I am an Industrial Controls Engineer and I am up to my neck in a project where I am being forced to use circuit breakers per a customer requirement which is a pain when trying to maintain high SCCR rating. My issue is that I have to maintain a min 40kA SCCR for my panel. I have a 480V 3ph VFD that is rated for 100kA SCCR which is great, no problem. Connected to the line terminals, R S and T I have a 65kA rated circuit breaker contactor combination for power control and overcurrent protection, again no problems there. DIRECTLY after the VFD connected to terminals U V and W (motor terminals) I have some safety contactors that are only rated 5Ka. These contactors have to remain in that location due to my category 3 safety circuit requirements. The question is, does the VFD act like a current limiting device since the connections between the line terminals and the motor terminals passes through electronic circuitry (rectifiers etc) and there is no real direct connection? Or am I in trouble here, and my "weakest link" now becomes the safety contactors after the drive at 5kA SCCR??