Schneider Electric 1707-S1-T21 Contactor Coil

Schneider Electric's Square D 1707-S1-T21 coil is a replacement magnet coil for the 1707-S1 contactor, designed to energize the contactor when supplied with 120 V AC at 60 Hz or 110 V AC at 50 Hz. It is intended for use with the 1707-S1 motor starter family, providing the electrical signal that pulls in the coil to close the main contacts and start the connected load. Typical applications include motor control in conveyors, pumps, fans, and general HVAC and process equipment where remote switching of higher-current circuits is required. The 1707-S1-T21 designation identifies this coil version as a genuine Square D/Schneider Electric replacement part, suitable for maintenance or retrofit when a coil fails or for stocking in service inventories. Install with proper overcurrent protection and in accordance with applicable electrical codes, ensuring compatibility with the existing control voltage distribution. When energized at its rated voltage, the coil actuates the magnetic core to move the contactor’s armature, enabling power delivery to the connected equipment.