What this contactor is and where it lands
The Siemens 3RT2027-1AR60 is a SIRIUS power contactor in the S0 frame size, designed for switching motor loads and resistive circuits in control panels. It mounts on a 35 mm DIN rail per DIN EN 60715, with screw and snap-on fastening, and accepts solid or stranded conductors from 1 to 10 mm² on the main contacts.
Key ratings and what they mean for fit
The 24 VDC coil draws 0.25 A at 50 Hz and 0.28 A at 60 Hz — a standard control-voltage draw that a 24 VDC power supply sized for a few contactors handles without issue. The auxiliary contact block carries 10 A at 24 V, derating to 3 A at 400 V and 0.6 A at 440 V, so it handles pilot-duty loads (PLC inputs, small relays) across a wide voltage range. Switching frequency tops out at 1000 operations per hour for AC-1 resistive loads, 750 ops/h for AC-3 motor switching, and 250 ops/h for AC-4 plugging/inching duty. That means it cycles a motor start every 4.8 seconds at full AC-3 rate — fine for a conveyor or pump station, but not for a high-speed pick-and-place cell. Mechanical endurance is rated at 10 million typical operations, so the contactor outlasts the panel in most fixed-speed motor applications. Operating temperature spans -25 to +60 °C, with storage down to -55 °C. Mounting position is flexible: ±180° rotation on a vertical surface, plus ±22.5° tilt forward/backward.
Panel integration and wiring
The S0 frame measures 85 mm high × 45 mm wide × 97 mm deep. Clearance distances: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. That 97 mm depth means it fits a standard 200 mm deep enclosure with room for wiring ducts. Main contacts accept 1–10 mm² solid or stranded; auxiliary contacts accept 2×(0.5–1.5 mm²) or 2×(0.75–2.5 mm²). Coil terminals are screw-type.