Siemens SIRIUS 3RT7026-1AL25 — 3-Pole Power Contactor, Size S0
Mounting is via screw and snap-on onto 35 mm DIN rail per DIN EN 50022, with ±180° rotation and ±22.5° tilt allowed on vertical surfaces — useful for tight enclosure layouts. Coil consumption is 0.72 W during pick-up and 0.24 W holding at DC — low enough to keep heat rise minimal in a crowded DIN rail row. The screw-type terminals on both main and auxiliary circuits accept 2x (0.5 to 2.5 mm²) solid or finely stranded wire with ferrules, matching common panel-wiring practice.
AC-3 Motor Switching and Coordination
For motor starting duty (AC-3), the contactor is rated at 690 V maximum, with a rated operational current that depends on the applied voltage: 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. These values determine the maximum induction motor current it can switch under Category AC-3 — the load governs which column applies. The switching frequency is 800 operations per hour for AC-3 and AC-3e, dropping to 250 per hour for AC-4 (plugging/inching) duty. The impulse withstand voltage is 6 kV, and the pollution degree is 3 (controlled environment, not sealed).
Dimensions, Mounting, and Auxiliary Options
The S0 frame occupies 55 mm width, 85.5 mm height, and 91 mm depth — a standard footprint for this size class. The product accepts auxiliary switch blocks as a field-addable extension, so a single catalog number covers the base contactor and you add the aux contacts separately.