The Siemens SIRIUS 3RA6120-1CB32 is a compact starter — a direct-on-line motor starter that integrates 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's built for sustained motor duty in industrial control panels, not intermittent jogging. For a 45 mm wide starter, that's a serious short-circuit rating; it lets you skip a separate backup fuse in many panel designs, saving a DIN rail slot.
Trip Class and Motor Protection
Trip Class is adjustable between CLASS 10 and CLASS 20. Rated power at 400 V is 1500 W (1.5 kW), which lines up with a standard 2 HP motor on 400 V three-phase. The rated current at 480 V and 600 V is 4 A — that's the continuous thermal current the overload relay is calibrated for.
Mounts on standard DIN rail — snap-on with a screw for extra security. Mounting position is any orientation. Dimensions are 170 mm high × 45 mm wide × 165 mm deep. That 45 mm width is one standard module — it occupies a single slot on a DIN rail, leaving room for a busbar system or adjacent auxiliary contact blocks.
The coil is 24 V AC/DC — universal control voltage, so one part works on both 24 VAC and 24 VDC control circuits. Power draw is 2.8 W AC max, 2.9 W DC max — low enough that a standard 24 VDC power supply can drive several of these without derating.
Vibration resistance is 4 to 5.8 Hz at 15 mm amplitude, then 5.8 to 500 Hz at 20 m/s² — tested for 10 cycles per axis, which covers typical motor-induced vibration on a machine frame. Shock resistance is 60 m/s² (6 g) for 10 ms, three shocks per axis. That's enough for most conveyor and pump applications; if the panel is mounted on a press or stamping machine, check the shock profile against this spec.