Siemens 3RT2018-1AK61-0UA0 is a SIRIUS power contactor in frame size S00. It mounts via screw and snap-on onto 35 mm DIN rail per EN 60715, with generous positioning flexibility: +/-180° rotation on a vertical surface and +/-22.5° tilt angle. The screw terminals accept solid or stranded wire from 0.5 to 4 mm². An integral auxiliary switch is included, so that slot stays free for other gear.
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This exact order code is a standard catalog line. Quoted to order against an RFQ — if your BOM calls for a size S00 contactor with screw terminals and an onboard auxiliary, this is a direct line-fit that doesn't waste panel space.