What it is and where it lands
The Siemens 3RT1026-3XB44-0LA2 is a SIRIUS power contactor in the S0 frame size, built for switching motor loads in industrial control panels. It carries a 24 VDC coil and uses screw-type terminals on the main circuit. The contactor snaps onto a 35 mm DIN rail per DIN EN 50022, so it integrates into standard panel layouts without extra bracketry.
What the ratings mean for your BOM
The 24 VDC coil draws 10 A at 24 V rated value, dropping to 2 A at 60 V and 1 A at 110 V — that tells you the control-circuit power supply needs to handle the inrush. For motor loads, the contactor is rated 3 hp at 230 V, 7.5 hp at 200/208 V, 7.5 hp at 220/230 V, 15 hp at 460/480 V, and 20 hp at 575/600 V. At 400 V it switches 3 A in AC-4 duty (15.5 A), meaning it handles the high-stress reversing or inching cycles where the contacts break full motor current. The 11 kW rating at both 500 V and 690 V covers European-standard motor sizes in those voltage classes.
Mounting and clearances
The contactor measures 45 mm wide, 119 mm tall, and 150 mm deep. It mounts via screw or snap-on onto a 35 mm DIN rail. Side-by-side mounting is allowed, so you can gang multiple units without spacing. Minimum clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 10 mm at the side. The front face carries an IP20 rating (finger-safe), while the terminals themselves are IP00 — meaning the wiring compartment is open and needs enclosure protection in dusty or wet environments.