I don't have enough context to fully understand what IPX641 refers to, as it's not a standard or widely recognized term. However, I can break down the components:

IPX likely stands for "Industrial Protocol eXtended" or could be referring to "Ingress Protection X", where X is a rating level.

The number 641 doesn't have a standard meaning on its own.

If this is related to an industrial protocol or standard, it might be specifying a particular version or model of some device or system.

If it's related to ingress protection ratings, 6 would typically refer to dust protection and 4 would refer to water resistance. However, the "1" at the end doesn't fit the standard two-digit IP rating format.

Without more context about where you encountered this term or what field it's related to, I can't provide a more specific explanation. Could you please provide more details about where you saw this or what it's related to?