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Unfortunately, I didn’t get an answer to my question about the transmission ratio of the 3CT63 triple current transformer. By own experiments (don’t possess such a transformer) it seems clear that the 3CT63 has another transmission ratio than the standard 3000:1 or has an integrated additional shunt resistor.

As @Olsche mentioned above, there is no means of setting the transformer type with Shelly 3EM. Thus, transmission ratio MUST be 3000/1 or lower. In this case, an additional resistor could be used to set the ratio to 3000:1 as described here:

https://www.smarthome-forum.eu/thread/19721-einsatz-von-fremdwandlern-an-shellies-der-em-familie/
 

The connection with Shelly 3EM should be not a major issue cause the 3CT63 has screw terminals. With the sacrifice of am excess 120A current clamp, the two wires per phase could be easily connected with the 3CT63. Calibration could be managed cause transmission ratio must be 3000:1 to fit the 3EM requirements.

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