SIRIUS S2 Power Contactor — 22 kW at 500 V
The Siemens 3RT1035-1AR60-ZX95 is a SIRIUS-brand power contactor in size S2, rated for 22 kW at 500 V in AC-3 duty — the motor-switching rating that governs real-world use on pumps, fans, and compressors. Screw-type terminals on the main circuit accept solid conductors up to 2x 4 mm² and stranded up to 2x 25 mm², so it handles standard panel wiring without lug adapters. Snap-on mounting onto 35 mm DIN rail per EN 50022, with side-by-side mounting permitted — no gap needed between contactors in a multi-contactor motor control center. Rated for 50/60 Hz, 400 V at 50 Hz and 400–440 V at 60 Hz, with operating range of 0.8–1.1× rated voltage at 50 Hz and 0.85–1.1× at 60 Hz.
Mechanical and Electrical Endurance
Typical mechanical life is 10 million operations — the figure that tells you this contactor is built for high-cycle applications like conveyor lines or packaging machines where the contactor cycles every few seconds. Maximum switching frequency varies by duty: 1200 operations/hour in AC-1 (resistive loads), 1000 in AC-3 (motors), 600 in AC-2 (slip-ring motors), and 300 in AC-4 (plugging/inching). The AC-3 rate of 1000 ops/hour is the one to size against for standard motor starting. Arcing time is 10–15 ms, and AC arcing time is 7–20 ms — both within the range for standard motor starter coordination with upstream fuses or circuit breakers.
Environmental and Installation
IP20 on the front (touch-safe when mounted in an enclosure), IP00 at the terminals — so the contactor is designed for installation inside a panel, not exposed. Pollution degree 3 means it tolerates conductive dust and humidity typical of industrial control rooms. Operating temperature range -25 to +60 °C, storage -55 to +80 °C. The storage range matters if you're holding this as a critical spare in an unheated warehouse — it survives the cold, but don't run it below -25 °C. Dimensions: 112 mm height, 55 mm width, 115 mm depth — the 55 mm width is the key panel-space figure; it occupies a single 55 mm slot on a DIN rail, allowing dense packing.
Coil and Auxiliary Ratings
Auxiliary contact ratings at various voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. These are the switching capacities for the built-in auxiliary contacts — useful for interlocking or status feedback to a PLC. Rated for 18.5 kW at 400 V in AC-2 duty (slip-ring motor starting), and 11.4 kW at 690 V — the 690 V figure is relevant for 690 V line supplies common in mining or marine installations.