The Siemens 3RA6250-1CB32 is a SIRIUS compact reversing starter — a single device that combines a reversing contactor and a thermal overload relay in one 90 mm wide package. It's rated for 1.5 kW at 400 V and carries a 53 kA breaking capacity at 400 V, so it handles motor faults without the upstream breaker needing to clear them. The trip class is adjustable between Class 10 and Class 20, which means you set it for the motor's starting characteristic — faster for pumps, slower for high-inertia loads like fans or conveyors.
At 90 mm wide, 170 mm tall, and 165 mm deep, it fits a standard motor starter slot in a SIRIUS lineup. The screw-type terminals on the main circuit accept solid wire from 0.5 to 4 mm², or two conductors of 0.5 to 2.5 mm² — enough for the motor leads on a 1.5 kW drive.
Tough Enough for the Route
Out here in the grease, gear takes a beating. This starter is rated for continuous operation per IEC 60947-6-2, and it's built to handle the vibration on a motor circuit — tested at 4 to 5.8 Hz with 15 mm displacement, and up to 500 Hz at 20 m/s². Shock resistance is 60 m/s² (6g) for 10 ms in all axes. That means it'll live on a conveyor line or a pump skid without crapping out.