TMG Posted July 24 Share Posted July 24 Hello, I have replaced my Shelly 3EM with a Shelly 3EM pro. With regard to the 4 terminals, I would like to know whether the N terminal is absolutely necessary In other words, what is the additional N-clamp, which is not included in the scope of delivery, for? Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted July 24 Members Share Posted July 24 (edited) The current clamp „N“ is absolutely unnecessary! With Shelly 3EM it is possible to detect differences between the (geometrical) sum of the three phase currents and the current in neutral wire. Via an action, the switch of 3EM could be triggered. With some trade-off, a RCD could be build with this… Due to the fact, this mechanism isn’t available with Shelly pro 3EM, I see absolutely no benefit in installing the N current clamp. Edited July 24 by thgoebel 1 Quote Link to comment Share on other sites More sharing options...
TMG Posted July 24 Author Share Posted July 24 Just now, thgoebel said: The current clamp „N“ is absolutely unnecessary! Thanks for fast reply 1 Quote Link to comment Share on other sites More sharing options...
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