The RM420-015B replaces the RM420-015. All orders will be changed automatically.
The only difference is the power supply. The RM420-015B is supplied by Power over Ethernet using a power supply with integrated Power over Ethernet inserter (PSA16U480POE). The socket for the 48V power supply at the display is removed.
If you order a 52-4015A, a 52-3015A and a PSA16U480POE together, you will receive the same hardware kit as in item RM420-015B.
Please find further information in the following document.
TFT Display Differences