Reversing starter for motor control panels
The Siemens 3RA6250-1DP33 is a SIRIUS compact reversing starter — a single device that handles forward/reverse motor control without separate contactors and overloads. The adjustable trip class (CLASS 10 and 20) lets you match the overload curve to the motor start profile — CLASS 10 for fast-starting loads like pumps, CLASS 20 for high-inertia fans or conveyors that need a longer acceleration window.
Breaking capacity and coordination
At 480 V and 600 V, the continuous current rating is 12 A, matching NEMA motor frames up to about 7.5 hp at 480 V. Rated for continuous operation per IEC 60947-6-2, with pollution degree 3 — suitable for industrial environments where conductive dust or humidity is present.
Dimensions are 90 mm wide, 170 mm high, 165 mm deep — fits a standard 90 mm wide DIN-rail footprint. Screw and snap-on mounting means it clips onto the rail and can be screw-fastened for vibration resistance. The main circuit uses plug-in connections without terminals, which speeds wiring and reduces loose-connection risk. Mounting position is any orientation, though the recommended position is vertical on a horizontal standard mounting rail.
Control voltage and environmental ratings
Control voltage is 110 to 240 V AC/DC — covers common global control voltages without needing a separate transformer tap. Power consumption is 6 W AC or 5.1 W DC, low enough that multiple starters can share a control transformer without overloading it. Three LEDs on the front indicate status — typically run, fault, and power-on. Shock resistance is 6g (60 m/s²) with 10 ms pulses across all axes, and vibration resistance follows a 4-500 Hz profile with 15 mm displacement at low frequencies and 20 m/s² acceleration above 5.8 Hz — enough for machine-mounted applications near rotating equipment.