What it is and what it does
The Siemens SIRIUS 3RT2036-1AM20-0UA0 is a size S2 power contactor rated for 52 A at 480 V, with a 208 V 50 Hz coil. It is designed for switching motor loads and resistive loads in industrial control panels, with screw-type terminals for the magnet coil and main contacts. The 52 A rating at 480 V means this contactor can handle motor loads up to that current in AC-3 duty — the standard category for squirrel-cage motors during starting and switching off under load. For resistive loads (AC-1), the switching frequency can go up to 1000 operations per hour; for AC-3 motor duty, 800 ops/h is the maximum. It mounts via screw fixing or snaps onto a 35 mm DIN rail per DIN EN 60715, fitting into standard panel layouts. The mounting position allows +/-180° rotation on a vertical surface and +/-22.5° tilt forward/backward, giving flexibility in tight enclosures.
Panel integration and wiring
Dimensions are 55 mm wide, 114 mm high, and 130 mm deep — a compact S2 footprint that leaves room for adjacent devices on the DIN rail. Clearance spacing: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. Terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire. The screw-type coil terminals are standard for panel wiring — no special tooling needed. An auxiliary switch is included (18 to 1 configuration for main contacts), reducing the need for a separate add-on block in many simple motor starter circuits.
Lifecycle and sourcing reality
Operating temperature range is -25 to +60 °C during operation, with storage from -55 to +80 °C. Mechanical life is rated at 10 million operations typical, giving a long service interval for most applications.
Key ratings at a glance
Coil draws 0.36 A at 50 Hz and 0.39 A at 60 Hz. Switching times: AC operate time 10 to 18 ms, arcing time 10 to 20 ms. Maximum switching frequency varies by duty: 1000 ops/h AC-1, 800 ops/h AC-3 and AC-3e, 600 ops/h AC-2, 250 ops/h AC-4. Auxiliary contact ratings: 10 A at 24 V, 2 A at 48 V and 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. Motor horsepower rating: 7.5 hp at 230 V.