Siemens SIRIUS 3RT1035-3BF46 — Power Contactor, Size S2
The Siemens SIRIUS 3RT1035-3BF46 is a size S2 power contactor rated for motor switching up to 22 kW at 500 V in AC-3 duty, and 18.5 kW at 400 V in AC-2 duty. The coil is 110 VAC 50/60 Hz. Screw-type terminals on the main circuit accept stranded wire up to 2x 25 mm².
Mounting and Integration
Mounts on 35 mm DIN rail per EN 50022 with screw or snap-on fastening. The S2 footprint is 75 mm wide, 112 mm tall, 130 mm deep. Side-by-side mounting is supported with no derating gap required. Front face is IP20; the terminal area is IP00 — plan for finger-safe covers if the contactor sits near the panel door.
Ratings and Duty Cycles
AC-3 switching rate maxes at 1 000 operations per hour; AC-4 (plugging/reversing) at 300 per hour. Mechanical life is 10 million cycles typical. Pollution degree 3 suits industrial environments. Operating temperature range is -25 to +60 °C; storage from -55 to +80 °C.
Auxiliary Contact Ratings
Built-in auxiliary contacts handle 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V. Pick-up voltage is 0.8 x nominal; drop-out is 1.1 x nominal. Operating time at DC is 20 to 25 ms, with arcing time of 10 to 15 ms.