What it is and what it does
The Siemens 3RK1300-0GS01-1AA1 is an electromechanical reversing starter from the SIRIUS 3RK1 family, designed for the ET 200X distributed I/O system. It integrates motor starting, reversing, and overload protection in a single IP65 enclosure, rated for direct-on-line reversing of small induction motors up to 0.18 kW at 400 V AC-3 duty. The bimetal overload relay is adjustable from 0.45 A to 0.63 A, matching the full-load current of the motor it protects. The 0.18 kW rating at 400 V AC-3 is the motor power it can switch under typical starting and running conditions — that is the figure to match against your motor nameplate, not the contactor's thermal current. It communicates over PROFIBUS DP, so the reversing commands and feedback status integrate directly into a PROFIBUS network without a separate I/O block. There is no AS-Interface onboard. The unit includes a motor brake output rated DC 24 V / 3 A for externally supplied brakes, which saves a separate brake rectifier or relay in applications like hoists or conveyors that need a holding brake.
Key ratings and what they mean for fit
The operating voltage range is 400... 500 V, so it is suited for 400 V and 480 V three-phase networks common in European and North American industrial plants. The DC 24 V control voltage is standard for PLC-based panels. The short-circuit breaking capacity (Icu) at 400 V is 50 A, meaning the integrated circuit-breaker-type protection can safely interrupt a fault current up to that level. For installations with higher prospective fault current, upstream fusing or a larger breaker is required. The IP65 protection class means the enclosure is dust-tight and protected against water jets — suitable for washdown areas, outdoor cabinets, or environments with coolant mist. The 0... 55 °C operating range covers most factory-floor conditions. Dimensions are 140 mm wide, 270 mm high, and 134 mm deep — a compact footprint for a reversing starter with integrated brake output and PROFIBUS. The tab terminals for the main circuit accept standard fast-on connectors.
Where it is used
This class of part — an IP65 reversing starter with PROFIBUS DP — is deployed in distributed motor control centers, conveyor systems, material handling, and pump stations where the starter must live close to the motor rather than in a central cabinet. The ET 200X form factor means it mounts directly on a machine frame or in a small junction box, saving panel space and wiring.
Sourcing and lifecycle
Because it is an active, standard part, sourcing is straightforward — quote to order against an RFQ, with typical Siemens lead times. No last-time-buy or surplus-channel urgency applies.