What this reversing starter delivers in a distributed line
The Siemens 3RK1300-0CS01-1AA0 is an electromechanical reversing starter from the EM 300 RS family, designed for the ET 200X distributed I/O system. It integrates motor starting, reversing, and bimetal overload protection in a single IP65-rated enclosure — meaning it mounts directly on the machine or conveyor section, not back in a central panel. The 0.18 to 0.25 A setting range covers small AC-3 motor loads up to 0.06 kW at 400 V. PROFIBUS DP is onboard, so the starter communicates directly with the controller over the fieldbus without a separate gateway. The 9-pole motor feeder and 9-pole power connection mate via tab terminals, which keeps field wiring consistent with the ET 200X connector scheme.
Sizing and protection — what the ratings mean for your BOM
The 0.06 kW rating at AC-3 (400 V) is the motor switching capacity under standard starting conditions — that is the figure to match against your motor nameplate, not the thermal setting range. The bimetal overload relay inside is adjustable from 0.18 to 0.25 A, so it protects a motor drawing that full-load current. The 50 A maximum short-circuit breaking capacity (Icu) at 400 V means the integrated circuit-breaker-style short-circuit protection can safely interrupt a fault up to that level without upstream devices needing to clear it. Operating voltage is 400 to 500 V AC, three-phase. The ambient temperature range of 0 to 55 °C during operation covers most industrial floor conditions without derating.
Mounting and integration notes
The IP65 enclosure (134 mm deep, 140 mm wide, 270 mm tall) is rated for washdown environments — suitable for food-and-bev or wet-area deployment where a central panel would be impractical. Mounts via the ET 200X backplane or direct screw fixing. The tab terminals for the main current circuit accept standard fast-on connectors; no screw-clamp torqueing needed on the power side. No motor brake output is included on this variant — if your application requires a brake contact, select the -1AA1 suffix version instead. The equipment marking per DIN EN 61346-2 is Q (power switching device).