The Siemens 3RA6120-2AB33 is a SIRIUS compact starter — a direct-on-line (DOL) starter that combines a contactor and overload relay in a single 45 mm wide package, saving panel space over discrete components. It is rated for continuous operation per IEC 60947-6-2, with an adjustable trip class — select CLASS 10 for standard motor starts or CLASS 20 for high-inertia loads like fans and centrifuges. The 24 V AC/DC control voltage (50/60 Hz compatible) means it drops into existing 24 V control circuits without an extra transformer, and the 53 kA breaking capacity at 400 V gives it solid fault-clearing headroom for most industrial distribution panels.
The 165 mm depth and 191 mm height keep it shallow enough for 200 mm deep enclosures, and the plug-in main circuit terminals (without screw terminals) speed wiring in panel builds.