AC-1 Contactor for Resistive and Weak-Inductive Loads
The Siemens 3RT2446-6AV66 is a SIRIUS 3RT.4 contactor sized for AC-1 duty — resistive heating elements, lighting banks, and lightly inductive loads where inrush is minimal. Its 140 A rating at 690 V / 40 °C defines the continuous current it can carry in open air; derate when enclosed or ganged on a DIN rail. The 3-pole main circuit terminates via ring cable lugs, while the control and auxiliary circuits use screw terminals — a mix that suits panel builds where power wiring runs larger conductors and control wiring stays at smaller gauges.
Coil and Auxiliary Configuration
Pickup and dropout voltages follow the IEC 60947-4-1 standard curve; expect pickup at roughly 85 % of rated voltage and dropout below 20 %. The auxiliary contact block ships with 2 NO + 2 NC, giving you one spare contact pair after wiring a three-wire start/stop circuit. Size S3 frame means the contactor occupies a defined footprint on the DIN rail — verify clearance for the ring-lug terminals before laying out adjacent devices.
RoHS compliant since 16-05-19. REACH Article 33 information is available on request. The product family carries CE and UL/CSA approvals typical for SIRIUS contactors; verify the specific UL file number against your panel UL 508A listing if required.