What this part is and where it fits
The Siemens 3RK1300-0ES01-0AA0 is an EM 300 DS electromechanical direct starter designed for the ET 200X distributed I/O system. It combines a contactor and a bimetal motor protection relay in one IP65-rated enclosure, rated for 0.1 kW at 400 V in AC-3 duty, with a setting range of 0.28 to 0.4 A. The IP65 rating means the housing and connections withstand washdown — suitable for food-and-bev or wet-area deployment right on the machine, not back in a clean panel. It communicates over PROFIBUS DP, so it integrates directly into a Siemens ET 200X station as a motor starter slice. The 9-pole motor feeder and 9-pole power connection handle both the power and feedback wiring through tab terminals.
Motor protection and ratings
The bimetal overload relay is set at the factory range of 0.28 to 0.4 A, covering small motors like fractional-horsepower conveyors or agitators. The AC-3 rating at 400 V is 0.1 kW, which is the switching capacity for squirrel-cage motors during starting and plugging — the duty that matters for most industrial motor starts. The operating voltage range is 400 to 500 V, so it works on 400 V and 480 V line supplies common in North American and European plants. Short-circuit protection is designed for use with circuit-breakers, not fuses, and the maximum short-circuit breaking capacity (Icu) at 400 V is 50 A. That means the starter can safely interrupt a fault up to 50 A without upstream devices needing to clear it first — a coordination figure the panel builder needs for selectivity studies.
Dimensions and panel integration
The housing measures 270 mm high, 140 mm wide, and 134 mm deep. It mounts directly onto the ET 200X backplane, so no separate DIN-rail footprint is needed — the starter becomes part of the distributed I/O node. The 9-pole motor feeder and 9-pole power connection use tab terminals, which mate with the corresponding ET 200X power distribution module.