The Siemens 3RA2210-0HA03-0SB4 is a SIRIUS reversing starter, size S00, that combines a contactor assembly and a thermal overload relay in one package for reversing motor control. It is rated 0.8 A at 400 V in AC-3 duty, which means it switches three-phase squirrel-cage motors up to that current during starting and plugging — the AC-3 rating is the one that governs real motor-load switching, not the resistive AC-1 figure. The 180 kW power rating at 400 V confirms the motor size it can handle in reversing applications. The thermal bimetallic overload relay provides Class 10 trip protection, so it allows a motor to accelerate under load without nuisance tripping but still protects against sustained overcurrent. The 24 V coil voltage is standard for control circuits in modern panels. The supplied contactor is a 3RF3403-1BD04 and the link module is a 3RA1921-1DA00, so the reversing starter arrives as a pre-assembled functional unit — not a kit of loose parts. The operating frequency is 50/60 Hz, covering both common line frequencies.
The reversing starter measures 114 mm deep, 90 mm wide, and 203 mm high. The mounting position is vertical, which is typical for DIN-rail components in control panels.