Siemens SIRIUS 3RT2023-1AN20 — Power Contactor, Size S0
It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows +/-180° rotation on a vertical surface, plus +/-22.5° tilt forward/backward — useful when fitting into tight enclosures where the rail orientation isn't ideal. The contactor is rated for 10 A at 24 V, 3 A at 400 V, and 1 hp at 230 V — these are the switching current values for the main contacts under the respective voltage conditions, so size the load circuit accordingly.
The 3RT2023-1AN20 measures 45 mm wide, 85 mm high, and 97 mm deep — a compact S0 footprint that fits standard DIN-rail enclosures without crowding adjacent devices. Main contact terminals accept solid or stranded conductors from 1 to 10 mm²; auxiliary terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) — match your wire gauge to the lug range before terminating.
Switching Performance and Lifecycle
Maximum switching frequency is 1,000 operations per hour for AC-1, AC-2, AC-3, and AC-3e duty; drops to 300 ops/h for AC-4 (plugging/reversing) — the heavier the load profile, the more thermal recovery time the contactor needs between cycles. Switching time at AC is 4 to 16 ms; arcing time is 10 ms — these numbers matter for coordinating with upstream protection devices and for timing sequences in multi-contactor circuits. Power loss is 0.25 W at 50 Hz and 0.28 W at 60 Hz — negligible for panel heat budget, but worth noting if you're stacking dozens of these in a sealed cabinet.