Schneider Electric 3107440057U Electrical Contactor

Schneider Electric's Square D 3107440057U is a replacement magnetic coil designed for NEMA Size 3 contactors. The coil is rated for 440/480V AC, making it suitable for standard industrial control circuits that operate on 480V nominal supply. As a standalone coil assembly, it replaces worn or burnt coils in compatible Square D contactors, allowing continued control of three-phase motors and equipment such as conveyors, pumps, and fans. The 3107440057U code identifies the coil itself, not a complete starter; it should be installed only with a compatible Square D contactor housing. The coil's compact form and standard mounting pattern align with typical Size 3 units, enabling straightforward retrofits or repairs in existing panels. When wiring, ensure control voltage matches the 440/480V AC rating, observe proper safety procedures, and verify that the receiving contactor is a compatible 3-pole Square D device. This coil is part of Square D's legacy line under Schneider Electric, offering a readily available replacement option to maintain motor control reliability in industrial facilities that use 480V control circuits.