The Siemens 3RT2017-4LB42 is a SIRIUS coupling contactor in size S00, built for switching loads in control panels where you need a compact, reliable interface between logic-level signals and power circuits. Its 24 VDC coil pulls in at 0.7 of rated voltage and drops out cleanly; the 10 A rated operational current at 24 V covers typical pilot-duty and small motor loads. The ring cable lug connection on the coil saves a wiring step if you're already using ring terminals in the panel.
Mounting and fit
The 45 mm width and 58 mm height keep it in the standard S00 footprint — fits alongside other SIRIUS S00 devices without crowding.
Switching performance and duty
Rated for 1 000 switching cycles per hour at AC-1 (resistive loads), 750 at AC-2 and AC-3 (motor starting/running), and 250 at AC-4 (plugging/inching). The AC-3e rating also sits at 750 cycles/h. Arcing time runs 10–15 ms; DC operating time is 7–20 ms. These numbers tell you it's built for moderate-speed cycling — fine for conveyor controls, pump starts, and general machine switching, but not for high-speed servo or welding applications.
Environmental range
The storage range is wider — it'll survive a cold warehouse or hot shipping container, but running it above 60 °C requires derating per the thermal curve. No IP rating is listed, so it's intended for clean, dry enclosure environments, not washdown.