Siemens AG 3TF44 22-0A Three-Phase AC Contactor

The Siemens 3TF44 22-0A is a three-pole AC contactor from the Sirius 3TF family, designed to switch three-phase loads in industrial control circuits. It uses a 110/120 VAC control coil (110 V at 50 Hz or 120 V at 60 Hz) and carries a 32 A (AC-3) rating, with mains voltages up to 690 V, which aligns with a horsepower range of about 31 HP at 690 V for typical loads. This configuration includes two normally open and two normally closed auxiliary contacts, enabling basic signaling and interlocking within starter circuits. Catalog references often list the model as 3TF4422-0A, underscoring its compatibility with Siemens 3TF installations and, in some cases, its role as a direct substitute for the original 3TF44 in legacy equipment. The compact 3P design makes it suitable for motor-control duties such as conveyors, pumps, and processing lines, where reliable isolation, predictable actuation, and compatibility with standard control panels are important.