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Is it possible to connect ATV312 to more than 3 motors? Also, Is it possible to Use an EASYPact EZC Circuit breaker as protection for the Drive?

Yes, It is possible to Connect 3 or more motors to the same Drive ATV312, But the Selection of Drive is based uppon the total sum of the 3 Power ratings and currents.
In this case, it is necessary to provide external thermal protection for each motor using probes or thermal overload relays. If three or more motors are connected in parallel, it is advisable to install a motor choke between the drive and the motors regardless the cable lenght.

Also, For the EZC Breaker, it is not recommended for motor application.

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