Square D 8903SMG11V04 Lightning Contactor

Square D 8903SMG11V04 Lightning Contactor is a 30 A, 3-pole, NEMA 1 indoor lighting contactor with a 277 VAC coil that is mechanically held for latched operation. Designed for automatic or remote control of lighting circuits, it enables reliable switching of high-current lighting loads and can be integrated with compatible control equipment and field wiring in commercial environments. The NEMA 1 enclosure supports indoor use, and the mechanically held configuration allows the contactor to retain its state between control pulses without continuous coil power. Common applications include turning on and off large lighting banks in warehouses, offices, and other facilities that run 277 V lighting circuits, often controlled by relays, timers, or centralized panels. As a Square D product (Schneider Electric), it belongs to the 8903 family, which is designed for robust mechanical control and compatibility with a range of pilot devices and control accessories for straightforward installation in standard electrical panels and switchgear.