What this contactor is and what it does
The Siemens 3RT1035-1AK60-ZX95 is a SIRIUS power contactor in the Size S2 frame, designed for switching motor loads and resistive loads in industrial control panels. It carries a 22 kW rating at 500 V and 11.4 kW at 690 V, with an AC-2 motor rating of 18.5 kW at 400 V — figures that tell you it handles medium-horsepower induction motors on 400 V to 690 V three-phase systems. The screw-type terminals accept solid conductors up to 2x 4 mm² or stranded up to 2x 25 mm², so it mates directly to standard motor-circuit wiring without lug adapters.
Mounting and panel integration
Snap-on mounting onto 35 mm DIN rail per EN 50022, with screw-fastening as a backup. The 55 mm width and 112 mm height fit a standard S2 footprint; side-by-side mounting is allowed, so you can gang multiple contactors on the same rail without derating for heat buildup. The front face carries an IP20 rating — safe for finger-probe access inside a closed panel — while the terminal area is IP00, meaning the wiring compartment expects enclosure protection.
What the ratings mean for your application
The AC-1 maximum switching rate of 1,200 operations per hour applies to resistive loads (heaters, lighting); AC-3 drops to 1,000 ops/h for standard squirrel-cage motor starting; AC-4 (plugging/inching) is limited to 300 ops/h. Mechanical life is rated at 10 million operations — the contactor will outlast most machines if the electrical load stays within its AC-3 curve. Operating temperature spans -25 °C to +60 °C, with storage from -55 °C to +80 °C. Pollution degree 3 means it tolerates conductive dust and occasional condensation, typical for industrial enclosures not in clean-room environments.