Hi my name is Eric Moyers, I work in the Small Business Support Center (SBSC).
Currently the SRW224G4P does not support PVE or (Protected Ports). However I do know that our newest family of switches do support PVE. I am referring to the Cisco 300 Series Switches. In that family, model SF300-24P most closely relates to your SRW224G4P.
Hope this helps.
Eric Moyers
Cisco SBSC Network Engineer
1-866-606-1866