The Siemens 3RA6120-2BB32 is a SIRIUS compact starter — a direct starter that integrates a contactor and overload relay into a single 45 mm wide unit for motor control in a panel. Rated for continuous operation per IEC 60947-6-2, it handles motor starting and protection with an adjustable trip class — select CLASS 10 for standard motor starts or CLASS 20 for high-inertia loads like fans or conveyors. The 24 V AC/DC control voltage (24 V at 50/60 Hz and DC) means it integrates directly into a standard 24 V control circuit without an extra transformer or rectifier.
Spring-loaded terminals on the main circuit accept 2x (0.25 to 1.5 mm²) solid or stranded conductors — that covers most motor leads and control wiring in a standard panel, and the spring cage speeds wiring versus screw terminals. Rated for 370 W at 400 V and 1.25 A at 480 V and 600 V, this starter is sized for smaller motors — think fractional-horsepower pumps, small conveyors, or fan drives in a control cabinet.
Vibration resistance to 20 m/s² and shock resistance to 60 m/s² make it suitable for installation on machinery or in mobile equipment panels, not just stationary cabinets.
The 24 V AC/DC control coil draws 2.8 W at AC maximum and 2.9 W at DC maximum — factor that into your 24 V power supply budget; it is well within the capacity of a standard 24 VDC PSU for a multi-starter panel.