SIRIUS S0 Power Contactor — 3RT2027-4AR60
The Siemens 3RT2027-4AR60 is a SIRIUS S0 power contactor, 45 mm wide and 97 mm deep, built for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. The S0 frame size fits standard panel layouts with a 45 mm width slot — no extra DIN rail space needed beyond that. Operating range covers -25 to +60 °C, so it handles warm cabinet environments without derating concerns at the top end. Switching frequency maxes at 750 1/h under AC-3 and AC-2, and 1 000 1/h under AC-1 resistive loads — enough for conveyor start-stop cycles or pump control without overheating the coil.
DIN-rail snap-on plus screw fastening gives you a choice: clip it on or bolt it down. Clearance around the contactor is 10 mm upward, forward, and downward, with 6 mm at the sides. That 6 mm side gap is tight — adjacent devices on the same rail need that spacing for arc flash and heat dissipation.
Auxiliary & Coil Connections
An auxiliary switch is built in, and the magnet coil terminates via ring cable lug connection — that means you need ring terminals on the control wiring, not just ferrules. The auxiliary contact ratings span from 10 A at 24 V down to 0.3 A at 220 V and 0.6 A at 440 V, covering standard PLC output signals and relay logic.