What this part is and what it does
The Siemens 3RK1300-1GS01-0AA3 is an EM 300 DS electromechanical direct starter designed for the ET 200X distributed I/O system. It integrates a contactor, bimetal overload relay, and short-circuit protection into a single IP65-rated enclosure, so it lives directly on the machine frame rather than in a central panel. The setting range of 4.5 to 6.3 A covers small motor loads up to 2.2 kW at 400 V in AC-3 duty — that's the standard switching category for squirrel-cage induction motors during starting and running. The 50 A short-circuit breaking capacity at 400 V means the unit can interrupt a fault up to that level without relying on an upstream breaker to clear it first. Operating voltage is 400 to 500 V AC, and the unit includes a motor brake output for internally supplied brakes, which saves an external brake rectifier on the motor feeder.
PROFIBUS DP and bus communication
This starter communicates over PROFIBUS DP, so it plugs into the ET 200X backplane and reports status — overload trip, motor current, brake feedback — back to the controller without separate control wiring. The 9-pole motor feeder and 9-pole power connection handle both the motor power and the brake circuit through a single cable drop. The IP65 rating means the electronics and contacts are sealed against dust ingress and low-pressure water jets. Mount it on the machine frame or in a washdown zone; no separate enclosure needed.
Lifecycle and sourcing reality
For a BOM line that calls out 3RK1300-1GS01-0AA3, the fit is confirmed by the setting range (4.5-6.3 A) and the AC-3 motor rating (2.2 kW at 400 V). The part is sourced to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.