What it is and where it fits
The Siemens SIRIUS 3RT2018-2XB41-0LA2 is a size S00 power contactor with a DC coil rated 24-34 V. It switches main contacts rated 20-12 A and includes an auxiliary switch. The spring-type coil terminals accept solid conductors: 2x (0.5-1.5 mm²), 2x (0.75-2.5 mm²), and 2x 4 mm². It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022.
DC switching capacity — what the ratings mean
The DC coil draws a 2.3 A inrush peak and holds at 24-34 V. Switching capacity varies by voltage: 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, 3 A at 400 V, 0.2 A at 440 V, 14 A at 480 V, and 2 A at 500 V (-). The 14 A at 480 V is the highest DC rating — that's the figure to size against for 480 VDC loads. At 24 VDC, the 10 A rating covers most control-circuit and small-motor applications.
Panel integration and clearances
The 45 mm wide, 70 mm tall, 73 mm deep footprint fits standard DIN-rail enclosures. Required clearances: 10 mm upward, 10 mm forward, 10 mm downward, 6 mm at the side. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward. Operating temperature -40 to +70 °C; storage -55 to +80 °C.