The Siemens 3RK1300-1HS01-1AA0 is an EM 300 RS electromechanical reversing starter designed for the ET 200X distributed I/O family. It integrates a reversing contactor pair, bimetal motor protection, and PROFIBUS DP communication into a single IP65-rated enclosure, making it a drop-in motor control solution for decentralized applications.
What the Ratings Mean for Fit
The AC-3 rating of 3 kW at 400 V (setting range 5.5-8 A) defines its motor-switching capability under IEC 60947-4-1. AC-3 covers starting and plugging of squirrel-cage motors, so this starter handles reversing duty on motors up to 3 kW. The 5.5-8 A setting range on the bimetal overload relay allows fine-tuning to the motor FLA within that window. The 50 A maximum short-circuit breaking capacity (Icu) at 400 V means the integrated short-circuit protection (circuit-breaker design) can safely interrupt faults up to that level without cascading upstream — critical for selectivity in a distributed panel. IP65 protection means the enclosure withstands hose-directed water and dust ingress — suitable for washdown zones or outdoor installation without a separate cabinet. The 0-55 °C operating range covers most plant-floor environments but derate if mounted in a sealed enclosure near other heat sources. PROFIBUS DP protocol support (yes) means this starter communicates directly on a PROFIBUS network, eliminating a separate I/O block for reversing commands. The 9-pole motor feeder and 9-pole power connection (tab terminals) match the ET 200X connector system — verify cable gland sizing for the 134 mm depth and 140 mm width in your enclosure layout.
Where It's Used
This reversing starter is deployed in decentralized motor control centers for conveyors, hoists, and other bidirectional drives. The ET 200X form factor places the starter close to the motor, reducing power cabling. The PROFIBUS DP interface pulls direction commands from the PLC without hardwired interlocks.