The 531X305NTBAPG1 card was developed by General Electric as a NTB/3TB terminal board. This card was originally developed for the 531X series of replacement drive boards. Members of this board family are suited for installation into a number of drives across the GE brand. When installed, this card provides access to a number of interfacing tools not found in the drive. Applications include serial and relay outputs, low level analog I/O, encoders, and power supplies.