What this reversing starter is and where it fits
The Siemens 3RK1300-1AS01-1AA3 is an electromechanical reversing starter from the SIRIUS EM 300 RS family, designed for the ET 200X distributed I/O system. It combines a reversing contactor pair, bimetal overload relay, and PROFIBUS DP communication in a single IP65 enclosure — so it mounts directly on the machine frame or in a washdown zone, not inside a central cabinet.
Key ratings and what they mean for fit
Rated 0.55 kW at AC-3 duty on 400... 500 V supply. The setting range of 1.1...1.6 A via the bimetal overload matches small three-phase motors in that power band — think conveyors, small pumps, or reversing drives up to about 0.55 kW. The 50 A short-circuit breaking capacity (Icu at 400 V) means the starter can clear a fault up to that level without upstream fuses needing to open first, which simplifies coordination in a 50 A-or-less branch. The IP65 protection class means the housing and all connections tolerate direct hose-down and dust ingress — it is built for food-and-beverage lines, car wash tunnels, or any location where the starter sits in the process area rather than a clean panel.
Communication and brake handling
PROFIBUS DP is onboard as standard — no separate gateway module needed. The starter also includes a motor brake output, so it can control an externally supplied DC brake directly. The 9-pole motor feeder and 9-pole power connection handle both the motor leads and the brake wiring in one cable, reducing field wiring time.