750 W at 400 V — what the AC-3 rating means for the motor branch
The 3RA2120-1BA23-0AK6: That 750 W figure at 400 V is the continuous motor power the starter can handle under normal starting and running conditions, provided the upstream short-circuit protection is coordinated for the S0 feeder size. This is the standard class for general-purpose motor starting — it lets the motor accelerate through the inrush without nuisance tripping, provided the start time stays under the 10-second ceiling.
Mounting and panel fit — S0 footprint on DIN rail or screw-fixed
The vertical mounting position is specified; horizontal or inverted mounting would shift the thermal overload calibration and is not supported without a derating check. The S0 feeder size (45 mm wide, 97.1 mm deep, 193.1 mm tall) matches the standard S0 contactor/circuit-breaker footprint — it occupies one 45 mm slot on the rail, leaving 30 mm clearance upward and 10 mm forward/downward for wiring and heat dissipation. The supplied contactor is a 3RT2023-1AK60, and the link module is 3RA2921-1AA00 — these are the factory-matched pair that give the starter its coordinated Type 2 protection profile. If you are replacing a failed unit in an existing panel, confirm that the replacement carries the same supplied contactor order code; swapping in a different contactor variant changes the coordination and voids the UL/IEC listing for the assembly.
Active production — sourcing posture for the BOM line
Operating ambient range is -20 to +60 °C, storage -50 to +80 °C, transport -55 to +80 °C. The thermal overload calibration is referenced to 40 °C ambient; above that, the trip current must be derated per the SIRIUS application manual. Pollution degree 3 (conductive pollution) means this starter is suitable for control panels in industrial environments where occasional condensation or light dust is present.