What this SIMATIC direct starter is
The Siemens 3RK1301-0CB20-0AA4 is a SIMATIC-brand motor starter for direct-on-line starting of three-phase induction motors. It's a current-production part (lifecycle stage: current) that combines a contactor, overload relay, and PROFINET communication into one pluggable unit that mounts on a terminal module. Rated 7.5 kW at 400 V AC, 50 Hz, with a Trip Class that's adjustable between CLASS 10 and CLASS 10A — meaning it can be set to trip faster for motors that need tighter thermal protection, like those driving pumps or compressors on a lube route.
Supply voltage is 24 V DC for the control electronics (range 20.4 to 28.8 V), with the power circuit taking 200 to 440 V AC at 50 Hz. The 24 V DC control side is standard for industrial panels — keeps the SELV loop separate from the motor power. IP20 protection means it's for inside a cabinet, not out on the plant floor where washdown happens.
Mounts by plugging onto a terminal module. Dimensions: 290 mm high, 65 mm wide, 150 mm deep.
Shock resistance: 5g for 11 ms. Vibration resistance: 2g.