SIMATIC motor starter for direct-on-line control
The Siemens 3RK1301-0AB10-0AA3 is a SIMATIC-branded motor starter in a direct starter design, rated for 24 V DC control supply (20.4 to 28.8 V permissible range). It integrates PROFINET and PROFIBUS DP fieldbus protocols, making it a networked motor control node for a distributed automation architecture — not a standalone contactor. The adjustable trip class (CLASS 10 and 20) lets you match the overload protection curve to the motor's starting profile: Class 10 for faster starts like fans or pumps, Class 20 for higher-inertia loads such as conveyors or crushers. That adjustability is the key differentiator from a fixed-class starter — it gives the commissioning engineer one SKU that covers both duty cycles without swapping thermal elements. The 50 kA rating is the withstand level at the motor starter's terminals — critical for panel builders sizing the SCCR on the nameplate.
The unit mounts via a pluggable connection onto a terminal module — not directly on DIN rail. That means the base terminal module is installed and wired first; the starter module itself snaps on and off for swap-out without disturbing the power wiring. Panel builders should account for the 150 mm depth, 65 mm width, and 290 mm height when laying out the enclosure backplate. Mounting position is vertical or horizontal, giving layout flexibility in tight cabinets. Shock resistance is 5g at 11 ms, vibration resistance 2g — sufficient for most industrial floor and conveyor-adjacent installations.
I/O and fieldbus connectivity
The starter provides 2 bytes of process input data and 2 bytes of process output data over the fieldbus — enough for start/stop, direction (though reverse starting is not supported on this variant), and status feedback. Two digital inputs are available via the control module for local pushbuttons or limit switches. No brake control outputs (24 V DC, 180 V DC, 230 V AC, or 500 V DC) are fitted on this unit. PROFINET and PROFIBUS DP are both supported, so the starter can drop into either a Siemens S7-1500 PROFINET island or a legacy PROFIBUS DP line without a gateway. The maximum operating frequency is 750 switching cycles per hour — adequate for most motor starting duty, but not for high-speed jogging or reversing applications.