The Siemens 3RK1301-0KB00-0AA2 is a SIMATIC-branded motor starter, specifically a direct starter design. It handles PROFINET and PROFIBUS DP fieldbus communication, so it slots into a networked control cabinet without a separate gateway.
The CLASS 10 trip class is the headline here: it coordinates with a standard motor's locked-rotor withstand curve, so you don't nuisance-trip on start-up but still get fast protection on a jam. The 50 kA at 400 V rated short-circuit current tells you this unit can be installed on a bus with high fault potential — common in industrial plants with large transformers. It's pluggable on a terminal module, which means the power and control wiring stays in the cabinet when you swap the starter; the fieldbus cables (PROFINET, PROFIBUS DP) also disconnect cleanly. Pollution degree 3 at 400 V means it's rated for conductive dust or light condensation — typical for an unsealed panel in a factory environment.
Mounts vertically or horizontally, which gives flexibility in a crowded cabinet. Fastening is pluggable on a terminal module — think of it as a base plate that carries the power bus and fieldbus backbone; the starter module clicks onto it. The 24 V DC control supply is the standard for modern PLC cabinets; the allowed range is 20.4 to 28.8 V, so it tolerates a weak battery or a long cable run.