What this reversing starter does on a motor branch
The Siemens 3RK1300-0HS01-1AA3 is an electromechanical reversing starter from the SIRIUS EM 300 RS family, designed to control and protect a small three-phase motor in applications that require forward/reverse operation — conveyors, hoists, gate drives, or any reversing load on a 400 V line. Rated at 0.21 kW in AC-3 duty at 400 V, it switches motor loads up to that power level. The bimetal overload relay covers a setting range of 0.55 to 0.8 A, so it is sized for a motor drawing that full-load current — verify the motor nameplate FLA falls within that window before committing the BOM line. The IP65 enclosure means the unit is dust-tight and protected against low-pressure water jets — suitable for washdown areas, outdoor cabinets, or food-and-beverage zones where hose-down is routine. No separate enclosure needed for the starter itself. PROFIBUS DP is built in, so the starter communicates directly with a PLC or higher-level controller over the fieldbus without an extra gateway module. The integrated motor brake output (product component Motor brake output = Yes) handles an internally supplied DC brake, saving a separate brake contactor.
Panel integration and wiring
Dimensions: 270 mm high x 140 mm wide x 134 mm deep. The main current circuit connects via tab terminals — expect blade-type receptacles, not screw clamps. The 9-pole motor feeder and 9-pole power connection are part of the assembly, so the wiring plan should account for those multi-pin interfaces rather than individual lug terminations. Operating ambient temperature range is 0 to 55 °C. The unit carries equipment marking Q per DIN EN 61346-2, which classifies it as a power switching device in the panel schematic.
Short-circuit protection and breaking capacity
Short-circuit protection is designed around circuit-breakers (not fuses) per the product design. The maximum short-circuit breaking capacity (Icu) at 400 V is 50 A — this is the fault current the starter can safely interrupt without damage upstream. For a panel with a higher available fault current, the upstream breaker or fuse must limit the let-through to 50 A or less.