The Siemens 3RT2327-2AC20 is a SIRIUS contactor in the size S0 frame, built for switching motor loads in control panels. The AC coil is rated at 24 V for both 50 Hz and 60 Hz supply, so it drops straight into a panel with a 24 V control transformer. Screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715 keeps installation quick — no adapter plates needed for a standard enclosure backplate.
Ratings & Fit
The main contact set is 3-pole normally open. An auxiliary switch is included, configurable as 1 NO + 1 NC (the 18...8 notation means 18 terminals for the NO block, 8 for the NC). The auxiliary contacts carry 10 A at 24 V, 10 A at 230 V, and 3 A at 400 V — enough for pilot duty on PLC inputs or relay coils. Mechanical life is rated at 10,000,000 operations typical, which suits high-cycle applications like conveyor diverters or packaging machinery. Operating temperature range is -25 to +60 °C during operation, storage from -55 to +80 °C. The mounting position is flexible: +/-180° rotation on a vertical surface and +/-22.5° tilt forward/backward, so it fits odd panel orientations without derating.
Wiring & Integration
Main circuit terminals accept solid conductors 2x (0.5...2.5 mm²) or stranded 1...10 mm². The magnet coil uses spring-type terminals for fast wiring without re-torquing. Dimensions are 60 mm wide, 102 mm high, 97 mm deep. Clearance spacing: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. Operating time is 4...16 ms AC; arcing time is 10...10 ms. The size S0 frame means it occupies the same footprint as other S0 accessories like auxiliary contact blocks and surge suppressors.
Sourcing & Lifecycle
This part carries a current lifecycle stage from the manufacturer, meaning it remains in the active catalog for new designs and replacement orders. Sourced and quoted to order through independent distribution — availability and current pricing confirmed at quote time. The SIRIUS series is widely stocked, so RFQ turnaround is typically fast.