The Siemens SIRIUS 3RT2017-2KF42-0LA0 is a size S00 power contactor with a 110 VDC coil and spring-type terminals. It snaps onto a 35 mm DIN rail per DIN EN 60715, occupying a 45 mm wide slot with a 121 mm depth — a standard panel footprint for motor switching up to 10 A at 24 VDC.
What the ratings mean for fit
The 110 VDC coil is the primary selection gate — this contactor pulls in on a DC supply, not AC, so verify your control voltage before wiring. The spring-type terminals accept solid conductors from 0.5 to 4 mm², which covers most control-circuit and small-motor power feeds without lugging. Size S00 means this is the smallest SIRIUS frame, suited for fractional-horsepower motors or resistive loads up to the rated switching capacity. The AC-4 maximum of 250 operations per hour sets the plugging/inching duty limit — exceed that and the contactor life drops fast. Operating temperature spans -40 to +70 °C, so it handles unheated enclosures in cold climates or warm cabinets near drives. Storage tolerance down to -55 °C is a shipping/warehouse spec, not a running condition.
Deployment context
Mounts on a 35 mm DIN rail via screw and snap-on — the screw provides vibration resistance in high-shock panels (conveyor lines, compressor skids). The mounting position is flexible: ±180° rotation on a vertical surface, and tilt up to ±22.5° forward/backward, so it fits angled subpanels or swing frames.