I have several LED strips in different rooms. The LED strip power supplies are installed in the central electrical cabinet where the circuit breakers are installed. Can I install a mini R4 relay in front of each LED strip power supply, and connect the switches to the S-mate 2?
Yes, you can.
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maybe I would use a device that can be placed on a DIN rail and one mini4 for communication with s-mate
A good idea, if you have enough rail space.
[DIN modul ](I just found this on AliExpress: CZK447.89 | TOMZN Ewelink Single Phase WIFI Smart Energy Meter Kwh Metering Monitoring Circuit Breaker Timer Relay for Smart Home 63A https://a.aliexpress.com/_EjxLvN2)
I personally use this module and it takes up less space in a spacious cabinet than the mini4 because it can be easily folded up.