Motor starter identity and lifecycle status
The Siemens 3RA2125-1CA23-0BB4 is a non-fused motor starter from the SIRIUS 3RA2 series, a direct starter design combining a contactor and thermal bimetallic overload relay in one compact assembly.
Trip class and motor protection coordination
The overload release is thermal bimetallic, providing inverse-time protection that tracks the motor heating curve without a separate electronic module.
Panel integration and mounting constraints
Width is 45 mm, depth 107 mm, height 193.1 mm — fits a standard S0 feeder footprint on DIN rail or screw-mounted with the included push-in lug. Mounting position is vertical only; clearance requirements: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, 0 mm backwards — plan the enclosure layout accordingly.
Rated performance and voltage range
Rated at 750 W at 400 V (AC-3), 2.15 A at 480 V, 2.24 A at 600 V — covers 0.5 hp at 200/208 V up to 1.5 hp at 575/600 V. Maximum AC-3 operating voltage is 690 V, with a rated frequency of 50...60 Hz — suitable for global 400 V and 480 V line supplies.
Environmental and compliance envelope
Operating temperature range is -20...+60 °C; transport -55...+80 °C; storage -50...+80 °C — the starter can be stored in unconditioned warehouses and installed in ventilated enclosures. Degree of pollution 3 means the device is rated for industrial environments with conductive dust or occasional condensation — no additional conformal coating needed in typical panel conditions.