Siemens 3RT2045-1AP60 Industrial Three-Phase Power Contactor

The Siemens 3RT2045-1AP60 is a SIRIUS 3RT2 industrial power contactor designed for AC-3e/AC-3 duty, delivering up to 80 A and 37 kW at 400 V across three main normally open contacts. It uses screw terminals and includes one auxiliary contact (1 normally open + 1 normally closed) for signaling and interlocking. The coil is a 240 V AC type rated for 60 Hz operation (the 220 V AC / 50 Hz variant exists in the 3RT2045 family), enabling standard control-circuit compatibility. Coil current draw and power losses are specified around 15.9 W at rated current (5.3 W per pole), with typical no-load losses near 22 W. Isolation between the coil and main contacts is rated up to 690 V, and surge-withstanding values are 8 kV for the main circuit and 6 kV for the auxiliary circuit per EN 60947-1. The device is sized as S3 and is compatible with Siemens’ accessory ecosystem for expanding contact counts or adding protective/monitoring options. This contactor is well suited for switching three-phase motors and other AC-3 loads in equipment such as conveyors, pumps, fans, and machine tools, where reliable motor control and clear signaling are essential.