Contactor selection brief
The Siemens SIRIUS 3RT1017-2AV02-1AA0 is a size S00 power contactor rated for 400 V at 50/60 Hz, delivering 5.5 kW at 400 V under AC-3 duty. This is the rating that governs motor switching — the AC-3 figure, not the AC-1 resistive current, is what you size against for standard induction motor loads. At 690 V it also carries 5.5 kW, so the contactor is voltage-limited, not power-limited, at the higher rail. If your application cycles through AC-4 frequently, that 8.5 A figure is the hard limit, not the AC-3 power rating. The 45 mm width (three 15 mm modules) is the S00 footprint — no surprises for panel fill factor.
Main current circuit terminals are spring-loaded, accepting 2x (0.25 to 2.5 mm²) solid or stranded, or 2x (24 to 14 AWG). That's a standard range for control panel wiring up to the rated current. No screw torque to verify, which saves time on repetitive terminations.
This is the selectivity data a panel designer needs for the short-circuit rating of the branch. That covers most industrial control panels without forced cooling, but verify if ambient regularly exceeds 60 °C. Above that, dielectric strength and air circulation drop — not a concern for most sites, but worth noting for high-altitude installations.
That's the mechanical life — electrical life will be lower depending on the switching load (AC-3 vs AC-4, current magnitude).