The Siemens 3RA6120-1DP32 is a SIRIUS compact starter — a direct starter design that combines a contactor and overload relay in a single 45 mm wide package. It's rated for continuous operation per IEC 60947-6-2, meaning it handles sustained motor starting duty without derating. The adjustable Trip Class 10 and 20 lets you match the overload curve to the motor's starting profile: Class 10 for faster starts (e.g., centrifugal pumps), Class 20 for high-inertia loads like fans or conveyors that need a longer ramp.
Control Voltage and Wiring
The coil accepts AC/DC 110–240 V (50/60 Hz), so it works across common control voltages worldwide without needing a separate transformer tap. Power consumption is 6 W AC / 5.1 W DC — low enough for a PLC output to drive directly. Screw-type terminals accept 0.5–4 mm² solid or 2x 0.5–2.5 mm² stranded. The 165 mm depth and 170 mm height fit standard 45 mm wide DIN-rail enclosures; mounting position is any orientation, though the manual recommends vertical on horizontal DIN rail for optimal cooling.
Shock resistance 6g (60 m/s²) for 10 ms, vibration tested to 20 m/s² at 5.8–500 Hz. Two LEDs provide local status indication — typically for run and fault. No IO-Link or AS-Interface onboard, so communication is limited to hardwired control signals.