Safe to make Shelly 2.5 O1 and O2 live from PIR?

  • I have a PIR with Shelly 1 and I only use the Shelly to override the Switched-Live of the PIR so that I can remotely turn on the light that the PIR is connected to. This works okay since the shelly 1 is a dry-relay output.

    I now plan to use a Shelly 2.5 to apply similar control to 2 other PIRs - each channel of the Shelly 2.5 will control override one PIR switched-live.

    So, my question is, is it safe to do the same as I did with the Shelly 1, or will the Shelly 2.5 get damaged/upset if O1 or O2 are made live by the PIR (i.e. without them being made live by the Shelly 2.5 itself)?

    Just in case anyone is wondering... I cannot use the PIR switched-lives to feed the Shelly switch inputs (i.e. and then just connect the lights to O1 and O2) because in my setup the Shelly switch inputs will be used for existing manual wall switches which already manually override the PIR outputs.

    Any comments or suggestions welcome

  • Maybe this diagram will explain what I plan to do - the coloured lines are the extras for my two PIRs.

    Basically the Shelly is just providing an additional manual remote override to the PIR.

    My question is, will the red wires (which may become LIVE if the PIR detects movement) cause any problem being connected to O1 or O2 if the Shelly believes the lamp should be off?

    Any comments appreciated.

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