Square D 40440-300-51 Contactor Coil

The Square D 40440-300-51 (40440-300-51) is a replacement contactor coil engineered for industrial motor control assemblies and contactor systems. Operating as an electromagnetic actuator within compatible contactors and starters, this coil generates the magnetic field necessary to pull the armature and close the electrical power contacts, establishing safe and reliable circuit switching under operational loads. When de-energized, it allows the spring mechanism to open the contacts rapidly, effectively interrupting the circuit and protecting downstream machinery. Built for dependable performance in demanding electrical control panels, the 40440-300-51 helps restore optimal switching capabilities during routine maintenance, scheduled overhauls, or unexpected coil burnout. With a net weight of 10 kg, this replacement coil maintains solid mechanical and electrical connection within industrial switchgear and motor starters. Incorporating this component into preventive maintenance programs minimizes system downtime, enhances electrical safety, and preserves operational continuity across manufacturing, processing, and automation facilities. Verify equipment specifications and existing contactor ratings before installation.