ᐅ Looking for: electronically controlled double-pole / two-way switch

This seems quite obvious to me, but I can't find one: I want to add an extra switch to a conventional wired lighting installation (that is, switch-to-light or switch-to-switch-to-light; no push buttons), but I want to control this additional switch electronically via a contact, not manually with a rocker switch. And if this electronic switch fails, the rest of the (conventional) system should still work as usual. Does such a switch exist?

This should be achievable with a (bistable) impulse relay.

karl.jonas schrieb:

(so switch-light or switch-switch-light; no push buttons) install an additional switch that I can control electronically via a contact instead of manually with a rocker. And if this electronic switch ever fails, the (conventional) part should still work. Does such a switch exist?

I don’t think I fully understand the task.
How should the light normally be controlled? By the switches, electronically, or both at the same time?
In a two-way switching setup, that’s not so simple.
Another question is why it is planned to be fail-safe. The most cost-effective solution might be to keep an identical spare switch ready that can be quickly and easily replaced in the rare event of a failure.

pkiensch schrieb:

This should be possible with a (bistable) impulse relay.

I don’t see how that would work. But maybe I’m missing something.

Thank you both for your responses. @PhiIipp, my thought process is that I actually like traditional wiring setups (they are easy to understand and have been reliable for many years), but at the same time, I want to enable smart home functionality, at least to some extent. The idea is to install a traditional setup—for example, in the hallway: a three-way switch system with three switches controlling the hallway lighting—and prepare the installation so that a fourth electronically controlled three-way switch could be integrated into a flush-mounted box later. This approach would give me flexibility and combine both worlds cost-effectively.

The suggestion from @pkiensch seems appropriate. Although I had to search quite a bit to find something somewhat clear, the eltako ESR61M-UC appears to be capable of this. In my initially traditional installation, I would need to allocate space in a flush-mounted box and run a switched conductor for the impulse current there.
This switched conductor would then go from the eltako device to wherever the “intelligence” is located, probably a microcontroller connected via Ethernet.

1. Was this understandable?
2. Could this make sense (I know many alternatives are discussed here)?
Or would it be obviously better for professionals to plan the entire installation with push-buttons and impulse relays from the start?

One final note/question: I’m a big fan of the Berker 1930 switches. Is there anything like push-buttons or impulse relays available in that style?

PhiIipp schrieb:

I don’t see how that should work. But maybe I’m just missing something.

My idea was to create a two-way switch circuit using a standard switch and a relay. Of course, this assumes that if the relay fails, it still switches one of the outputs.

karl.jonas schrieb:

My conceptual scenario is that I actually like "classic" wiring (it's understandable and has worked reliably for many years), but at the same time I'd like to at least enable "Smart Home" functionality.

So why not simply install a few Shelly devices?