SIEMENS 3RK1301-0AB10-0AA4 is AS-Interface Slimline compact direct-on-line motor starter, motor current range 0.1~1A, 400V three-phase motor supply, 24VDC control power. DIN rail mounting, IP20 rating, integrated overload and short-circuit protection, ASi bus for signal transmission. It is used for decentralized start-stop control of small asynchronous motors such as conveyors and fans, with status and fault LED indicators, widely used for legacy ASi distributed automation system retrofit and maintenance.