The Siemens 3RT2017-2LF42-1LA0 is a SIRIUS power contactor in the compact Size S00 frame (45 mm wide, 70 mm tall, 121 mm deep). The DC coil holds at 110 V nominal; the rated control supply voltage is DC, so verify your control circuit provides clean DC before committing this part to the BOM. The spring-type terminals (push-in or cage-clamp style) reduce wiring time compared to screw terminals and stay secure under vibration — a real advantage on a conveyor line or compressor skid. Contact ratings span the full AC-3 motor switching curve: 11 A at 480 V and 11 A at 600 V, making it suitable for 3 hp at 230 V and for motor loads up to roughly 5.5 kW at 400 V. The DC switching ratings are lower — 10 A at 24 V, 1 A at 110 V, 0.3 A at 220 V — so if this contactor feeds a DC load, derate accordingly.
Mounting and Integration — Panel Fit
The Size S00 footprint (45 mm wide) is the smallest Siemens contactor frame, so it fits tightly spaced rail assemblies.