What it is and what it does
The Siemens SIRIUS 3RT2036-1NB30-0CC0 is a power contactor in the S2 frame size, designed for switching motor loads and resistive loads in industrial control panels. It carries a 20-33 VDC coil rated for continuous duty, with a pick-up tolerance of 0.8 to 1.1 times the rated value, meaning the coil reliably pulls in at 16 V and holds in up to 36.3 V. The coil draws 2 VA at both 50 Hz and 60 Hz, with an inrush current peak of 3 A. The main contacts are 3-pole normally open (18...1 configuration), and the contactor includes a factory-fitted auxiliary switch (1 NO + 1 NC) with ratings of 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, and 0.3 A at 220 V — all resistive. This auxiliary switch is wired via screw-type terminals, matching the main coil terminals.
Mounting and integration
Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715. The mounting position allows +/-180° rotation on a vertical surface and can be tilted forward/backward by +/-22.5° on a vertical surface — useful when the contactor must sit at an angle in a tight enclosure. Clearance distances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the sides. Dimensions are 55 mm wide, 114 mm high, and 130 mm deep, so it occupies a standard S2 footprint on the rail. Wire cross-section for main and auxiliary terminals accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. The contactor is rated for 10 million mechanical operations typical.
Switching performance and duty cycles
Maximum operating frequency varies by duty class: 1,000 operations per hour for AC-1 (resistive), 600/h for AC-2 (slip-ring motor), 800/h for AC-3 and AC-3e (squirrel-cage motor starting), and 250/h for AC-4 (plugging/inching). Opening and closing times are 30-55 ms for both AC and DC operation; arcing time is 10-20 ms. These figures matter for coordinating with upstream protection and for applications requiring frequent switching — AC-4 duty at 250/h is the limiting case for high-inertia loads.