Hi!
Are you aware of any DIN rail (“Hutschiene”) Zigbee relays that are supported by deconz?
Thanks so much for your feedback (English or German)! 
Moved to #advice
You have the brand “Legrand” in Germany ?
I assume that that I could order items from Legrand, but I could not find a zigbee relay for the DIN rail. What have I missed? Thanks for your help!
They have a gamme called drivia, only rail din devices, there is a relay, a teleruptor, power measurement, ect …
You have the french version here Découvrez Drivia with Netatmo, le premier tableau électrique connecté de Legrand - Espace Pro | Legrand
https://www.ubisys.de/produkte/produkte-licht-verbraucher/produkte-licht-verbraucher-s1-r/
I have a few Ubisys devices running and they work usually without problems. OTA update is possible too. The only drawback is the price tag 
Hi!
More than a year later I still have not found a ZigBee device for the DIN rail that is compatible with deconz. 
I was not able to find the linked device from Legrand to buy in Germany.
Has anybody of you found something that works and is available?
Add DDF for Tuya / TONGOU TO-Q-SV1-ZT by BabaIsYou · Pull Request #6842 · dresden-elektronik/deconz-rest-plugin · GitHub ?
There is also a version with metering not implemented for now, but may be not so difficult with DDF.
I was not able to find the linked device from Legrand to buy in Germany.
For exemple
There is too a DIN realy on Casa.ia and perhaps 3/4 on tuya clones.
Just type the word you are searching on google.
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Erm, thank you, but I do not want or need Netatmo. Maybe I misunderstood something about it, though. The simpler it is, the better, so a plain ZigBee/deconz-compatible DIN rail device without any ado would be great.
Have you seen the link I gave earlier to already supported Tongou device ?
May be it’s not what you are searching for ? Have a look at Products - TONGOU Electrical
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Thank you both for the links, I will (again) look into and sorry in case I misunderstood you.
@Mimiix and other experts:
Are these DIN rail interrupters meant as replacement of the classic interrupters (called “FI-Schalter” or “Sicherung” in German, I believe), or should they be used in addition? If the latter, should they be placed before or after the classic interrupter?
I have no idea. Best to ask a electrician of your area.
However, If you want to use them as safety devices, i strongly to purchase a good brand.
Well, I already have all the safety interrupters installed but am not sure if I want to remotely switch a (garden) device (which even has its own “FI-Schalter”), where the “intelligent” ZigBee interrupter should be looped in. But your advice to ask an electrician is good, of course; even better to have it installed by one.
Im using Ubisys DINrail with Deconz. These work out of the box.
They are also sold as BEGA rebrands.
They are not intended to replace the FI - place them behind as a power switch.
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@jensflorian
Thank you so much, this looks very promising! 
The S2-R can provide 2 devices, with 500VA max. each, whereas the S1-R is for one device with 3680VA max. (16A @230V).
I plan to control my garden pump (1050W), so it seems I need the S1-R.
The S2 (500 W) was too weak for my garden pump, and the S1 is either not available or very expensive (>175 €).
Now I’m back to zero and still searching…
I could not find something from Legrand that I could order in Germany, and I’m not willing to buy via A’Express.
Is the “LUPUSEC - DIN2”* compatible with deCONZ?
Any other advice?
But my previous link was for germany ?
My bad, of course!