The Square D 8903SM03 is a lighting contactor used in electrical control systems to switch and control lighting circuits and other loads. It is part of the Square D Type S series of contactors and is designed to handle commercial and industrial lighting applications. The device uses an electrically energized coil to close electrical contacts that allow current to flow to the controlled circuits. Once the coil is energized, the contacts remain closed, enabling the load to stay powered. It is typically installed in electrical panels where remote or automated switching of lighting circuits is needed.
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