SIRIUS S2 power contactor — 3RT2036-1AC20-ZX95
The Siemens SIRIUS 3RT2036-1AC20-ZX95 is a Size S2 power contactor rated for motor switching up to 52 A at 480 V and 10 hp at 230 V, with a 24 V 50 Hz coil and screw-type terminals. It includes an integrated auxiliary switch and mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, with a footprint of 55 mm wide by 114 mm high by 130 mm deep. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, giving flexibility in tight panel layouts.
What the ratings mean for your panel
The 52 A at 480 V rating is the AC-3 motor-switching current — the figure that governs whether this contactor handles your motor load without derating. For resistive loads (AC-1), the contactor can cycle at up to 1000 operations per hour, while AC-3 motor duty allows 800 ops/h and the severe AC-4 inching/plugging duty is limited to 250 ops/h. Screw-type terminals accept 2x (0.5 to 1.5 mm²) solid or stranded and 2x (0.75 to 2.5 mm²) — sized for the control wiring typical on a 24 V coil circuit drawing 0.36 A at 50 Hz or 0.39 A at 60 Hz. Operating temperature range of -25 to +60 °C covers most indoor panel environments; storage range of -55 to +80 °C is for spares holding. The mechanical life of 10 million operations means this contactor outlasts most equipment it will switch.
Clearance and wiring note
Minimum clearances around the contactor: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. These are the ventilation and arc-flash gaps — respect them in the panel layout to avoid derating or nuisance tripping. Arcing time is 10 to 20 ms, and the main contact sequence is 18 normally open to 1 normally closed.