The 3RA2120-0JA23-0BB4: This is a SIRIUS non-fused motor starter, direct starter design, size S0. It combines a contactor and a thermal overload relay in one unit, intended for switching and protecting three-phase motors up to 690 V AC-3. The 24 V DC coil draws 5.9 W holding power — a common control voltage for PLC-driven panels. The coil is electromechanical, so expect a distinct pick-up and drop-out threshold; verify your DC supply can deliver the inrush (not listed here) before committing the BOM. Motor power ratings are given per voltage: 250 W at 400 V, 370 W at 500 V, 550 W at 690 V, and 0.5 hp at 575/600 V. These are the maximum full-load motor sizes the starter can handle at those line voltages — oversizing the motor beyond these figures risks nuisance tripping or contact welding under locked-rotor current.
The mounting position is vertical only — horizontal mounting would change the thermal overload calibration. Clearance requirements: 30 mm upward, 10 mm forward, 10 mm downward, 9 mm at the side, and 0 mm backward (flush to the panel backplane). These are the minimum free-air gaps for heat dissipation and arc flash clearance. Dimensions: 193.1 mm high, 45 mm wide, 107 mm deep. The 45 mm width (about 2.5 modular DIN units) fits standard enclosure cutouts. The supplied circuit-breaker is a 3RV2011-0JA10 (size S00), and the supplied contactor is a 3RT2023-1BB40 — these are matched by the factory for coordination, so swapping either component breaks the short-circuit rating.
Environmental and compliance notes
Operating temperature range is -20 to +60 °C; storage range is -50 to +80 °C; transport range is -55 to +80 °C. The degree of pollution is 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — typical in industrial control panels without climate control). The substance prohibition date is 03/01/2017, indicating RoHS compliance per EU Directive 2011/65/EU.