Siemens SIRIUS 3RT2018-2XF41-0LA2 — DC-Coil Power Contactor, Size S00
The Siemens 3RT2018-2XF41-0LA2 is a SIRIUS power contactor in size S00, designed for switching motor and resistive loads in industrial control panels. Its DC coil is rated for 72 to 125 VDC, with a pickup threshold of 0.7 times the rated value and dropout timing of 25 to 45 ms. The coil termination uses spring-type terminals, which eliminate the need for periodic re-torquing common with screw clamps. The contactor mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022, with a 45 mm width that occupies a single DIN module. The envelope dimensions — 45 mm wide, 70 mm high, 73 mm deep — fit standard panel layouts. Clearance requirements are 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm at the sides.
Main Contact Ratings and Switching Capacity
The main contacts are rated for AC-4 duty at 20 to 12 A depending on the operating conditions, with a maximum switching frequency of 250 operations per hour at AC-4. For DC switching, the contactor is rated at 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 0.2 A at 440 V. At 480 V AC, the rating is 14 A. The arcing time is 10 to 15 ms. The contactor includes an auxiliary switch (1 NO + 1 NC configuration per the order code suffix), which allows feedback to the PLC or safety relay without an additional add-on block. The auxiliary contact ratings follow the same DC voltage table as the main contacts.
Environmental and Mounting Flexibility
Operating temperature range is -40 to +70 °C, with storage from -55 to +80 °C. The contactor can be mounted in any orientation: +/-180° rotation on a vertical surface, +/-22.5° tilt forward/backward, or standing on a horizontal surface. This flexibility simplifies panel layout when space is constrained. Solid conductors accepted: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and 2x 4 mm². Stranded conductors: 2x (0.5 to 4 mm²). The spring-type coil terminals accept the same ranges, reducing wiring time compared to screw terminals.