[chbot] Matthias Wandel, and his amazing exploding SSR

[Trevor Wignall]

It was a long time ago but I seem to recall a minimum creepage distance
requirement of 8mm between live circuits (phase or neutral included) and
circuits that should be safe. This would include track to track separation
on a PCB. For optocouplers on a PCB, routing a slot in the PCB between the
two rows of pins is not uncommon.
Trevor


On Thu, Aug 23, 2018 at 10:14 PM Richard Jones <richard.jones.1952 at gmail.com>
wrote:

> I'm planning some 10A resistive load switching based around moc3043 and
> bta41 along the lines published by open energy monitor. I'll let you know
> how I get on when the parts arrive. For PCB layout I'll be looking for 6mm
> separation between mains and low voltage side, re-enforcing the current
> carrying tracks with 1mm2 copper wire, and treating the low voltage side as
> live for good measure.
>
> Richard
>
> On Thu, 23 Aug 2018 10:59 Volker Kuhlmann, <list0570 at paradise.net.nz>
> wrote:
>
>> On Thu 23 Aug 2018 06:33:39 NZST +1200, Mark Atherton wrote:
>>
>> > https://www.youtube.com/watch?v=FV9t1GFVbhU
>> >
>> > What happens when you try and control a 22A electric water heater
>> > (presumably 120+120V in Canada) using a cheap 25A solid state relay.
>>
>> Oops, thanks for posting that. I had similar plans, although with a bit
>> more protection. I have 2 100A versions here... but got them from
>> Aliexpress, so they must be good, right...? US$18/2.
>>
>> Digikey has Omron G3NA series for around US$100+, and they require a
>> massive heat sink.
>>
>> The bipolar load switching creates a significant voltage drop. Another
>> list member reported that the SSR got only lukewarm without heat sink
>> when operated at 10A for the 40A version. Does anyone else have
>> experience with this, and with which SSR model?
>>
>> The guy who took one apart is wrong on his electrical safety assessment
>> though, there ain't 4mm clearance on that PCB...
>>
>> 25-40W power loss, big heat sink, 20mA permanent leakage (that's more
>> than an old wirewound transformer), me thinks a mechanical relay might
>> be better...
>>
>> Volker
>>
>> --
>> Volker Kuhlmann
>> http://volker.top.geek.nz/      Please do not CC list postings to me.
>>
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