Part J9739A is compatible in the following Models:

Aruba 2920 Switch Series

HPE 2920-24G Switch - J9726A
HPE 2920-48G Switch - J9728A

HPE Networking Router Power Supplies

HPE X331 165W 100-240VAC to 12VDC PS - J9739A

HPE Networking Switch Redundant Power Supplies

HPE 640 Redundant/External PS Shelf - J9805A