The ABB 1SFA899302R1175 is a PSCT-175 current transformer, designed as an accessory for the PSTX series of softstarters. It provides current sensing to the softstarter's control electronics for motor protection and monitoring functions. This is a component-class transformer — it mounts inside the softstarter enclosure or adjacent in the panel, wired between the motor cables and the PSTX control board. It does not function as a standalone current transformer for general metering.
The 1SFA899302R1175 is classified as Obsolete by ABB. This means the part is no longer manufactured and is not available through standard ABB distribution channels. The part is quoted to order, not held on a shelf.
Fit Verification for PSTX Softstarters
The part is explicitly listed as Suitable For PSTX softstarters. The PSCT-175 designation indicates the specific turns ratio and current range matched to the PSTX control electronics. If your PSTX unit calls for a PSCT-175 on its wiring diagram or parts list, this is the correct transformer. No pinout or wiring detail is carried in the listing. The ABB data sheet (document 1SFC132013C0201) and CAD drawing (2CDC001079B0201) are the authoritative sources for connection diagrams and mechanical fit. These documents are available for download and should be reviewed before committing the part to a panel layout.