Square D 8903SMO1 Lighting Contactor Enclosure

Square D 8903SMO1 Lighting Contactor Enclosure is a Type S, electrically held, multipole lighting contactor designed for control of lighting loads inside commercial and industrial panels. This two-pole device is rated for 30 A and uses a 110/120 V AC coil that operates at 50/60 Hz, making it compatible with standard building-control voltages. It uses an open enclosure configuration, intended for mounting inside a panel or cabinet without a separate door, and the variant is listed as Trade Agreements Act (TAA) compliant for U.S. procurement. As part of the 8903 family, the 8903SMO1 provides reliable switching for lighting circuits with a compact footprint suitable for space-constrained enclosures. Common applications include interior and exterior lighting control in offices, retail spaces, and other commercial environments where a maintained-contact lighting controller is needed. The two-pole, 30 A design supports switching of two separate conductors or a single double-throw arrangement, and it integrates with Square D accessories and control systems to form a cohesive lighting control solution.