Siemens DOL Starter, std mechanical switching, 0.9kWProduct Overview The 3RK1304 5KS40 4AA0 is an ET 200pro DSE ST direct on line (DOL) starter designed for standard industrial motor control applications. This compact motor starter features mechanical switching with electronic overload protection, rated for AC 3 duty at 0. 9 kW 400 V with an adjustable current range of 0. 15 A to 2. 00 A. The unit provides reliable motor protection without brake contact and integrates seamlessly with the SIMATIC ET