3 Phase Energy Meter to measure multi channel
You could possibly do this provided that you don't want to record energy usage.


Voltage will be the same throughout and since they are permanently connected no further work is required.
Currents are the problem. If you are using typical current transformers then these will have an output of 5 A full scale on the secondaries. Any switching would have to handle that level of current.
CTs should not be allowed to go open-circuit while current is flowing in the primary. Being current transformers the output voltage will go very high in an attempt to drive the current across the open-circuit. This may destroy the CT. CTs have to be short-circuited prior to the meter being disconnected and the switch has to be able to handle 5 A.
If you can sort out the CT problem then power factor (PF) can be measured.








simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. Switching system for one phase of three-phase system.

The switching circuit would have to guarantee that that only one CT per phase is not short-circuited and that the phase being read is connected to the burden in the meter. A rotary switch with 5 A contacts would be required.

I do not recommend your proposal.