What this reversing starter does in a panel
The Siemens SIRIUS 3RA6250-0BP30 is a reversing compact starter — a single device that combines a contactor, overload relay, and reversing interlock for a motor load up to 370 W at 400 V. It is rated for continuous operation per IEC 60947-6-2, meaning it handles sustained motor duty without derating. The 53 kA short-circuit breaking capacity at 400 V gives it the SCCR headroom to sit downstream of a high-capacity feeder breaker without needing a separate current-limiting fuse for fault coordination. The control voltage accepts AC or DC from 110 to 240 V, so it works across common control transformer taps and battery-backed DC supplies without a separate coil voltage variant. The adjustable Trip Class (10 and 20) lets you match the overload curve to the motor start profile — Class 10 for faster-starting pumps and fans, Class 20 for higher-inertia loads like conveyors or crushers.
The 90 mm width and 170 mm height fit a standard 4-module-wide panel footprint. The main current circuit uses plug-in connections without terminals — you supply the screw-clamp or spring-cage terminals to match your wire gauge. The three onboard LEDs give local status indication for run, overload, and fault, which speeds troubleshooting on the line side.