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Can you use the motor insight C441 or C445 overload relays on the output of the drive/VFD?

The C441 Motor Insight relay is designed to be used within a frequency range of 47-63Hz only.  So assuming the VFD is going to operate outside of that range, you should not use the C441 on the output of the drive.  If the drive was going to run within that frequency range it would work.  But when the C441 is being run outside of this frequency range, the current is no longer being accurately monitored.

The C445 is designed to be used on the output of a drive. It can accurately read current from 20-80Hz.

Answer per Dana Leland, Product Manager, 2/19/2016.