The Siemens 3RA1324-8XB30-1AC2 is a reversing contactor assembly from the SIRIUS family, built in Size S0. It is rated for AC-3 motor duty at 5.5 kW and 12 A at 400 V, meaning it directly switches a three-phase motor of that size in both forward and reverse directions.
Lifecycle and replacement
This order code is a phased-out product. The manufacturer lists the direct successor as the 3RA2324-8XB30-1AC2, which is the preferred replacement type. For a BOM line that currently specifies the 3RA1324-8XB30-1AC2, the successor carries the same S0 footprint, AC-3 rating, and 24 V AC coil, so panel layout and wiring remain unchanged.
The S0 contactor size occupies a 100 mm width on the rail, so plan for that footprint when laying out a panel with multiple contactors or a reversing pair.
Environmental and operating range
The assembly includes an electrical and mechanical interlock between the forward and reverse contactors, which prevents simultaneous closure — a requirement for any reversing motor starter.