The ABB 1SFA899211R3880 is a PSTP-2880/16 thyristor pair — two matched power semiconductors packaged for use as the output stage of an ABB PSTX softstarter. It belongs to the softstarter product class, meaning it controls the inrush current during motor start by phase-angle firing of the thyristors, reducing mechanical and electrical stress on the driven load.
What the PSTP-2880/16 designation means for fit
The PSTP-2880/16 string identifies this thyristor module variant. The 2880 and 16 are the part number suffix; verify the blocking voltage and current rating against the softstarter's rating plate.