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Sensitivity of S1/2/3

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How "sensitive" are the S1,2,3 ? 

I know often 1-5V this is already enough to see it as "on" for some devices.
I would like to check if I need a relay between the switch and the Shelly, like it’s needed for many motion detectors. 

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Posted (edited)

Any Shelly input is activated by a very small current (approximately 37μA) flowing from terminal SWx or IN-x to terminal L (or GND). This current is driven by 3V DC. Moreover, the input will by activated by neutral potential at the above mentioned terminals. Due to the fact the flowing current in this case is some milliamperes, there will be a certain amount of additional heat dissipation in the Shelly. Hence, this kind of activation is not recommended with manual switches.

Edited by thgoebel
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