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What will cause a Motor Logic Solid State Overload Relay to trip out ``prematurely`` when using it with a variable frequency drive?

Why are solid state overload relays incompatible with VFDs and VSDs? 

Product Line:
9065 Motor Logic Overload Relays

Products sold in North America 

 There can also be harmonics issues when using it with a VFD, whether it's wired into the input or output of the drive.

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