The Siemens 3RK1301-0BB10-1AB4 is a SIMATIC-brand reversing motor starter designed for 24 V DC control voltage. It integrates both PROFINET and PROFIBUS DP fieldbus interfaces, so it fits into either a Siemens S7-based line or a mixed-protocol panel without a separate gateway. The trip class is selectable among 5, 10, 15, or 20, which means you match the overload protection to the motor's thermal time constant — Class 10 for standard induction motors, Class 20 for high-inertia loads like fans or centrifuges.
SCCR and duty ratings
The unit carries a 50 kA short-circuit current rating at 400 V. The pollution degree is rated 3 at 400 V and 2 at 500 V per IEC 60664 / IEC 61131, so for a 400 V panel in a dirty environment (factory floor, not a clean room) the creepage distances are already accounted for.
Mounting is pluggable onto a terminal module, meaning the power and control wiring stays in the panel while the starter module itself can be swapped without pulling wires. Accepts both vertical and horizontal mounting positions. Dimensions are 150 mm deep, 130 mm wide, 290 mm tall — fits a standard 300 mm deep enclosure. The main energy infeed uses screw-type terminals; the energy bus handles power distribution between modules.