[Switch] fritzdect platform, Unavailable

Hi everybody,

I have a fritzdect switch running at the momentan. If I disconnect the switch from power, HA doesnt change the state from on/off to unavailable. So i’ve a question regarding the states (in general) of switches, they can be “on/off” but can it be unavailable like the lights? Where can i find the possible states ?

As far as i see, there is no other attribute of a switch which indicates if its available or not.

Thanks!