The Siemens 3RK1300-1HS01-1AA4 is an electromechanical reversing starter from the SIRIUS EM 300 RS family, designed for ET 200X distributed I/O environments. It integrates a bimetal motor protection relay with a setting range of 5.5 to 8.0 A, rated for 3 kW at AC-3 duty on a 400 V supply. Operating voltage spans 400 to 500 V AC, and the unit includes an integrated motor brake output rated for DC 500 V / 1 A, intended for internally supplied brakes. The short-circuit breaking capacity at 400 V is 50 A, coordinated with circuit-breakers for Type 2 protection. PROFIBUS DP communication is built in, so the starter connects directly to the fieldbus without an external gateway — a clean fit for Siemens ET 200X or S7-300/400 remote I/O racks.
The housing measures 134 mm deep, 140 mm wide, and 270 mm high. That footprint is larger than a typical contactor-only assembly because the reversing pair, brake contactor, and PROFIBUS electronics are all in one enclosure.