Siemens 3TY7403-0AC1 Magnet Coil For Contactors And Starters 24V 60Hz 20V 50Hz

Siemens 3TY7403-0AC1 magnet coil energizes the magnet in Siemens contactors and starters, delivering 24 V AC at 60 Hz or 20 V AC at 50 Hz to actuate the armature. The dual‑voltage design accommodates different regional power standards, making it suitable for mixed voltage environments common in industrial automation. Siemens documentation associates this style of coil with magnet assemblies found in several classic coil families, including 3TF30–33, 3TF40–43, 3TH3, 3TH4, 3TB40–44, 3TC44, and 3TH8, enabling it to serve as a versatile replacement coil across multiple legacy devices. As a coil replacement, the 3TY7403-0AC1 is intended to energize the contactor’s magnet when the rated voltage is applied, triggering the lift of the armature to close or open the power contacts. Typical applications include control cabinets and industrial automation setups where Siemens contactors control motors, conveyors, pumps, and other loads. Confirm that the installed coil’s voltage and frequency match the control circuit (24 V AC at 60 Hz or 20 V AC at 50 Hz) and that the target device model falls within the listed compatible families.