Not at the modules though. If you parallel source circuits together and there is more fault current available to a faulted source circuit than it is rated for, either the conductor or the module, then OCP is required in the DC combiner, or in the harness if that is being used to parallel source circuits. OCP is usually required whenever you parallel more than 2 source ckts, but it was not always that way. There was a time when the series fuse rating of some modules was much larger than the Isc value. At that time you could parallel 3, 4, or more source circuits without OCP. Those days are gone though.