsaves

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I was recommended to buy an in-line rcd similar to this one some time ago (I bought 2 actually):

http://cpc.farnell.com/jojo/521935/rcd-unit-in-line/dp/PL02597

I noticed the base was getting hot. The second one was getting even hotter, so I stopped using it.

Today it failed - see photos.

The fuse in the 13A plug had failed (I had a 2A fuse in there), but upon taking it apart I can see that the circuit board had over heated and the 100 ohm resistor has failed.

Any ideas what is going on? Can I just replace the resistor do you think? But why the heating issue?View attachment 50279View attachment 50278View attachment 50277View attachment 50276

Not sure how long cpc warranty is, but it is over one year old. It was connected to large paddling pool pump last summer with no problem.

Contralube 770 inside has spit and spat around the inside a bit.
 
Yes, sorry, I should have said it worked fine on the pool pump. Was then stored.

It has been used to supply power to two laptop power supplies - the ones that normally plug straight into 240V outlet and then kick down to 19V (not needed, except if dog chewed a wire I figured it was a safety step). I normally put laptops into hibernation at night, but forget to turn the rcd off. It sits there, warm all night for about 2 months, even though negligible current is being used (as far as I know)

AC 240V not my thing.

Thanks

The new one was used to power an Amp or something whilst I was tinkering with I don't know what, but I stopped using it when it got hot. It shows no signs of overheating (but that is because I stopped using it straight away)
 
Sailingsaves said:
Yes, sorry, I should have said it worked fine on the pool pump. Was then stored.

It has been used to supply power to two laptop power supplies - the ones that normally plug straight into 240V outlet and then kick down to 19V (not needed, except if dog chewed a wire I figured it was a safety step). I normally put laptops into hibernation at night, but forget to turn the rcd off. It sits there, warm all night for about 2 months, even though negligible current is being used (as far as I know)

AC 240V not my thing.

Thanks

The new one was used to power an Amp or something whilst I was tinkering with I don't know what, but I stopped using it when it got hot. It shows no signs of overheating (but that is because I stopped using it straight away)
Click to expand...

Burn mark on the PCB makes me think bad soldered joint. But if a second one going the same way more likely a design fault eg resistor too low a power rating
 
Thanks gents, will try new resistor and see how long warranty was for - cpc don't sell this exact one any longer...makes one think...
 
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