Siemens 3RT1044-3BB40 Three-Phase Power Contactor

Siemens 3RT1044-3BB40 is a three-pole Sirius power contactor designed to switch three-phase loads in motor-control circuits. It is rated for AC-3 operation, carrying up to 65 A and handling up to 30 kW at 400 V, making it suitable for starting and stopping medium-sized motors. The coil operates at 24 V DC, allowing control from a PLC or control cabinet, and the device comes in a Size S3 housing with spring-type terminals for secure, vibration‑resistant wiring. This 3-pole main circuit arrangement is a common choice for industrial motor control, typically used in automated panels and equipment where reliable switching of three-phase power is required. As part of the Siemens Sirius family, the 3RT1044-3BB40 is built for robust electrical endurance and consistent mechanical performance in demanding industrial environments.