Siemens SIRIUS 3RT6024-1BF40 — 110 V Coil Power Contactor, Size S0
Rated for AC-3 duty up to 690 V, it delivers 23 kW at 400 V and 40 kW at 690 V, both at 60 °C — so it handles a 30 kW motor on a 400 V line without derating, as long as the ambient stays under 60 °C. The 45 mm width and 107 mm depth let it fit standard 35 mm DIN rail (DIN EN 50022) with screw and snap-on mounting, and you can rotate it ±180° on a vertical surface or tilt it ±22.5° forward or backward — useful when you're squeezing it into a tight gland plate layout.
The size S0 footprint (45 x 85 x 107 mm) leaves room for side-by-side mounting without gaps — useful when you're packing multiple contactors into a row. Screw-type terminals on both the main and auxiliary/control circuits accept 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²) — strip length and ferrule sizing follow standard practice for this terminal class. The auxiliary switch extension (product extension auxiliary switch: yes) means you can add a front-mount block for feedback or interlocking without changing the contactor's footprint.
AC-3 switching frequency maxes at 1 000 cycles per hour; AC-4 (plugging/reversing) drops to 300 cycles per hour — if your application does frequent inching or reversing, that 300 cycles/h limit governs the mechanical life of 10 million operations typical. The coil draws 6 A at 24 V, 1 A at 110 V, and 0.3 A at 220 V — so a 24 VDC control supply needs to budget 6 A per contactor during pickup, plus holding current. Rated insulation voltage is 690 V, pollution degree 3, and the operating temperature range is -25 to +60 °C — storage extends from -55 to +80 °C, which is the handling limit, not the running limit.