The ABB 1SFA899311R1501 is a PSTHM thyristor module, carrying the technical identifier PSTHM-501/18. It is designed as a replacement power component for ABB PSTX series soft starters, which means if you are maintaining a PSTX unit and the thyristor stack fails, this is the factory-specified module for that repair.
What It Fits and What to Watch
The PSTHM-501/18 is a thyristor module — the power-switching element inside a soft starter. It is suitable for the PSTX product class, so it physically and electrically replaces the corresponding thyristor assembly in those units. If you are rebuilding a PSTX, this is the correct internal module. The technical information (PSTHM-501/18) confirms the specific variant; verify your PSTX model's service manual to confirm this revision matches your unit's existing thyristor assembly before committing the BOM line.
RoHS compliant per EU Directive 2011/65/EU and Amendment 2015/863. The module is classified as Business To Business and not within WEEE scope. CAD dimensional drawing 2CDC001079B0201 and the full data sheet (1SFC132013C0201) are the reference documents for mechanical fit and electrical ratings.