The Siemens 3RK1300-1KS01-1AA0 is an electromechanical reversing starter from the SIRIUS EM 300 RS family, designed for distributed motor control in ET 200X environments. It integrates a reversing contactor, bimetal overload relay, and PROFIBUS DP communication into a single IP65 enclosure — meaning it mounts directly on the machine or conveyor section, not back in a central panel. The setting range of 9-12A and AC-3 rating of 5.5kW at 400V tell you it handles reversing duty on three-phase induction motors up to that power class, typical for small conveyors, pumps, or agitators where direction change is part of the cycle.
The 9-12A setting range is the bimetal overload relay's adjustable trip window — you set it to the motor's FLA, not the contactor's make/break capacity. At 12A full-scale, this covers motors drawing up to that current in AC-3 duty (starting and stopping under load). The 5.5kW at 400V figure is the maximum three-phase motor power it can reverse under AC-3 conditions; if your motor is 4kW or 5.5kW, this starter is sized correctly. The operating voltage of 400-500V means the control circuit and bus power derive from the same line voltage range — no separate 24V control supply needed.
IP65 rating means the enclosure withstands washdown and dust ingress — suitable for food-and-bev, packaging, or material handling lines where hosing down equipment is routine. The PROFIBUS DP interface (yes, onboard) lets the starter communicate directly with a PLC over the fieldbus, carrying status, trip, and control signals without hardwired I/O. Main circuit connections are tab terminals, typical for quick-connect wiring in distributed installations. The 140mm width, 270mm height, and 134mm depth define the footprint for panel or machine-mount layout. Ambient operating range of 0-55°C covers most production floor conditions without derating. Note: this variant has no motor brake output — if your application requires a DC injection brake, you need a different suffix.