What it is and what it does
The Siemens SIMATIC 3RK1301-0BB00-1AA2 is a reversing motor starter — a single package that handles forward and reverse direction control for a three-phase motor, without needing a separate contactor pair and interlock wiring. It is designed for motor starting duty with a CLASS 10 trip characteristic, meaning it will trip within 10 seconds at 600% of the set overload current, protecting standard induction motors during start-up. The unit accepts a 24 V DC control supply (rated 20.4…28.8 V) and includes both PROFINET and PROFIBUS DP fieldbus interfaces, so it can be integrated into a SIMATIC IO system or any open controller supporting those protocols.
Key ratings and what they mean for fit
Rated short-circuit current at 400 V is 50 kA. CLASS 10 trip characteristic is built in. Reversing function is integrated.