The Siemens 3RT2327-1AL20 is a SIRIUS contactor in the Size S0 frame, built for switching motor loads and resistive circuits in control panels. It carries a 230 VAC coil rated at both 50 Hz and 60 Hz, with screw-type terminals on the magnet coil — no push-on or faston connectors, so you're wiring it with ring or fork lugs. The contactor mounts via screw or snap-on onto standard 35 mm DIN rail per DIN EN 60715, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward/backward, which gives flexibility when fitting into tight gland-plate layouts.
What the ratings mean for your panel
The Size S0 frame (85 mm high, 60 mm wide, 97 mm deep) is the mid-range footprint in the SIRIUS contactor family — bigger than S00, smaller than S2. That 97 mm depth means it'll clear most 120 mm deep enclosures, but check your gland plate clearance if you're running wires behind the rail. The coil draws 0.25 A at 50 Hz and 0.28 A at 60 Hz — not a heavy pull, but if you're powering multiple contactors from a single 24 VDC supply (through a converter), those 60 Hz inrush numbers add up. Operating range is -25 to +60 °C, which covers most indoor panel environments but derate if you're near a furnace line or in a sun-baked cabinet. The auxiliary switch is built in (yes, it comes with one), and the main contacts accept solid or stranded wire: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) for the control circuit, and 1 to 10 mm² stranded for the power circuit. That's enough for motor loads up to maybe 5.5 kW at 400 V depending on duty, but the exact rating depends on your utilization category — the evidence shows the AC-1 resistive current at various voltages. For a 24 VDC load, it's rated 10 A; at 230 VAC it's 10 A; at 400 VAC it drops to 3 A. That's the thermal current, not the motor-breaking current, so match it to your load type.
Clearance distances: allow 10 mm upwards, 10 mm downwards, 10 mm forwards, and 6 mm at the sides for arc flash and heat dissipation. The arcing time is listed at 10 to 10 ms — tight and consistent, which helps with coordination in a motor control center. Storage temperature range is -55 to +80 °C, so it can sit in a cold warehouse or a hot shipping container without damage.