Breaking capacity and coordination for the panel schedule
The 3RA6250-2CB32: Rated power at 400 V is 1 500 W, which for a 400 V three-phase motor corresponds to roughly 2.2 A full-load current — the starter is sized for fractional-horsepower reversing drives like conveyor shuttles or valve actuators.
Trip class adjustability and motor protection
Trip class is adjustable between CLASS 10 and CLASS 20 — CLASS 10 protects motors with fast thermal time constants (pumps, fans), while CLASS 20 allows the longer inrush of high-inertia loads like centrifuges or crushers without nuisance tripping. The same starter body covers both regimes; the adjustment is a selector on the unit, not a heater change. Rated for continuous operation per IEC 60947-6-2, so it carries rated current indefinitely without derating — no need to oversize for duty cycle in a 24/7 process line.
Mounting and integration into the panel
Mounts vertically on standard DIN rail with screw and snap-on fastening — the 90 mm width and 165 mm depth fit a standard 200 mm deep enclosure with room for the incoming cable bend radius. Any mounting position is allowed, but the recommended orientation is vertical on horizontal DIN rail — this keeps the thermal overload calibration within the published trip curve.
Environmental and mechanical endurance
Shock resistance is 6g for 10 ms across all axes; vibration resistance follows a 4 to 500 Hz profile at 20 m/s², which covers most industrial machine vibration spectra without additional damping. Degree of pollution 3 means the unit is rated for conductive pollution environments — typical in panel builds near machining coolant mist or cement dust — without requiring conformal coating on the PCB.
The 3RA6250-2CB32 is a standard catalog item in the Siemens SIRIUS compact starter family, so it is sourced through authorized distribution channels against the BOM quantity.