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When i lost power (electricity) the switch is no more ON.
Can i receive an alarm?

When you lost power, you can´t receive anything (if the PL also lost power).

Due a switch is an output, you can´t get an alarm from a normal switch* (there´s normally no feedback from the plug assembly)

* If you have a PAB switch board and newest firmware, it should be possible to check the current value and generate an alarm if it´s too low or too hight (paper description, I haven´t one)

When i lost power (electricity) the switch is no more ON.

I forgot to say: That´s not true. The switch is still on (if PL has power) but there is no power to go through.
If you switch on your kitchen light and then you remove the fuse for that light, the switch is still on, but the light is off.