The Siemens SIRIUS 3RT2017-1QB42 is a size S00 coupling contactor with a 24 VDC coil, rated 10 A at 24 V and 3 A at 400 V. No built-in auxiliary switch — plan for a separate auxiliary contact block if feedback is needed.
Depth is 117 mm, height 58 mm.
Switching performance and thermal limits
Rated switching frequency varies by duty: 1000 ops/h at AC-1 (resistive), 750 ops/h at AC-2 and AC-3 (motor starting), 250 ops/h at AC-4 (plugging/inching). Coil inrush is 1.25× rated, holding at 0.7×.
