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On 10/04/2024 11:50, Mike Scott wrote:
> Hi all. Two separate projects which will need a relay of some sort to
> run from a Pi or similar.
>
> I`m really looking for something plug-and-go rather than build-your-own
> (especially item 2 below)
>
> First is a dpdt relay to switch around 12-20 V at a couple of amps. spdt
> are easy to come by; the only dpdt ones I`ve found are on aliexpress,
> but their longevity is possibly open to question :-{
>
> Second is something to switch mains safely - a full 13A to run a 3kW
> heater. I`ve drawn a blank: best I can think of is to butcher one of
> those wireless mains switch modules, which would at least provide a good
> isolation gap :-)
>
> TIA for any ideas.
>
I built my own, and have spare PCBS. It has buffers to drive the relays
, led drivers and a built in mains power supply to run the pi as well.
Only switches 10A at 230V though. However a purely resistive load like a
3KW heater might well be OK
You can use *two* relays to do DPDT. :-)
Serious European made relays cost quite a bit.
Nearly all electronics these days comes ultimately from china.
Looking through my `usual suspects` supply list it seems that solid
state relays have overtaken big power contactors for switching high
mains current.
What I would try to do is get a board with four low power relays on it,
and use one to drive a big fuck off panel mounted *solid state relay*.
Two more do DPDT.
Won`t be cheap though...
--
ThereтАЩs a mighty big difference between good, sound reasons and reasons
that sound good.
Burton Hillis (William Vaughn, American columnist)
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