Looking into price list there are two Power Adaptors for Aruba Instant On
After checking all datasheet for Aruba Instant On it looks that for all AP first Power Adaptor is suitable.
The question is for what is second one PA?
@Gener1 The R2X21A is only used for the AP11D as it has PoE In and Out. Configuration: Power over Ethernet (PoE) on E0: 802.3af (class 3) or 802.3at (class 4). When using 802.3af, POE-out on E3 is disabled.
The R2X20A is used for AP11, AP12 and AP15.