Motor Starter with Integrated Safety and Fieldbus
The Siemens SIMATIC 3RK1301-0CB13-0AA2 is a direct motor starter designed for integration into automated control systems. It supports both PROFINET and PROFIBUS DP protocols, making it suitable for modern and legacy fieldbus architectures. The unit provides 2 bytes of input and 2 bytes of output data, with 2 digital inputs available via a control module. It is a direct starter, not a reversing starter, and does not include brake control. Rated for a 24 V DC supply (21.6 to 26.4 V DC rated, 20.4 V minimum, 28.8 V maximum), the starter is pluggable onto a terminal module for mounting in vertical or horizontal positions.
Trip Class and Fault Current Rating
The adjustable trip class (CLASS 10 and 20) allows matching the overload protection to the motor's thermal characteristics. Class 10 is for motors with short acceleration times; Class 20 accommodates longer start-up periods, such as high-inertia loads. With a rated short-circuit making capacity of 50 kA at 400 V, this starter can handle high fault currents without upstream fuses or breakers needing to clear first. Pollution degree 3 at 400 V and degree 2 at 500 V per IEC 60664 and IEC 61131 define the environmental robustness for the installation. The safe state is load circuit open, and the maximum operating frequency is 80 cycles per hour, which limits how often the starter can be cycled under load.
Reliability and Environmental Ratings
Mean Time Between Failures (MTBF) is listed at 14 years, and the Mean Time To dangerous Failure (MTTFd) is 31 years, indicating the reliability profile for both standard and safety-related operation. The unit withstands vibration at 2g and shock at 5g for 11 ms, suitable for industrial environments with moderate mechanical stress. Dimensions are 290 mm height, 150 mm depth, and 65 mm width, fitting standard panel layouts for motor control centers.
No official successor or replacement is indicated in the lifecycle record. For BOM continuity, the part can be specified into new designs with confidence in ongoing supply.