The Siemens 3RK1300-0DS01-1AA1 is an electromechanical reversing starter from the SIRIUS EM 300 RS family, designed for ET 200X distributed I/O environments. It integrates a reversing contactor pair with bimetal overload protection, a motor brake output, and PROFIBUS DP communication into a single IP65-rated enclosure. Rated for 0.09 kW at AC-3 duty class on a 400 V supply, the setting range spans 0.22 A to 0.32 A for the bimetal overload relay. This makes it suited for small three-phase motors — fractional-horsepower pumps, fans, or conveyor drives — where reversing capability and motor protection are needed in one package. The operating voltage range is 400 to 500 V AC, and the unit carries a maximum short-circuit breaking capacity (Icu) of 50 A at 400 V. The main current circuit connects via tab terminals, typical for the ET 200X plug-in system.
Fieldbus integration and brake control
PROFIBUS DP protocol is built in, so the starter communicates directly with a PLC over the fieldbus without a separate gateway module. The product function for bus communication is enabled, meaning parameterization and diagnostics travel over the same network cable. A motor brake output is included — a DC 24 V / 3 A contact for externally supplied brakes. This is the feature that distinguishes this variant: if your motor has a holding brake that needs a separate DC supply, this starter handles the switching without an extra interposing relay.
Enclosure and mounting
The IP65 protection class means the enclosure is dust-tight and protected against water jets — suitable for washdown areas or outdoor installation without a separate cabinet. Dimensions are 134 mm deep, 140 mm wide, and 270 mm high. It mounts directly in the ET 200X distributed system, so the 9-pole motor feeder and 9-pole power connection mate with the backplane bus. No additional DIN-rail or panel footprint is needed beyond the system slot it occupies.