The Siemens 3RA1120-1JD24-0BW4 is a non-reversing combination starter in the SIRIUS series, Frame Size S0, for FastBus mounting in IEC control panels. It integrates a contactor and overload relay, rated for 7 - 10 A motor loads with a 48 VDC control voltage.
The 7 - 10 A rating covers small induction motors, pumps, and fans in the fractional-to-low-horsepower range under IEC 60947-4-1. The 48 VDC control coil is a deliberate choice for safety circuits or DC-supplied panels — common in process plants where 24 VDC is standard, but 48 VDC gives longer cable runs with less voltage drop. Verify your control transformer or DC supply matches 48 VDC nominal; the coil holds in at that voltage and drops out reliably below the undervoltage threshold. The non-reversing configuration starts and stops the motor in one direction only. For reversing duty you need a separate reversing starter or a pair of mechanically interlocked contactors.