The Siemens 3RA1125-0DA23-1BW4 is a nonreversing combination starter in the SIRIUS S0 frame, rated for 0.22-0.32 A with a 24 VAC control voltage. It integrates a contactor, overload relay, and short-circuit protection into one FastBus-mount unit, saving panel space over discrete components. The MSP auxiliary contact provides one SPDT NO/NC set, and a separate front-mount NO auxiliary contact is included for status feedback or interlocking.
The 0.22-0.32 A current range sets the motor full-load current (FLC) it can protect — this is not a contactor-only rating; the overload relay inside is factory-set or adjustable to that band. A 24 VAC control coil means the starter pulls in on a 24 VAC signal, common in older or transformer-isolated control circuits; verify your control transformer supplies clean 24 VAC at the coil's inrush, not just holding current. Frame size S0 sets the physical footprint and the maximum motor current the overload block can handle. UL File E156943 in Vol.1 Sec.14 confirms the starter carries UL listing for the US market, meaning it meets UL 508A requirements for industrial control panels. If your panel requires CSA or CE marks, verify those are also on the nameplate — the description only explicitly states UL.
Combination starters like this one are the standard way to switch and protect small three-phase motors in industrial control panels — conveyors, pumps, fans, and compressors up to the rated current. The nonreversing variant handles one direction of rotation; for reversing applications you would need two contactors or a dedicated reversing starter.
This is an active, standard-catalog Siemens SIRIUS part. Submit an RFQ for the latest delivery window.