The ABB 1SFA899311R3880 is a PSTP-2880/18 thyristor module — the power stack inside a PSTX-series softstarter. It's the silicon that ramps voltage to the motor windings during start, then bypasses once the contactor pulls in. If you're rebuilding a PSTX drive end or sourcing a spare for a panel that's already wired, this is the part that carries the load.
What the PSTP-2880/18 designation tells you
The PSTP-2880/18 marking identifies the voltage and current class within the PSTP family. It's designed to mate with the PSTX softstarter frame — the control board and bypass contactor are separate line items. When you swap one of these, verify the gate-drive cable and the heatsink compound interface; the module clamps into the same bus-bar stack as the original.
Compliance paperwork on file
RoHS compliant per EU Directive 2011/65/EU and Amendment 2015/863. The module falls outside WEEE scope and is classified as B2B. TSCA and Conflict Minerals declarations are available from ABB's compliance repository — useful if your QA team needs a paper trail for the incoming inspection.