The Siemens SIRIUS 3RT1034-1AK60-1AA0 is a Size S2 power contactor built for motor switching in industrial control panels. It carries a 15 kW rating at 400 V in AC-2 duty (slip-ring motors, reversing starts) and 18.5 kW at 500 V in AC-3 duty (squirrel-cage motors, direct-on-line starts). The screw-type terminals on the main circuit accept stranded conductors up to 25 mm², and the front face is IP20 while the terminal area is IP00 — standard for enclosed panel mounting.
Mounting and integration
Fastens via screw and snap-on onto 35 mm DIN rail per EN 50022. The 55 mm width and 115 mm depth fit standard panel layouts, and side-by-side mounting is allowed — no derating gap required between units. Pollution degree 3 rating means it tolerates conductive dust and humidity typical of industrial enclosures without conformal coating.
Duty cycles and thermal limits
Switching frequency varies by duty class: 1200 cycles/hour in AC-1 (resistive), 1000 in AC-3, 750 in AC-2, and 250 in AC-4 (plugging/inching). The operating range spans 0.8 to 1.1 times rated voltage at both 50 and 60 Hz. Ambient operating temperature is -25 to +60 °C; storage range extends to -55 to +80 °C. Mechanical life is rated at 10 million cycles typical.
Auxiliary contact ratings
Built-in auxiliary contacts handle 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V AC. For DC switching: 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. The AC operate time is 7 to 20 ms with an arcing time of 10 to 15 ms.