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Smart Home Forum by FIBARO Team

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Electrical isolation



I need to control an air conditioning system which presents 2 zero (well very low) voltage connectors from a logic board that I short to tell it to switch on. I can't control the main power supply because of the high load and the need for the compressor heaters to be on (in the winter) at least 5 hours before use.


The single Fibaro switches have two Live feeds. In this case is one of the feeds only connected to the switching function (Presumably a micro relay) so that this live and terminal Q could be used to short (start) the Air con?

Are they electrically isolated from the mains supply on the other live terminal?

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@[email protected], can you use contactor (or dumb relay) to isolate 230V from low voltage?


We use Door opener as an example, but it could be used for almost everything.

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You can use relay with dry contact, like FGS-212 or any other brand

For example here a link of

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