The Siemens SIRIUS 3RT2045-3NB34-3MA0 is a Size S3 power contactor rated for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. At 198 mm deep and 70 mm wide, this frame fits standard S3 panel cutouts. The solid wire range is 2.5 to 16 mm², and stranded accepts 6 to 70 mm² — enough for the main power legs on a moderate motor circuit.
Mounting position allows +/-180° rotation on a vertical surface and can be tilted forward/backward by +/-22.5° — useful when the panel layout is tight and you need to angle the contactor to clear a busbar or duct. Clearances: 10 mm upwards, 10 mm downwards, 20 mm forwards, 10 mm at the side. Coil inrush peaks at 6.5 A; steady-state draw at 50/60 Hz is 3.5 VA. The spring-type coil terminal accepts 2x (0.5 to 2.5 mm²) solid or stranded — standard control wiring.