The Siemens SIRIUS 3RT2023-1AL20-1AA0 is a Size S0 power contactor with a 24 VDC coil, screw-type terminals, and an integrated auxiliary switch. Rated for continuous operation from -25 °C to +60 °C and storage from -55 °C to +80 °C, it handles the thermal range of most industrial enclosures without derating concerns.
At 400 V the main contacts are rated 3 A; this is the AC-1 resistive load curve — for motor loads (AC-3) the actual switching current will be lower, governed by the contactor's utilization category.
The 45 mm width and 97 mm depth fit the standard S0 footprint. Mounting position is standing on a horizontal surface; clearance requirements are 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the sides — tight enough for dense panel layouts.