The Siemens 3RA6120-1EP32 is a SIRIUS compact starter — a direct starter design that integrates a contactor and overload relay into a single 45 mm-wide housing. The control coil accepts 110-240 V AC/DC, so you can wire it to a standard control transformer or a DC supply without worrying about coil swap-out. The overload section offers adjustable Trip Class 10 and 20, letting you match the thermal curve to the motor start profile — Class 10 for shorter acceleration times, Class 20 for higher-inertia loads like fans or conveyors. Power dissipation runs 5.2 W AC maximum, 5.8 W DC maximum, which is within tolerance for a standard 45 mm-wide DIN-rail enclosure without forced ventilation.
Screw-type terminals on the main circuit accept 0.5 to 4 mm² solid or stranded, with two conductors per terminal up to 2.5 mm² each. Strip length and torque values follow the terminal marking — no special tools beyond a standard screwdriver. Dimensions: 170 mm height, 45 mm width, 165 mm depth.
Shock resistance is 60 m/s² (6 g) for 10 ms, three shocks per axis. Vibration resistance: 4 to 5.8 Hz at 15 mm displacement, then 5.8 to 500 Hz at 20 m/s², 10 cycles per axis. These ratings cover most machine-mounted applications without additional dampening.