The Siemens 3RT7026-1AC25 is a SIRIUS size S0 contactor with a 24 V AC 50/60 Hz coil, three main NO poles, and screw-type terminals on both the main and auxiliary circuits.
The AC-3 rated operational current at 230 V is 6 A, dropping to 3 A at 400 V and 1 A at 690 V. That means this contactor is sized for smaller motor loads — think fractional-horsepower pumps, fans, or conveyor drives — not for high-current main feeders. The maximum switching rate at AC-3 is 800 operations per hour, which is comfortable for cyclic applications like packaging machinery or HVAC damper control; the AC-4 rate of 250 operations per hour reflects the heavier wear of inching or plugging duty. The coil draws 0.24 A at both 50 Hz and 60 Hz, with a holding power of 0.24 W DC and a closing power of 0.72 W DC. That low holding power keeps the control transformer lightly loaded — useful when multiple contactors share a single 24 V AC supply.
The S0 footprint — 55 mm wide, 85.5 mm tall, 91 mm deep — fits the standard S0 slot in a Siemens panel layout.