What this contactor is and where it fits
The Siemens SIRIUS 3RT2026-2BB44-3MA0 is a size S0 power contactor with a 24 V DC coil and spring-type terminals, designed for switching motor loads in control panels. 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 gland-plate layouts or existing busbar arrangements. The 45 mm width and 102 mm height keep it within the standard S0 footprint; the 154 mm depth is the dimension to watch when planning enclosure depth against the backplane.
Key ratings and what they mean for your BOM
The 24 V DC coil pulls 6 A at rated voltage, with a pickup dropout range of 0.8 to 1.1 times the rated value — so the coil holds reliably down to about 19.2 V and drops out below 18 V. The contactor is rated for AC-3 duty at 750 operations per hour, which covers standard squirrel-cage motor starting; AC-4 duty (plugging/inching) is limited to 250 ops/h. No built-in auxiliary switch, so if you need N.O./N.C. feedback for a PLC or safety circuit, you'll add a side-mount block. The main contact wire range accepts solid or stranded 1–10 mm², with a separate pair of terminals for 2x (0.5–2.5 mm²) — enough for the coil and auxiliary wiring without doubling up on the power terminals.