The Siemens 3RK1300-1ES01-0AA0 is an EM 300 DS direct starter from the SIRIUS family, designed for the ET 200X distributed I/O system. It's an electromechanical direct-on-line starter with a built-in bimetal overload relay, rated for AC-3 duty at 1.5 kW / 400 V with a setting range of 2.8 to 4.0 A. The IP65 enclosure means it's suited for washdown environments or direct machine mounting without a separate panel — think conveyor drives, pumps, or small fans on a production line where you want the starter close to the motor, not back in a central cabinet.
The 1.5 kW rating at AC-3 (400 V) is the motor-switching capacity — that's the load it's designed to start and stop under full-load current. The setting range of 2.8 to 4.0 A on the bimetal relay means the motor full-load current must fall within that window; if your motor draws 3.5 A at full load, this starter is a direct fit. The operating voltage of 400 to 500 V covers standard European 400 V three-phase networks and 480 V North American supplies, though the AC-3 rating is specified at 400 V. The DC control voltage (type of voltage: DC) means the coil is powered by a 24 VDC supply — common in modern PLC-based control systems. The PROFIBUS DP protocol onboard allows direct communication with a Siemens S7-300/400 or ET 200X master, so you get motor status, fault flags, and remote start/stop over the bus without separate control wiring.
Dimensions: 134 mm deep, 140 mm wide, 270 mm high. The tab terminals for the main circuit accept standard 6.3 mm or 4.8 mm tab connectors; the control and bus connections are via the 9-pole motor feeder and 9-pole power connection described in the order code. No separate brake contact output on this variant — if your motor has a brake, you'll need an external brake control module.