JBD doesn't the NEC actually require the use of a OCPD for the short circuit and ground fault protection of motors?
As shown in 430.51.
IMO both the NEC and the NRTLs expect the branch circuit OCPD to play a part in the protection of many types of utilization equipment.
I would not call it 'secondary' I would say the tasks are equal.
JMO, Bob
