SIRIUS 3RA2 reversing starter — 750 W at 400 V, Class 10
The Siemens 3RA2225-1BB23-0BB4 is a SIRIUS 3RA2 non-fused reversing motor starter in size S0, combining a contactor and thermal overload relay in one assembly for forward/reverse control of a three-phase motor. Rated motor power is 750 W at 400 V (AC-3), with a corresponding current of 1.63 A at 480 V and 1.72 A at 600 V; the contactor inside is a 3RT2023-1BB40, and the overload release is thermal bimetallic, trip class 10.
Dimensions and clearances for panel layout
The starter measures 90 mm wide, 265 mm tall, and 130 mm deep — size S0 footprint. Required clearances around the unit: 30 mm upward, 10 mm forward, 10 mm downward, 9 mm at the sides, and 0 mm backward. These clearances ensure adequate airflow for the thermal overload and room for wiring access; the 0 mm rear clearance means it can sit flush against the back panel.
Environmental limits and substance compliance
Operating temperature range is -20 to +60 °C; storage range -50 to +80 °C; transport range -55 to +80 °C. Pollution degree 3 (industrial environment). Substance prohibitance date is 03/01/2017 — the starter complies with RoHS and REACH substance restrictions as of that date.
Supplied sub-assemblies and integration
The unit ships with a 3RT2023-1BB40 contactor, a 3RA2921-1BA00 link module, a 3RA2922-1AA00 busbar adapter, and a 3RA2923-1BB1 RH assembly kit — all pre-assembled as a reversing starter. The circuit-breaker size is S00, meaning the upstream protection device fits the same SIRIUS S00/S0 rail system.