What it is and what it does
The Siemens 3RK1300-1HS01-1AA3 is an electromechanical reversing starter from the EM 300 RS family, designed for the ET 200X distributed I/O system. It combines a reversing contactor, motor protection via bimetal overload relay, and PROFIBUS DP communication in a single IP65-rated enclosure. Rated for 3 kW at AC-3 duty on a 400 V supply, it handles reversing motor loads up to that power — think conveyor direction changes, pump valve actuation, or any application needing forward/reverse control from a single device. The setting range of 5.5 to 8 A lets you dial in the exact full-load current of the motor. The IP65 rating means the entire unit — enclosure, terminals, and PROFIBUS connection — withstands washdown and dust ingress, so it mounts directly on-machine or in harsh environments without a separate cabinet.
Key ratings and what they mean for fit
The AC-3 rating of 3 kW at 400 V is the motor-switching capability under normal starting conditions (up to 8x inrush). The 50 A short-circuit breaking capacity at 400 V means the integrated circuit-breaker-style protection can interrupt a fault up to that level without upstream devices needing to clear it. The bimetal overload relay is adjustable via the 5.5–8 A setting range. Set it to match the motor nameplate FLA. PROFIBUS DP onboard means this starter communicates directly with the ET 200X backplane — no separate gateway or I/O block needed for start/stop and feedback. The brake contact output (rated for internally supplied DC brakes) handles motor holding brakes common in vertical-axis applications. Operating temperature range of 0 to 55 °C covers most industrial floor conditions. Tab terminals on the main circuit accept standard quick-connect receptacles, speeding wiring.
Where it fits
Mounts directly on machine frames or in IP65-rated enclosures via its 270 x 140 x 134 mm (H x W x D) footprint. The 9-pole motor feeder and 9-pole power connection mate with the ET 200X backplane — no additional wiring between starter and I/O head. PROFIBUS DP daisy-chains through the unit.