The Siemens SIRIUS 3RT1034-3XF40-0LA2 is a size S2 power contactor rated for motor switching at 18.5 kW at 500 V in AC-3 duty, and 15 kW at 400 V in AC-2 duty. It mounts on a 35 mm DIN rail per DIN EN 50022 via screw and snap-on fastening, occupying a 55 mm width. Screw-type terminals on the main current circuit accept stranded conductors up to 25 mm².
Mounting & Integration
Snap-on mounting onto a 35 mm standard mounting rail per DIN EN 50022. Side-by-side mounting is permitted, with clearances of 10 mm upwards, downwards, forwards, and at the side. The 130 mm depth fits standard 200 mm deep enclosures without crowding the wiring duct.
Ratings & Duty
Rated for AC-3 motor switching at 18.5 kW at 500 V and 10 kW at 690 V. The AC-1 resistive load rating supports 1,200 operations per hour maximum; AC-3 duty allows 1,000 ops/h, while AC-4 (plugging/reversing) is limited to 250 ops/h. DC auxiliary contacts are rated 10 A at 24 V, 1 A at 110 V, and 0.3 A at 220 V. Arcing time is 10 to 15 ms; DC switching time is 20 to 30 ms.
Environmental & Compliance
Operating temperature range is -40 to +70 °C; storage range is -55 to +80 °C. The contactor carries a typical mechanical life of 10 million operations.