The Siemens SIRIUS 3RT1035-3XB40-0LA2 is a size S2 power contactor rated to switch a 22 kW motor at 500 V in AC-3 duty — the rating that matters for standard three-phase induction motor loads. The 24 VDC coil pulls in at 0.7 of rated voltage and holds with a typical dropout below 18 V. Screw-type terminals on the main circuit accept up to 16 mm² stranded wire, and the auxiliary circuit takes 2.5 mm² solid. Mounts via screw or snap-on onto 35 mm DIN rail per EN 50022.
Mounting and integration
Side-by-side mounting is permitted without derating, saving rail space in dense panels. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm at the side, 10 mm downwards — standard for the S2 frame. The 55 mm width and 142 mm height fit a typical 35 mm DIN-rail footprint.
Environmental and mechanical
Operating temperature range spans -40 to +70 °C, storage from -55 to +80 °C — suitable for unconditioned enclosures in most industrial environments. Mechanical endurance is rated at 10 million operating cycles typical.