The Siemens 3RA6120-0DP30 is a SIRIUS compact starter in a direct-starter (DOL) design, rated for continuous operation per IEC 60947-6-2. The adjustable CLASS 10 and 20 trip class lets you match the overload curve to the motor start profile: CLASS 10 for fast-starting pumps and fans, CLASS 20 for high-inertia loads like conveyors or crushers that need a longer acceleration window. The control supply accepts 110-240 V AC/DC. Power consumption stays under 6 W AC or 5.1 W DC. At 400 V it switches motors up to 5.5 kW (7.5 hp). At 480 V and 600 V the rated operational current is 12 A, so it fits NEMA-size 1 motor starters in North American installations. The screw and snap-on mounting to standard DIN rail means it integrates into existing panel layouts without drilling or brackets.
The compact starter measures 45 mm wide, 170 mm tall, and 165 mm deep — a single-module footprint that fits standard 45 mm DIN-rail slots. Mounting position is any orientation, so it works in horizontal or vertical rail layouts. Vibration resistance is rated at 4-5.8 Hz with 15 mm amplitude and 5.8-500 Hz at 20 m/s² for 10 cycles — suitable for installation on machine-mounted panels subject to moderate vibration. Shock resistance of 60 m/s² (6g) for 10 ms in all axes covers handling during transport and occasional machine impacts.