The Siemens 3RA1317-8XB30-1AP0 is a reversing contactor assembly — two mechanically and electrically interlocked contactors in one package, Size S00, rated for AC-3 motor duty at 5.5 kW and 12 A at 400 V.
Lifecycle and replacement
This part is a phased-out product. The official Siemens successor is the SIRIUS 3RA2 series, with the preferred replacement order code 3RA2317-8XB30-1AP0. If you are freezing a BOM or managing a last-time-buy, the 3RA2317-8XB30-1AP0 is the drop-in functional equivalent — same Size S00 footprint, same AC-3 ratings, same 230 V AC coil, same screw terminals.
The AC-3 rating of 12 A at 400 V governs motor switching — this is the current the contactor can make and break across a squirrel-cage induction motor during starting and running. For a 400 V three-phase motor, 5.5 kW output corresponds to roughly 12 A full-load current, so the contactor is sized for that motor frame without headroom for a larger load. The Size S00 body (67 mm high, 90 mm wide, 72 mm deep) fits the standard DIN-rail footprint; the IP20 front means it is protected against finger contact but not washdown — install inside a panel.