The Siemens 3RK1300-0DS01-1AA0 is an electromechanical reversing starter from the EM 300 RS family, designed for the ET 200X distributed I/O system. It combines a reversing contactor pair, bimetal overload protection, and PROFIBUS DP communication in one IP65 enclosure — meaning it mounts directly on the machine frame or conveyor section, not in a central panel. The setting range of 0.22 to 0.32 A covers small motors up to 0.09 kW at AC-3 duty (400 V), so it handles fractional-horsepower reversing loads like flap actuators, diverters, or small conveyor drives. Rated operating voltage is 400 to 500 V, with a maximum short-circuit breaking capacity of 50 A at 400 V. The bimetal overload relay provides motor protection; the electromechanical switching contacts handle the reversing logic.
PROFIBUS DP onboard — no gateway needed
This starter includes PROFIBUS DP protocol natively, so it connects directly to a PROFIBUS DP master without an external gateway or coupler. The bus communication function means start, stop, reverse, and fault feedback travel over the network — no hardwired control wires from the PLC. For an ET 200X island, this consolidates reversing motor control into the distributed I/O rack, saving cabinet space and reducing point-to-point cabling.
IP65 and the washdown reality
This starter is suited for food-and-bev washdown zones, outdoor conveyor sections, or any area where hose-down cleaning is routine. The operating temperature range of 0 to 55 °C covers most production-floor environments but not freezer applications — below 0 °C the bimetal trip curve shifts, so don't spec it for cold storage.