What It Is and Where It Fits
The Siemens SIRIUS 3RT2035-1AD04 is a power contactor in the S2 frame size, designed for switching motor loads and resistive loads in industrial control panels. It mounts on a 35 mm DIN rail per DIN EN 60715, using either screws or the integrated snap-on clip, and accepts screw-type terminals for the magnet coil. At 55 mm wide and 174 mm deep, it occupies a standard S2 footprint — the same width as the 3RT2027 frame but deeper, so a panel laid out for the smaller contactor may need clearance for the extra 20 mm or so behind the DIN rail. The contactor is rated for continuous duty in ambient temperatures from -25 °C to +60 °C and can be stored from -55 °C to +80 °C. Mounting position is flexible: ±180° rotation on a vertical surface, with ±22.5° tilt forward or backward.
Switching Performance and Duty Ratings
The 3RT2035-1AD04 is rated for 1 200 operations per hour in AC-1 (resistive) duty, 1 000 ops/h in AC-3 (squirrel-cage motor starting), and 300 ops/h in AC-4 (plugging/inching). The AC-3e rating matches the standard AC-3 at 1 000 ops/h. These are the maximum mechanical switching rates — actual thermal limits depend on the load current and enclosure derating. Arcing time is 10 to 20 ms, and operate time at AC is 10 to 18 ms. Main contacts are rated for 18 to 1. Mechanical life is typical 10 000 000 operations.
Coil and Auxiliary Details
The magnet coil uses screw-type terminals, accepting solid or stranded wire: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). No auxiliary switch is integrated on this base unit — add a separate auxiliary contact block if needed. Coil ratings at various control voltages: 6 A at 24 V rated value, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, 0.6 A at 440 V, 40 A at 480 V, 2 A at 500 V. At 50 Hz the coil is rated for 42 V. At 230 V rated value, the contactor carries 7.5 hp.