Siemens 3RT2035-1AC20NDA Three-Phase Contactor

Siemens 3RT2035-1AC20NDA is a three-pole Sirius power contactor designed for AC-3e/AC-3 motor switching, rated to carry up to 41 A and to drive motors up to 18.5 kW at 400 V with a 24 V AC coil (50/60 Hz). Main contacts are rated for insulation up to 690 V, and the device includes an integrated auxiliary contact set of 1 NO + 1 NC, with screw-terminal connections for secure wiring on both main and auxiliary circuits. The unit sits in size class S2 and weighs about 0.988–0.99 kg, offering robust mechanical life typically around 10,000,000 cycles for the base contactor (with variations depending on auxiliary block configurations). This combination makes it a compact, durable choice for panel-mounted motor control in industrial equipment, conveyors, and pumps where 3-phase switching at 24 V control voltage is required.