Siemens SIRIUS 3RT1024-1AM20 is a power contactor in the S0 frame size, rated 5.5 kW at 400 V AC-2 duty and 12.5 A at 400 V AC-4. It mounts on 35 mm DIN rail per DIN EN 50022 via screw or snap-on, with screw-type terminals for the main current circuit.
Panel integration is straightforward: the 45 mm wide, 85 mm tall, 91 mm deep body clips onto standard 35 mm rail. Side-by-side mounting is allowed with 6 mm clearance at the side; front face carries IP20 protection, terminal area is IP00. Wire sizes for the main circuit accept 2x (1–2.5 mm²), 2x (2.5–6 mm²), or max 2x 10 mm² stranded, with AWG equivalents 2x (16–12), 2x (14–10), or 1x 8.
Compared to the smaller-frame 3RT1016-1AG61, the S0 frame of this contactor supports higher motor ratings — 5.5 kW at 400 V AC-2 versus the 1016's lower current class. The 3RT1024-1AM20 shares the same DIN-rail footprint and terminal style as the 3RT1023-1AL20, but the 1024 carries a higher AC-4 current rating (12.5 A vs the 1023's lower figure), making it a better fit for frequent switching or reversing applications.