The Siemens 3RT1017-1BP42 is a SIRIUS S00 power contactor with a 230 V AC coil, screw-type terminals for the main current circuit, and a 45 mm wide housing that snaps onto a 35 mm DIN rail per EN 50022. The S00 frame size keeps it compact at 57.5 mm tall and 72 mm deep, so it fits tight panel layouts where every millimeter counts.
For AC-12 duty (resistive loads like heater banks), it handles up to 10 A maximum operating current. The magnet coil draws 3.3 W both on closing and holding, so the thermal load on the control transformer is predictable — no inrush spike to size for.
Short-circuit coordination and wiring
The screw terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or up to 2x (0.75 to 4 mm²) — solid or stranded — and AWG equivalents from 2x 20 to 1x 12.