Hello,
I accidentally powered my Xbee PRO S1 module with a reverse voltage. It still works now but now I am a bit concerned about its reliability.
Do you maybe know if the Xbee includes a protection diode or something equivalent?
Hi,
I think , for this conformation you should contact Digi Technical Support through Support Web portal on the digi website.
This is the answer from support in case anyone is curious about it.
Well done, Digi! 
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Thank you for contacting Digi. Yes, the XBee 80.15.4 modules do provide protection for just a case.