Andrei S Posted January 6 Share Posted January 6 Hello. I bought a Shelly 3EM to monitor my energy consumption and use it as an input for a contactor to cut off the power whenever the voltage move above a certain level. I also bought a 32 A three phase contactor that I want to use combined with contactor control. Now... I've measured the voltage between I and O pins, but none of the gives me 230V. How can I connect the 230V contactor coil to my Shelly 3EM? Also, that turn on/turn off button should make it turn on and off contactor coil,right? Thanks! Andrei. Quote Translate Revert translation? English (American) Finnish French German Italian Portuguese (European) Spanish Link to comment Share on other sites More sharing options...
Members thgoebel Posted January 6 Members Share Posted January 6 Andrei, Pins I and O of Shelly 3EM are the contacts of a relay! Thus, you’ll have to connect the live wire to pin I, one end of the relay coil to pin O and the other end of the coil to neutral. Don’t forget to install a snubber (R/C combination) across the relay coil! Good luck, Thomas 1 Quote Translate Revert translation? English (American) Finnish French German Italian Portuguese (European) Spanish Link to comment Share on other sites More sharing options...
Andrei S Posted January 6 Author Share Posted January 6 Ohh, ok. I'm used with sonoff devices with live output. So it's an open contact that will close whenever I turn on/off that internal relay. I'll try this, thanks! Quote Translate Revert translation? English (American) Finnish French German Italian Portuguese (European) Spanish Link to comment Share on other sites More sharing options...
Andrei S Posted January 6 Author Share Posted January 6 (edited) @thgoebel Is the snubber really necessary? Edited January 6 by Andrei S Quote Translate Revert translation? English (American) Finnish French German Italian Portuguese (European) Spanish Link to comment Share on other sites More sharing options...
Members thgoebel Posted January 7 Members Share Posted January 7 Give it a try and test it without snubber. But don’t blame me if the Shelly is restarting frequently… Quote Translate Revert translation? English (American) Finnish French German Italian Portuguese (European) Spanish Link to comment Share on other sites More sharing options...
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