For the uninitiated, CE marking is meaningless (it allows for self-certification).
I'd like to see Big Clive do a teardown of one of those.
Solid state relays have widespread fraud. Like 60% of the ones on amazon will catch fire or fail before they hit the rated current. Trade suppliers generally don't sell them at >30 amps.
Regular relays up to 10 amps are cheap and reliable. Beyond that, they get expensive surprisingly fast, and the reliability is hit or miss. They fail in numerous ways, but the most concerning one is the plastic case melting and catching fire. The chance of failure depends on the nature of the load (capacitive or inductive loads will dramatically shorten a relays lifespan).
In my professional career, I have witnessed ~20 of the above devices failing, with melted bits or burn marks, but of that sample none has burned down a building, yet. But I'd say that was more down to luck than good design.
In general, I would trust a china-device for monitoring power, but not for switching anything more than ~10 amps (1 outlet).
The switching under load causes the contacts to get worn, then the large load causes the now-worn contacts to get hot, and the plastic supports melt and catch fire.
It's very common to use a relay to control a contactor.
I don't care. I connected my previous breaker after it.
Please learn to never use this type of phrasing when offering suggestions. Your entire exchange was needlessly patronizing and off-putting.
Maybe just something about the latter being interpreted as a question, and the former being interpreted as an order.
You should care about the quality of these devices, especially ones that provide safety.
There are some ready-made scripts for the Nordics that check the current electricity prices and use those with some basic rulesets to see if the electric heating in a house should be on or off for example.
I just use mine to turn off the ice machine at 22:00 so it doesn't run through the night :D
Where do you think the "quality" devices are made?