Siemens 3RT1035-1A Contactor

Siemens Sirius 3RT1035-1A is a three‑pole power contactor designed for AC‑3 motor control up to 40 A, delivering 18.5 kW at 400 V when switching three‑phase loads at standard 50/60 Hz. This Size S2 device uses screw terminals for secure wiring and is intended for three‑pole operation, making it suitable for motors and other inductive loads in industrial automation. The unit is rated for AC‑3 service at 40 A and, in AC‑1 service, up to 60 A, enabling it to handle a range of motor starting and supervisory duties beyond pure motor starting in compatible circuits. It is part of Siemens’ Sirius 3RT family, with the 3RT2 as its modern successor, and is commonly offered in variants configured for different coil voltages and connection options depending on the exact model. For your installation, verify the coil voltage and terminal configuration on your specific 3RT1035‑1A variant to ensure compatibility with your control circuit and wiring scheme.