The Siemens 3RA6250-1BP33 is a SIRIUS compact reversing starter — a single device that combines a contactor and overload relay in a reversing configuration, sized for motor control panels where forward/reverse operation is needed without separate component wiring. Its coil accepts 110 to 240 V AC/DC (50/60 Hz), so it works across common control voltages without needing a separate coil voltage variant. The adjustable trip class (CLASS 10 and 20) lets you match the overload protection to the motor start profile — Class 10 for faster-starting loads like pumps, Class 20 for higher-inertia loads like conveyors or fans.
Rated power of 370 W at 400 V (0.5 hp at 460/480 V) defines the motor size it can switch; for a 400 V line, that covers fractional-horsepower motors typical in small conveyor drives, agitators, or pump applications.
Mounts vertically on a standard horizontal mounting rail (35 mm DIN) in any position — the enclosure orientation doesn't restrict panel layout. Main circuit connection is plug-in without terminals, so the base unit slides onto a pre-wired terminal block — speeds up panel assembly and reduces wiring errors on repeat builds. Accepts solid conductors from 0.5 to 4 mm² (or 2x 0.5 to 2.5 mm²) on the control terminals, covering the typical control wiring range for 110-240 V circuits.