What this reversing starter does
The Siemens SIRIUS 3RA6250-0DB30 is a reversing compact starter — a single device that combines a contactor and overload relay in a reversing configuration, meaning it can start a motor in either direction without a separate reversing contactor assembly. It's rated for continuous operation per IEC 60947-6-2, so it's built for sustained duty on conveyor drives, pump reversals, or any line that needs forward/reverse control from one package. The 24 V DC/AC coil (24... 24 V at 50 Hz, 24 V at 60 Hz) keeps control voltage consistent across line frequencies — no separate coil variant needed if your plant runs mixed 50/60 Hz panels. Power draw is 2.8 W AC max, 2.9 W DC max, so a 24 VDC supply sized for a few of these won't get hammered.
That's a high-interrupt rating for a compact package — it means you don't need a separate upstream fuse or breaker rated lower than 53 kA at this voltage. Trip class is adjustable between CLASS 10 and CLASS 20.
Dimensions are 90 mm wide, 170 mm tall, 165 mm deep. The main current circuit connection is plug-in without terminals — meaning the power connections use a separate terminal block that plugs into the base. That speeds up replacement: you can unplug the starter without disconnecting the main power wiring. Vibration resistance is tested to 4–5.8 Hz at 15 mm amplitude and 5.8–500 Hz at 20 m/s² for 10 cycles; shock resistance is 60 m/s² (6 g) for 10 ms per 3 shocks in all axes. Good for installation on a machine frame, not just a stationary panel.