What this SIRIUS 3RA2120-1AA23-0BB4 motor starter does
The Siemens 3RA2120-1AA23-0BB4 is a non-fused direct motor starter from the SIRIUS family, combining a contactor and a thermal bimetallic overload relay in one S0-frame package. The 24 V coil voltage matches standard control-voltage rails in industrial panels; the unit operates on 50/60 Hz supply.
Mounting and panel fit — S0 frame, DIN-rail snap-on
Clearance requirements: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the sides, and 0 mm backwards — plan the enclosure depth and gland-plate layout accordingly.
The supplied contactor is a 3RT2023-1BB40 and the link module is 3RA2921-1BA00 — both are standard SIRIUS components, so spares and replacement parts are readily available through the same supply chain.
Environmental and compliance documentation
Operating temperature range is -20 to +60 °C; storage range is -50 to +80 °C; transport range is -55 to +80 °C — the wide storage envelope supports cold-weather warehousing. Substance prohibitance date is 03/01/2017, indicating RoHS and REACH compliance documentation is available from Siemens for this order code.