What this part is and where it lands
The Siemens 3RK1300-1JS01-0AA4 is an electromechanical direct starter from the SIRUS EM 300 DS family, designed for the ET 200X distributed I/O system. It switches motor loads up to 4 kW at AC-3 duty on a 400 V supply, with a setting range of 7.0 to 10 A via a bimetal overload relay. The IP65 enclosure means it can be mounted directly on-machine or in a washdown zone without a separate panel — the housing and optics withstand hose-directed water and dust ingress.
Key ratings and what they mean for fit
Rated 4 kW at AC-3 400 V — that's the motor-switching current under full load, not the resistive heating value. The 7.0 to 10 A setting range covers common 3-phase induction motors in that power band; the bimetal thermal element tracks motor heating and trips on sustained overload. Short-circuit protection is handled by circuit-breakers coordinated upstream, with a maximum breaking capacity (Icu) of 50 A at 400 V — that's the fault current the device can safely interrupt without welding contacts or cascading damage. Operating voltage is 400 to 500 V AC, so it covers standard 400 V line supplies in Europe and 480 V North American systems. The DC control voltage type means the coil is DC-powered — verify your control supply is DC before wiring. Ambient temperature range of 0 to 55 °C covers most industrial floor conditions without derating.
Bus communication and brake output
PROFIBUS DP onboard — this starter communicates directly with a PLC over the fieldbus, so you get remote start/stop, fault readback, and parameterization without hardwired I/O. No AS-Interface protocol here; the bus is PROFIBUS only. The integrated motor brake output (DC 500 V / 1 A) handles internally supplied brakes — common on holding brakes for vertical-axis motors or conveyors that need to lock on power loss. The 9-pole motor feeder and 9-pole power connection mate to the ET 200X backplane via tab terminals.
Physical integration
Dimensions: 270 mm high, 140 mm wide, 134 mm deep. The IP65 housing allows standalone mounting on a machine frame or in a junction box — no DIN-rail enclosure needed. Tab terminals for the main current circuit accept standard fast-on connectors; the 9-pole motor feeder and power connection plug into the ET 200X backplane. Mounting position is vertical; the enclosure is designed for the distributed I/O environment, not a central panel.