The Siemens SIRIUS 3RT2027-1XF40-0LA2 is a size S0 power contactor with a 110 V DC magnet coil and screw-type terminals, built for switching motor loads in control panels. It includes an integrated auxiliary switch, so you don't need a separate add-on block for basic status feedback. Rated for main contact operation up to 16 to 8 A depending on the load (the DC switching capacity is detailed per voltage below), with a 15 A inrush peak. The DC coil dropout delay spans 30 to 50 ms, and arcing time is a consistent 10 ms. Mechanical life is typical 10 million operations.
DC Switching Capacity by Voltage
At 24 V rated value the contactor switches 10 A; at 48 V and 60 V it handles 2 A each; at 110 V it switches 1 A; at 125 V it switches 0.9 A; and at 220 V it switches 0.3 A. The 230 V rating is expressed as 5 hp, which aligns with motor-duty applications at that voltage level.
Mounting and Clearance
Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715. The mounting position allows +/-180° rotation on a vertical surface and can be tilted forward/backward by +/-22.5° on a vertical mounting surface. Required clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. Dimensions: 85 mm height, 45 mm width, 107 mm depth. Wire capacity for main contacts: solid 2x (1 to 2.5 mm²) or 2x (2.5 to 10 mm²); stranded 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²).