The Siemens 3RA6250-1CB34 is a SIRIUS compact reversing starter — a single device that combines a contactor pair with overload protection for forward/reverse motor control in one 90 mm wide package. It mounts on standard DIN rail and is rated for continuous operation per IEC 60947-6-2. Control voltage is 24 V AC/DC, so it drops straight into a 24 V control circuit without needing a separate coil supply. Trip class is adjustable between Class 10 and Class 20, which lets you match the overload curve to the motor start profile — Class 10 for faster-starting loads like pumps, Class 20 for higher-inertia loads like conveyors or fans.
Fastens with screw or snap-on mounting onto standard DIN rail. Dimensions are 170 mm high by 90 mm wide by 165 mm deep — fits a standard panel footprint with room for side-by-side grouping. Main circuit wiring uses screw-type terminals accepting 0.5 to 4 mm² solid or stranded, or 2x 0.5 to 2.5 mm². Strip length and torque follow standard Siemens SIRIUS practice. Rated for any mounting position, with vibration resistance up to 20 m/s² and shock resistance of 60 m/s² (6g) — suitable for installation on machine-mounted sub-panels or mobile equipment.