The Siemens SIRIUS 3RT1036-1AQ20 is a size S2 power contactor rated for 22 kW AC-2 at 400 V and 30 kW AC-3 at 500 V, with a 690 V AC-3 rating of 11.4 kW. It uses screw-type terminals on the main circuit and mounts via screw and snap-on onto 35 mm DIN rail per EN 50022 — standard panel integration for a motor control center or standalone enclosure.
Ratings and what they mean for fit
AC-2 at 400 V: 22 kW — this is the rating for slip-ring motor starting, where the contactor makes and breaks the rotor circuit under load. AC-3 at 500 V: 30 kW — the standard squirrel-cage motor start/run rating, covering the majority of fixed-speed pump, fan, and conveyor loads. AC-3 at 690 V: 11.4 kW — derated for higher voltage; use this figure if your line voltage is 690 V three-phase. Auxiliary contact ratings: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V — sufficient for pilot-duty control circuits, PLC inputs, or contactor feedback. Mechanical life is 10 million operations; electrical life depends on the duty cycle (AC-1 max 1000 ops/h, AC-3 max 800 ops/h, AC-4 max 300 ops/h). Pollution degree 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation) — expect this in industrial environments; no additional conformal coating required for normal panel conditions. Operating temperature -25 to +60 °C; storage -55 to +80 °C. The storage range is wider — handling, not running, is what that limit governs.
Mounting and wiring
Snap-on onto 35 mm DIN rail per EN 50022; side-by-side mounting is permitted without derating (no gap required). Dimensions: 55 mm wide, 112 mm high, 115 mm deep — fits standard S2 contactor footprint. Screw terminals on the main circuit accept solid wire 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²); stranded wire 2x (0.75 to 25 mm²). The auxiliary circuit terminals accept 2x (0.75 to 16 mm²) solid or stranded. IP20 on the front, IP00 at the terminals — the terminal area is not finger-safe; use terminal shrouds or a covered enclosure.