What it is and where it fits
The Siemens 3RK1300-1DS01-0AA0 is an EM 300 DS direct starter designed for the ET 200X distributed I/O system — an electromechanical motor starter that combines a contactor, overload relay, and short-circuit protection in one IP65-rated enclosure for mounting directly on the machine, not back in the panel. It's rated for AC-3 duty at 1.1 kW on a 400 V supply, with a current setting range of 2.2 to 3.2 A via a bimetal overload relay, and carries a maximum short-circuit breaking capacity of 50 A at 400 V. The IP65 rating means the enclosure and connections withstand hose-directed water and dust ingress, so it's suited for washdown zones in food-and-bev or chemical processing lines where a panel-mounted starter would be impractical.
Communication and integration
This starter communicates over PROFIBUS DP, letting the ET 200X remote I/O head handle start/stop commands and fault feedback without running individual control wires back to the PLC cabinet. The main current circuit connects via tab terminals — no screw terminals on the power side, so verify your motor feeder cable ends match before installation. Dimensions are 140 mm wide, 270 mm high, and 134 mm deep — sized to the ET 200X modular block format, so it clips onto the same mounting rail and aligns with the bus connectors of adjacent modules.
Lifecycle and sourcing posture
For a BOM freeze or a replacement on a live line, this part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.
What the ratings mean for your choice
The 2.2 to 3.2 A setting range covers small three-phase motors (up to 1.1 kW at 400 V) — the bimetal overload tracks motor heating, so set it to the motor nameplate FLA, not the starter's maximum. The 50 A short-circuit breaking capacity at 400 V means the integrated circuit-breaker-type protection can interrupt a fault up to that level without relying on an upstream fuse — coordination with the branch circuit still needs verification per IEC 60947-4-1. Operating ambient temperature is 0 to 55 °C, so it's fine inside a non-conditioned enclosure on the plant floor but not for freezer or outdoor direct-sun applications.